Model 100 RAM Variables
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| Address | Description | Initialized |
|---|---|---|
| F5F0 | Start of System | 035A |
| F5F2 | SP upon power-down | 035C |
| F5F4 | HIMEM value | 035E |
| F5F6 | Power-on hook | 0360 |
| F5F9 | BCR Interrupt hook | 0363 |
| F5FC | UART DR hook | 0366 |
| F5FF | TP interrupt hook | 0369 |
| F602 | LPS interrupt hook | 036C |
| F604 | Power-on hook | 036F |
| F60F | OptROM hook | 0379 |
| F62A | OptROM installed | 0394 |
| F62B | 20 or 10 pps | |
| F639 | Cursor row | 03A3 |
| F63A | LCD cursor column | 03A4 |
| F63B | LCD active lines | 03A5 |
| F63C | LCD active columns | 03A6 |
| F63D | Label line flags | 03A7 |
| F648 | Reverse video if 1 | 03B2 |
| F64E | X-pixel set | 03B8 |
| F64F | Y-pixel set | 03B9 |
| F657 | Power-down value | 03C1 |
| F65B-F660 | Initial Stat setting | 03C5 |
| F674 | LPOS printer column | 03DE |
| F675 | Output 0=LCD 1=LP | 03DF |
| F678 | Top of available RAM | 03E2 |
| F685 | Keyboard buffer | |
| F788 | POS- cursor position | |
| F789 | Key labels | |
| F88C | Location of PASTE buffer | |
| F923 | Seconds- units | |
| F924 | Seconds- tens | |
| F925 | Minutes- units | |
| F926 | Minutes- tens | |
| F927 | Hours- units | |
| F928 | Hours - tens | |
| F929 | Day of month- units | |
| F92A | Day of month- tens | |
| F92B | Day of week | |
| F92C | Month | |
| F92D | Year- units | |
| F92E | Year- tens | |
| F962-F9B9 | Directory 6BF1+ | |
| F9BA-F9C4 | OptROM or filename | |
| F9C5-FA74 | Directory | |
| FAAC | Character recently sent | |
| FAAE | Port A8 contents | |
| FAC0 | Lowest installed RAM | |
| FADA-FB14 | RST 38 hooks - all RET | |
| FB16-FB39 | RST 38 hooks - all error 5 | |
| FBB0 | Top of DO files | |
| FBB2 | Top of CO files | |
| FC18 | Floating point accumulator 1 | |
| FC69 | Floating point accumulator 2 | |
| FC82 | Maxfiles? | |
| FC93-FC98 | Filename | |
| FCC0-FDFF | ALT-LCD | |
| FE00-FF3F | LCD memory | |
| FF40 | Distant computer sent XOFF | |
| FF41 | This Model 100 sent XOFF | |
| FF42 | Is XOFF enabled? | |
| FF44 | SOUND OFF=1 ON=0 | |
| FF45 | Port E8 contents | |
| FF8B | Address of baud rate |
