Difference between revisions of "68k:Ports:600000"
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| − | [[Category:68k:Ports:By Address|600000]] [[Category:68k:Ports:By Name|Battery Voltage]] | + | [[Category:68k:Ports:By Address|600000]] [[Category:68k:Ports:By Name|Battery Voltage / 92 LCD contrast]] |
This port controls I/O from pins 99 and 100 on the ASIC. It's used to check battery voltage on all calcs, and to control LCD contrast on the TI-92. | This port controls I/O from pins 99 and 100 on the ASIC. It's used to check battery voltage on all calcs, and to control LCD contrast on the TI-92. | ||
| − | + | * Bit 7: Pin 100 output enable (keep =0) | |
| − | + | * Bit 6: Pin 99 output enable (keep =0) | |
| − | + | * Bit 5: Data to pin 100 (TI-92: used for LSB of LCD contrast) | |
| − | + | * Bit 4: Data to pin 99 (not used) | |
| − | + | * Bit 3: Data from pin 100 (not used) | |
| − | + | * Bit 2: Data from pin 99 (1 if batt. voltage is above trigger level (see [[68k:Ports:600018|600018]]) | |
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Latest revision as of 19:20, 4 June 2006
This port controls I/O from pins 99 and 100 on the ASIC. It's used to check battery voltage on all calcs, and to control LCD contrast on the TI-92.
- Bit 7: Pin 100 output enable (keep =0)
- Bit 6: Pin 99 output enable (keep =0)
- Bit 5: Data to pin 100 (TI-92: used for LSB of LCD contrast)
- Bit 4: Data to pin 99 (not used)
- Bit 3: Data from pin 100 (not used)
- Bit 2: Data from pin 99 (1 if batt. voltage is above trigger level (see 600018)
