Tiny Machine Basic for the IC51 Single Board Computer

Reference Manual for Version 1.0 and 1.1

Industrologic, Inc.
3201 Highgate Lane
St. Charles, MO
63301
USA

Phone: (636) 723-4000
www.industrologic.com
info@industrologic.com




Trademark and Copyright Information

Tiny Machine Basic and TMB are Trademarks of Industrologic, Inc. 2004
This document is Copyright (c) 2004 by Industrologic, Inc.
All rights reserved.

No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying or scanning, for any purpose other than the personal use by the purchaser of this product. Industrologic, Inc. reserves the right to revise this document at any time without obligation to notify any person of such revision. Industrologic, Inc. assumes no responsibility for any errors that may appear in this document.

Warning/Disclaimer

Whereas effort has been made to make the information in this document as useful and accurate as possible, Industrologic, Inc. assumes no responsibility for the application, usefulness, or completeness, of the information contained herein. Under no circumstance will Industrologic, Inc. be responsible or liable for any damages or losses including indirect or consequential damages or losses arising from either the use of any information contained within this manual or the use of any products or services referenced within this manual.


Overview and General Information

Tiny Machine Basic for the IC51 (TMB-IC51) is a simple BASIC language interpreter with a limited syntax and list of instructions. TMB-IC51 is not so much a high level language like most BASIC interpreters, but is a cross between BASIC and machine language. It has been written specifically for the 8 bit structure of the Intel 8051 instruction set compatible families of microcontrollers, and for program storage in an 8K (8192 byte) serial EEPROM.

A "command" consists of an instruction and its "argument", and will be performed as soon as entered. A program line entry consists of a number from 1 to 2730, a space, an instruction, and a byte or word argument, depending on the instruction type. Byte arguments can be entered as decimal values or quoted single character strings, e.g. "x".

Instructions entered while programming are saved as three-byte tokenized instructions, not as BASIC source code. This allows for up to 2730 program lines. (8192 / 3 = 2730). Instructions that involve line numbers or EEPROM locations will have word (2 byte) arguments. All other instructions will have byte arguments. Instruction arguments that are limited to a single byte (values from 0 to 255) and exceed this limit at run time will "roll over" or "roll under" back to a byte value, and will not cause a run-time error. Similarly, instructions that use a limited range of values and are given values outside that range will not cause a run-time error, but will either ignore the instruction or convert the illegal value to a legal value.

Instructions that manipulate the I/O port bits of the microcontroller must be used in ways that are compatible with the port hardware. If any port bit is to be used as an input, it must be set to a logic level "high" state, or "1". (On power up the port pins are set high.)

Comments may be added to program files created and saved on a host computer and uploaded, but the program saved in the IC51 will not contain comments. Comments must be on separate lines, and any line that does not begin with a program line number may be a comment. When comment lines are sent to the IC51 during program upload, syntax errors occur, and the lines are ignored.


Variables

26 byte variables exist in TMB-IC51 which are represented by the letters A through Z. These variables store byte values that can be read or assigned values by the user program. For certain specific instructions the variables A and B can be treated as a word variable referred to as BA. For these instructions B contains the most significant byte and A the least significant byte.

Although all 26 byte variables are considered general purpose, certain instructions read or write specific variables. The variables that are not used specifically by any instructions are E, F, G, I, J, K, L, O, P, Q, R, T, U, V, X, and Z.

The following is a list of byte variables that can be read and displayed, but cannot be assigned values by the user program. The user program must read KEY, KEY2, and INT often enough to insure that they contain current and valid values.

KEY    the ASCII value of the last character received at Serial
       Port 1 (cleared after being read)
KEY2   the ASCII value of the last character received at Serial
       Port 2 (cleared after being read)
       (See Appendix A for a table of these values)
INT    the number of low going pulses that have occurred at
       the I/O signal INT (cleared after being read)
(A)    a special description of variable A used to display the ASCII
       character rather than the numeric value

Instructions

The following is a list of instructions where, unless otherwise specified, [arg] is an argument to the instruction in the form of a byte variable, number from 0 to 255, or single ASCII character. The command instructions will normally be used only as a command at the prompt, and the rest of the instructions will normally be used within a program, but may be used as a command at the prompt to see how the instruction works.

Command instructions:

BAUD=[arg]     Set baud rate of Serial Port 1 to [arg] times 100, and save in
               EEPROM. Allowable values are 192, 96, 48, 24, 12, 6, 3. (If you
               change the baud rate in TMB-IC51, you will also need to change it
               in your terminal software!)

