You'll need
- A85 assembler
- ZMAC assembler
- monobit font converter
make,srecored,iconvfrom your distribution's package repository
Burn either 27c512.hex, 27c256.hex, 27c128.hex or 27c64.hex to your EPROM chip.
CBIOS expects CF card to be formatted with MBR using LBR addressing and up to 4 primary partions of type 52h and size up to 8MB each. First 'track' of a partiotion is sytem track, put CCP+BDOS there, so CP/M can boot. You can access filesystem on these partitions or partition images from PC using either
cpmtools-compatible disk definition:
diskdef pac80
seclen 512
tracks 1024
sectrk 16
blocksize 8192
maxdir 512
skew 0
boottrk 1
os 2.2
end
256K memory space is divided to 16 16KB-pages. 64KB CPU address space is divided to 4 16KB-banks. Each bank can be mapped to any page. After reset all banks are mapped to page f. Video memory starts at 1810h offset in each video page/plane. Column 0 at 1810h-18ffh, column 1 at 1910h-19ffh, and so on, total 40 columns. Plane 0 color is navy blue, plane 1 color is sand, both planes together give white.
| Page | Type | Notes |
|---|---|---|
| 0 | RAM | |
| 1 | RAM | |
| 2 | RAM | |
| 3 | RAM | |
| 4 | RAM | video page 0 plane 0 at 1810-3fff |
| 5 | RAM | video page 0 plane 1 at 1810-3fff |
| 6 | RAM | video page 1 plane 0 at 1810-3fff |
| 7 | RAM | video page 1 plane 1 at 1810-3fff |
| 8 | RAM | optional |
| 9 | RAM | optional |
| a | RAM | optional |
| b | RAM | optional |
| c | RAM | optional |
| d | RAM | optional |
| e | RAM | optional |
| f | ROM |
| Port | Assigned to |
|---|---|
| 00-07 | EXT0 |
| 10-17 | EXT1 |
| 20-27 | EXT2 |
| 30-37 | CF |
| 08 | BANK0 |
| 48 | BANK1 |
| 88 | BANK2 |
| c8 | BANK3 |
| 1a | PPI PORT A |
| 1b | PPI PORT B (SEL=1) |
| 19 | PPI PORT B (SEL=0) |
| 1c | PPI PORT C |
| 1d | PPI CONTROL |
| 28 | UART DATA |
| 29 | UART CONTROL/STATUS |
| 38 | PSG |
| Function | SEL=0 | SEL=1 | 2nd 0 | 2nd 1 | 3rd 0 | 3rd 1 | 4th 0 | 4th 1 | |
|---|---|---|---|---|---|---|---|---|---|
| PB0 | gamepad | UP | UP | UP | UP | 0 | Z | 1 | UP |
| PB1 | gamepad | DOWN | DOWN | DOWN | DOWN | 0 | Y | 1 | DOWN |
| PB2 | gamepad | 0 | LEFT | 0 | LEFT | 0 | X | 1 | LEFT |
| PB3 | gamepad | 0 | RIGHT | 0 | RIGHT | 0 | MODE | 1 | RIGHT |
| PB4 | gamepad | A | B | A | B | A | B | A | B |
| PB5 | gamepad | START | C | START | C | START | C | START | C |
| PB6 | gamepad | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| PB7 | always=1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| WRITE | READ | |
|---|---|---|
| PC0 | video page | video page |
| PC1 | VBLANK interrupt enable | VBLANK interrupt enable |
| PC2 | UART interrupt enable | UART interrupt enable |
| PC3 | keyboard interrupt request | |
| PC4 | keyboard interrupt enable | keyboard strobe |
| PC5 | keyboard input buffer full | |
| PC6 | VBLANK interrupt request | |
| PC7 | UART interrupt request |