65C02 ROM Code for my petit project Ordinateur
Interesting files you may want to see...
- kernel/via.s: This is my implementation for a PS/2 keyboard driver along with other 65C22 functionality. The keyboard clock is directly hooked up to the Non-maskable interrupt (nmi) pin on the 65C02, and the data pin is connected to bit 0 on PORTA of the 65C22. The 65C02 reads in one bit at a time.
- kernel/lcd.s Modified version of Ben Eater's LCD code.
| Base | Top | Name | Description |
|---|---|---|---|
| 0x000 | 0x0FF | zp |
Zero Page |
| 0x100 | 0x1FF | stack |
Stack |
| 0x200 | 0x5FFF | ram |
Random Access Memory |
| 0x1000 | 0x1100 | key buf |
Keyboard Buffer |
| 0x6000 | 0x600F | via |
Base address of 65c22 |
| 0xC000 | 0xFFFF | rom |
Read Only Memory |
| 0xFFFA (l) | 0xFFFB (h) | nmi |
Non-Maskable Interrupt |
| 0xFFFC (l) | 0xFFFD (h) | rst |
Reset |
| 0xFFFE (l) | 0xFFFF (h) | irq/brk |
Interrupt Request |