Example:
BAUD=96        set Serial Port 1 baud rate to 9600


BOOTON         Run your program when TMB-IC51 starts (i.e., on power up)
BOOTOFF        Turn off the BOOTON feature (both are saved in EEPROM)
Note: The BOOTON feature can be overridden by pressing the pushbutton switch SW1 while power is applied to the IC51. TMB-IC51 will then return a prompt at 9600 baud (regardless of the baud rate specified with the BAUD instruction).

NEW            Erase all program lines
LIST           Display the program lines (if there are more than 20 lines the
               listing will pause until you press a key)
RUN            Run the program from the command prompt (>)
END            Stop the program and return to the prompt
The program can be stopped with the END instruction, by having no further lines to execute, (possibly by going to a non-existant line number above the rest of the lines), or by telling the program to go to line zero. If the program does not have a method of exiting in response to some program condition, the power will need to be cycled to return to the prompt.

Control and Program Flow instructions:

DELAY [arg]    Pause the program for [arg] tenths (1/10) of a second
GOTO [arg]     Jump to the instructions beginning at line number [arg]
GOSUB [arg]    Call subroutine at line number [arg] (1 layer deep only)
RETURN         Return to next instruction after the last GOSUB
LOOP [arg]     Begin a loop with [arg] iterations (1 layer deep only)
ENDLOOP        Terminate a loop
Subroutines and loops may only be one layer deep, that is, a subroutine may not contain another GOSUB instruction, and an ENDLOOP instruction must be performed before another LOOP instruction is performed.


Examples:
DELAY 255      delay 25.5 seconds

1 GOSUB 10     call subroutine at line 10
2 GOTO 1       jump to line 1
10 PRINT "A"   send an upper case A to the serial port
11 RETURN      jump to line following the GOSUB instruction

10 GOSUB A     call subroutine at the line number of the value of variable A
               (if the value of A is 20 it would be the same as GOSUB 20)

1 LOOP 255     start a loop of 255
2 PRINT "A"    send an upper case "A" to the serial port
3 ENDLOOP      jump back to line 2 until 255 loops have been done

Display and Keyboard instructions (Serial Port 1):

PRINT [arg]    Display a byte value in decimal/hexadecimal, or as character
               (This instruction sends characters out the serial port)
               See Appendix A for a table of these values

The PRINT instruction does not include a carriage return/line feed sequence (13D/10D or 0DH/0AH) after displaying a value or character like most BASIC languages. If either of these characters are desired they will need to be displayed separately.

Any character that has an ASCII value outside the range of normally displayable characters (32 to 126) can be sent as an ASCII value.

HEX            Display values in hexadecimal (try this at the command prompt)
DECIMAL        Display values in decimal (returns it to normal)
INPUT [arg]    Wait for a value to be entered (followed by a carriage return) and
               then put the value in [arg]. (This instruction waits for characters
               from the serial port). See Appendix A for a table of these values.

The ESCAPE key will cancel value entry with the INPUT instruction, (but not stop the program)


Examples:
PRINT 13       send a carriage return to the serial port
PRINT 10       send a line feed to the serial port
PRINT 27       send the "escape" character to the serial port
PRINT "A"      send an upper case A to the serial port
PRINT "a"      send a lower case A to the serial port
PRINT 97       send a lower case A to the serial port
INPUT A        wait for a value and then set variable A to that value
 
A=66           ASCII code for 'B"
PRINT (A)      send ASCII character "B" to serial port

Variable Manipulation instructions:

BA=[arg]       Set the byte variables A and B to a byte or word value in [arg]

Examples:
BA=10          set variable B to 0 and variable A to 10
BA=1000        set variable B to 3 and variable A to 232


A=[arg]        Set byte variable A to [arg]
A=A+[arg]      Add the value in [arg] to variable A
A=A-[arg]      Subtract the value in [arg] from variable A
A=A*[arg]      Multiply variable A by the value in [arg]
A=A/[arg]      Divide variable A by the value in [arg], (remainder is discarded)
A=A MOD[arg]   Remainder of dividing variable A by the value in [arg]
A=A AND [arg]  Logical AND variable A by the value in [arg]
A=A OR [arg]   Logical OR variable A by the value in [arg]

IF A=0 [arg]   If variable A is zero jump to line number [arg]
IF A<>0 [arg]  If variable A is not zero jump to line number [arg]
IF A=B [arg]   If variable A equals variable B jump to line number [arg]
IF A<>B [arg]  If variable A does not equal variable B jump to line number [arg]
IF A<B [arg}   If variable A is less than variable B jump to line number [arg]
IF A>B [arg]   If variable A is greater than variable B jump to line number [arg]


Examples:
A=KEY          get value of last character at Serial Port 1
B=67           set variable B to the ASCII value for "C", which is 67
IF A=B 30      if character was "C" then jump to line 30

A=A+B          add the value of variable B to variable A
A=A+10         add 10 to variable A (e.g., if A contained 10 it would
               become 20, if A contained 255 it would roll over to 9)
A=A-1          subtract 1 from A (e.g., if A contained 2 it would
               become 1, if A contained 0 it would roll under to 255)
A=A*10         multiply variable A by 10 (e.g., if A contained 10 it would
               become 100, if A contained 30 it would roll over to 44)
A=A/5          divide variable A by 5 (e.g., if A contained 10 it would
               become 2, if A contained 202 it would become 40)
A=A MOD 7      divide variable A by 7 and return the remainder in variable A
               (e.g., if A contained 10 it would become 3, if A contained 21 it
               would become 0)
A=A AND 128    logical AND variable A with 128 [80 hex] (e.g., if A contained 240
               [F0 hex] it would become 128 [80 hex])
               become 128, if A contained 30 it would roll over to 44)
A=A OR 16      logical OR variable A with 16 [10 hex] (e.g., if A contained 128
               [80 hex] it would become 144 [90 hex])

IF A=0 10      if variable A is equal to 0 then jump to line 10
IF A<>0 15     if variable A is not equal to 0 then jump to line 15
IF A<B 20      if variable A is less than variable B then jump to line 20

Serial Port 2 instructions:

Unlike Serial Port 1, which is implemented in hardware in the microcontroller and will always transmit and receive characters correctly, Serial Port 2 is implemented with hardware interrupts and software timing loops, which can be interrupted. If other functions (including other Serial Port 2 functions) cause interrupts when a character is being transmitted or received, the character may not be correct. This type of error is most likely to happen at high baud rates and very unlikely at low baud rates.

BAUD2=[arg]    Set baud rate of Serial Port 2 to [arg] times 100. Allowable values
               are 192, 96, 48, 24, 12, 6, 3. This instruction must be used before
               sending or receiving characters at Serial Port 2.

Example:
BAUD2=3        set Serial Port 1 baud rate to 300

PRINT2 [arg]   Send a byte value out Serial Port 2 in decimal as a character.
               This instruction works just like the PRINT instruction,
               but for Serial Port 2. For formatting details see PRINT.

LCD instructions:

Note: The digital outputs are manipulated by both the digital output instructions and the LCD instructions, which assume an LCD module connected to specific digital output signals.

The LCD instructions, particularly the initialization sequence, involve LCD signal timing and delays, and therefore take a relatively long time to complete compared to other instructions.

LCDCMD=[arg]   Send the command byte [arg] to the LCD. Refer to the data sheet of
               the LCD module used for the list of command values and their effects.
               (Many LCD's have similar commands which are shown in the examples.)

Examples:
LCDCMD=0       Zero is a special case argument that is not an LCD command. When this
               value is used, the LCDCMD instruction sends a sequence of commands
               that initialize the LCD. This instruction and value must be used
               before using any other LCD instruction.
LCDCMD=1       Clear LCD display
LCDCMD=2       Set cursor to "home" position
LCDCMD=8       Display off
LCDCMD=12      Display on, cursor off
LCDCMD=13      Display on, cursor off, blinking of cursor position character on
               (large block)
LCDCMD=14      Display on, cursor on, cursor position character does not blink
               (underline)
LCDCMD=15      Display on, cursor on, blinking of cursor position character on
               (large block)
LCDCMD=16      Move cursor left
LCDCMD=20      Move cursor right

LCDCMD=24      Scroll display left
LCDCMD=30      Scroll display right

LCDPRN [arg]   Display a byte value at the next cursor location on the LCD in
               decimal or hexadecimal, or as a character. This instruction works
               just like the PRINT instruction, but for the LCD. For formatting
               details see PRINT.

LCDCUR=[arg]   Move the LCD cursor to position [arg]. Refer to the data sheet of
               the LCD module used to determine which line and column of the LCD
               correspond to a particular cursor position. See Appendix B for a
               list of common LCD modules and their cursor addresses.

Relay I/O instructions:

RELAY1=[arg]   Turn on Relay 1 if [arg] is 1, turn it off if 0 (uses bit 0 of [arg])
RELAY2=[arg]   Turn on Relay 2 if [arg] is 1, turn it off if 0 (uses bit 0 of [arg])
RELAY3=[arg]   Turn on Relay 3 if [arg] is 1, turn it off if 0 (uses bit 0 of [arg])
RELAY4=[arg]   Turn on Relay 4 if [arg] is 1, turn it off if 0 (uses bit 0 of [arg])
RELAY5=[arg]   Turn on Relay 5 if [arg] is 1, turn it off if 0 (uses bit 0 of [arg])
RELAY6=[arg]   Turn on Relay 6 if [arg] is 1, turn it off if 0 (uses bit 0 of [arg])
RELAY7=[arg]   Turn on Relay 7 if [arg] is 1, turn it off if 0 (uses bit 0 of [arg])
RELAY8=[arg]   Turn on Relay 8 if [arg] is 1, turn it off if 0 (uses bit 0 of [arg])

RELAYS=[arg]  Change on/off status of all relays based on [arg], where
              Relays 8-1 are controlled by bits 7-0 of [arg] respectively

Examples:
RELAY1=1      turn on Relay 1
RELAYS=128    turn on Relay 8, turn off Relays 1 through 7
RELAYS=255    turn on all relays

Digital Output instructions:

Note: The digital outputs are manipulated by both the digital output instructions and the LCD instructions, which assume an LCD module connected to specific digital output signals.

DO1=[arg]     Set digital output #1 high if [arg] is 1, low if 0 (uses bit 0 of [arg])
DO2=[arg]     Set digital output #2 high if [arg] is 1, low if 0 (uses bit 0 of [arg])
DO3=[arg]     Set digital output #3 high if [arg] is 1, low if 0 (uses bit 0 of [arg])
DO4=[arg]     Set digital output #4 high if [arg] is 1, low if 0 (uses bit 0 of [arg])
DO5=[arg]     Set digital output #5 high if [arg] is 1, low if 0 (uses bit 0 of [arg])
DO6=[arg]     Set digital output #6 high if [arg] is 1, low if 0 (uses bit 0 of [arg])
DO7=[arg]     Set digital output #7 high if [arg] is 1, low if 0 (uses bit 0 of [arg])
DO8=[arg]     Set digital output #8 high if [arg] is 1, low if 0 (uses bit 0 of [arg])

DO=[arg]      Change on/off status of all digital outputs based on [arg], where
              outputs 8-1 are controlled by bits 7-0 of [arg] respectively

Examples:
DO=255        set all digital outputs high
DO=1          set digital output #1 high, digital outputs #2 through #8 low

Digital I/O instructions:

DI=[arg]      Change on/off status of all digital I/O based on [arg], where
              DI8-DI1 are controlled by bits 7-0 of [arg] respectively
If any digital I/O is to be used as an input, it must be set high, (its power up setting.)

IF DI1=0 [arg]   If digital I/O #1 is low jump to line number [arg]
IF DI1=1 [arg]   If digital I/O #1 is high jump to line number [arg]
IF DI2=0 [arg]   If digital I/O #2 is low jump to line number [arg]
IF DI2=1 [arg]   If digital I/O #2 is high jump to line number [arg]
IF DI3=0 [arg]   If digital I/O #3 is low jump to line number [arg]
IF DI3=1 [arg]   If digital I/O #3 is high jump to line number [arg]
IF DI4=0 [arg]   If digital I/O #4 is low jump to line number [arg]
IF DI4=1 [arg]   If digital I/O #4 is high jump to line number [arg]
IF DI5=0 [arg]   If digital I/O #5 is low jump to line number [arg]
IF DI5=1 [arg]   If digital I/O #5 is high jump to line number [arg]
IF DI6=0 [arg]   If digital I/O #6 is low jump to line number [arg]
IF DI6=1 [arg]   If digital I/O #6 is high jump to line number [arg]
IF DI7=0 [arg]   If digital I/O #7 is low jump to line number [arg]
IF DI7=1 [arg]   If digital I/O #7 is high jump to line number [arg]
IF DI8=0 [arg]   If digital I/O #8 is low jump to line number [arg]
IF DI8=1 [arg]   If digital I/O #8 is high jump to line number [arg]
                 (The argument to IF instructions can be a byte or word)

Examples:
DI=255           set all digital I/O high
DI1=1            set digital I/O high for use as an input
IF DI1=0 100     if digital I/O #1 is low jump to line number 100

Interrupt Input, Switch, and LED instructions:

INT=[arg]    Set digital I/O INT high if [arg] is 1, low if 0 (uses bit 0 of [arg])
LED=[arg]    Turn on LED if [arg] is 1, turn off if 0 (uses bit 0 of [arg])
If INT is to be used as an input, it must be set high, (its power up setting.)

IF INT=0 [arg]   If digital I/O INT is low jump to line number [arg]
IF INT=1 [arg]   If digital I/O INT is high jump to line number [arg]
IF SW1=0 [arg]   If switch SW1 is low (pressed) jump to line number [arg]
IF SW1=1 [arg]   If switch SW1 is high (not pressed) jump to line number [arg]
                 (The argument to IF instructions can be a byte or word)

Examples:
INT=1            set interrupt input high for use as an input
IF INT=0 100     if interrupt input is low jump to line number 100
IF SW1=0 200     if SW1 is pressed jump to line number 100
LED=1            turn on the LED

Analog Input instructions:

SELAI [arg]      Select Analog Input to read with the READAI, IF AI<BA [arg],
                 and IF AI>[arg] instructions
After the following instructions, variable B will contain the high byte and variable A will contain the low byte of the word value corresponding to the voltage read from the selected analog input.

READAI      Read the Analog Input and place the word value in variables B and A.

BAVOLTS     Convert the word value representing voltage in variables B and A
            into binary-coded-decimal (BCD) digits in variables A, B, C, and D.
After this instruction the variables will contain the following: A=volts, from 0 to 5, B=tenths of volts, from 0 to 9, C=hundredths of volts, from 0 to 9, and D=thousandths of volts, from 0 to 9. The voltage can then be displayed in the desired format and resolution by displaying whichever digits are significant.


Example:
SELAI 8        select Analog Input #8
READAI         get word value from Analog Input
BAVOLTS        convert the variables to voltage
PRINT A        display volts
PRINT "."      display decimal point
PRINT B        display tenths
PRINT C        display hundredths
PRINT D        display thousandths



IF AI<BA [arg]   If the word value read from the Analog Input is less than the word
                 value in variables B and A then jump to line number [arg].
IF AI>BA [arg]   If the word value read from the Analog Input is greater than the
                 word value in variables B and A then jump to line number [arg].

Example:
BA=3276         set value in variables A and B to A/D value for 4.000 volts
IF AI<BA 200    if the analog input is less than 4 volts goto line 200

The BAVOLTS instruction can also be used at the command prompt to determine the values for variables B and A.


BA=xxxx         set variables A and B to value from 0 to 4095
BAVOLTS         convert to voltage
PRINT A         display volts
PRINT B         display tenths of volts
PRINT C         display hundredths of volts
PRINT D         display thousandths of volts

Real Time Clock instructions:

The IC51 has an on-board battery backed-up real-time clock that includes time, date, day of week, and automatic leap year adjustments. TMB-IC51 provides access to this clock via these specific variables:

H = hours, 0 to 23 (24 hour format, e.g., 12 midnight is 0 hours, 12 noon is 12 hours, 11 PM is 23 hours)
M = minutes, 0 to 59
S = seconds, 0 to 59
N = month, 1 to 12
D = day of the month, 1 to 31
Y = year, 0 to 99
W = day of week, 1 to 7 (you may use any number to represent any day)

WRITERTC      set clock using the values in variables H, M, S, N, D, Y, W
READRTC       read clock and place the values in variables H, M, S, N, D, Y, W

Examples:
H=23          23 hundred hours (11 PM)
M=0           zero minutes
S=0           zero seconds
N=1           January
D=1           first day of month
Y=5           2005
W=7           Saturday
WRITERTC      set clock to 11:00 PM on Saturday December 1st, 2005

READRTC       read clock values
PRINT H       display hours
PRINT ":"
PRINT M       display minutes
PRINT ":"
PRINT S       display seconds

EEPROM instructions:

Part of the EEPROM used to store the user program can also be used to store program data such as configuration information that must be saved if the power is removed from the IC51. EEPROM addresses 0 through 8189 correspond to TMB-IC51 line numbers 1 through 2730 since each program line uses 3 bytes. EEPROM address 8190 is used to store the BOOTON/BOOTOFF status and EEPROM address 8191 is used to store the baud rate. Using an EEPROM address associated with a program line's storage will overwrite any program line stored there. Likewise, entering a program line whose storage includes an EEPROM address will overwrite the data stored there.

When data is written to an EEPROM address, it is likely that the data will represent program instructions and arguments, which TMB-IC51 will attempt to RUN and LIST. In order to prevent the program from running this data as an instruction, an END instruction must be placed at a line number lower than any data address used so that the program will stop before reaching the data. If this is not done, the program may do any number of undesirable things, e.g., erasing itself or changing the baud rate unexpectedly. It is also suggested that the highest possible EEPROM addresses be used for data so that it is LISTED after the normal program lines.

Most EEPROMs may be written tens of thousands of times, but even this limit could be exceeded if the program wrote to the EEPROM in an unintended loop caused by incorrect programming, so some caution should be used. EEPROMs may be read an unlimited number of times.

WRITEEE [arg]  Write the value in variable A to the EEPROM byte at address [arg]

READEE [arg]   Read the EEPROM byte at address [arg], put the value in variable A
               (The argument to EEPROM instructions can be a byte or word)

Examples:
A=21           set variable A value
WRITTEE 8189   write variable A to EEPROM location 8189 (highest recommended)
READEE 8189    read EEPROM location 8189 and place value in variable A

Appendix A

The following is a table of character codes and their equivalent (ASCII) characters. These values are useful when using the PRINT instruction or when testing variables (like the variable KEY) for a specific character.

Decimal          Control Char. Control      Decimal               Decimal
Value   Character  Abbreviation  Key        Value   Character     Value   Character
-------------------------------------------------------------------------------------------
00      NULL                NUL  ^@         45      - (hyphen)    90      Z    
01      START OF HEADING    SOH  ^A         46      . (period)    91      [ (left bracket)
02      START OF TEXT       STX  ^B         47      /             92      \ (backslash)
03      END OF TEXT         ETX  ^C         48      0             93      ] (right bracket)
04      END OF TRANSMIT     EOT  ^D         49      1             94      ^ (carat)
05      ENQUIRY             ENQ  ^E         50      2             95      _ (underscore)
06      ACKNOWLEDGE         ACK  ^F         51      3             96      ` (accent)
07      BEEP                BEL  ^G         52      4             97      a
08      BACK SPACE          BS   ^H         53      5             98      b
09      HORIZONTAL TAB      HT   ^I         54      6             99      c
10      LINE FEED           LF   ^J         55      7             100     d
11      VERTICAL TAB        VT   ^K         56      8             101     e
12      FORM FEED           FF   ^L         57      9             102     f
13      CARRIAGE RETURN     CR   ^M         58      :             103     g
14      SHIFT OUT           SO   ^N         59      ;             104     h
15      SHIFT IN            SI   ^O         60      <             105     i
15      DEVICE LINK ESC     DLE  ^P         61      =             106     j
17      DC1 X-ON            DC1  ^Q         62      >             107     k
18      DC2                 DC2  ^R         63      ?             108     l
19      DC3 X-OFF           DC3  ^S         64      @             109     m
20      DC4                 DC4  ^T         65      A             110     n
21      NEG. ACKNOWLEDGE    NAK  ^U         66      B             111     o
22      SYNC. IDLE          SYN  ^V         67      C             112     p
23      END OF TX BLOCK     ETB  ^W         68      D             113     q
24      CANCEL              CAN  ^X         69      E             114     r
25      END MEDIUM          EM   ^Y         70      F             115     s
26      SUBSTITUTE          SUB  ^Z         71      G             116     t
27      ESCAPE              ESC             72      H             117     u
28      RIGHT ARROW (on PC)                 73      I             118     v
29      LEFT ARROW  (on PC)                 74      J             119     w
30      UP ARROW    (on PC)                 75      K             120     x
31      DOWN ARROW  (on PC)                 76      L             121     y
32      BLANK SPACE                         77      M             122     z
33      !                                   78      N             123     { (left brace)
34      " (double quote)                    79      O             124     | (vertical bar) 
35      # (number sign)                     80      P             125     } (right brace)
36      $                                   81      Q             126     ~ (tilde)
37      %                                   82      R             127     DELETE
38      &                                   83      S
39      ' (single quote)                    84      T
40      ( (open parenthesis)                85      U
41      ) (close parenthesis)               86      V
42      *                                   87      W
43      +                                   88      X
44      , (comma)                           89      Y

Appendix B

LCD module cursor positions



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