| Port |
Device |
Type |
Function |
| 01 |
Intel 8275 CRT |
IN/OUT |
PARAMETER PORT |
| 02 |
Intel 8275 CRT |
IN/OUT |
COMMAND/STATUS PORT |
| 04 |
uPD765 FDC |
IN |
MAIN STATUS REGISTER |
| 05 |
uPD765 FDC |
IN/OUT |
DATA REGISTER |
| 08 |
Z80A SIO |
IN/OUT |
DATA CHANNEL A (TERMINAL) |
| 09 |
Z80A SIO |
IN/OUT |
DATA CHANNEL B (PRINTER) |
| 0A |
Z80A SIO |
IN/OUT |
CONTROL CHANNEL A (TERMINAL) |
| 0B |
Z80A SIO |
IN/OUT |
CONTROL CHANNEL B (PRINTER) |
| 0C |
Z80A CTC |
IN/OUT |
CTC1 CHANNEL 0 (SIO A BAUDRATE) |
| 0D |
Z80A CTC |
IN/OUT |
CTC1 CHANNEL 1 (SIO B BAUDRATE) |
| 0E |
Z80A CTC |
IN/OUT |
CTC1 CHANNEL 2 (CRT INT) |
| 0F |
Z80A CTC |
IN/OUT |
CTC1 CHANNEL 3 (FDC INT) |
| 10 |
Z80A PIO |
IN/OUT |
DATA (KEYBOARD) |
| 11 |
Z80A PIO |
IN/OUT |
DATA (PARALLEL I/O) |
| 12 |
Z80A PIO |
IN/OUT |
CONTROL (KEYBOARD) |
| 13 |
Z80A PIO |
IN/OUT |
CONTROL (PARALLEL I/O) |
| 14 |
SWITCH/MOTOR |
IN/OUT |
READ DIP SWITCHES / ENABLE FLOPPY MOTOR |
| 18 |
ROM |
OUT |
DISABLE PROM0 |
| 19 |
ROM |
OUT |
DISABLE PROM1 |
| 1C |
SOUND |
OUT |
BEEP |
| 44 |
Z80A CTC |
IN/OUT |
CTC2 CHANNEL 0 (WDC INT), ONLY WITH RC763 |
| 45 |
Z80A CTC |
IN/OUT |
CTC2 CHANNEL 1 (UNUSED), ONLY WITH RC763 |
| 46 |
Z80A CTC |
IN/OUT |
CTC2 CHANNEL 2 (UNUSED), ONLY WITH RC763 |
| 47 |
Z80A CTC |
IN/OUT |
CTC2 CHANNEL 3 (UNSED), ONLY WITH RC763 |
| 60 |
WD1002 WDC |
IN/OUT |
DATA REGISTER |
| 61 |
WD1002 WDC |
IN/OUT |
ERROR REGISTER / WRITE PRECOMP |
| 62 |
WD1002 WDC |
IN/OUT |
SECTOR COUNT |
| 63 |
WD1002 WDC |
IN/OUT |
SECTOR NUMBER |
| 64 |
WD1002 WDC |
IN/OUT |
CYLINDER LOW |
| 65 |
WD1002 WDC |
IN/OUT |
CYLINDER HIGH |
| 66 |
WD1002 WDC |
IN/OUT |
SIZE/DRIVE/HEAD |
| 67 |
WD1002 WDC |
IN/OUT |
STATUS / COMMAND REGISTER |
| D1 |
SEM702 |
OUT |
CHARACTER NUMBER REGISTER |
| D2 |
SEM702 |
OUT |
CHARACTER LINE REGISTER |
| D3 |
SEM702 |
OUT |
CHARACTER DATA REGISTER |
| E0 |
SIMFTP |
IN/OUT |
EMULATOR FILE TRANSFER COMMAND REGISTER |
| E1 |
SIMFTP |
IN/OUT |
EMULATOR FILE TRANSFER DATA REGISTER |
| EE |
MEMDISK |
OUT |
MEMORY DISK TRACK REGISTER |
| EF |
MEMDISK |
IN/OUT |
MEMORY DISK TRACK / STATUS REGISTER |
| F0 |
Intel 8237 DMA |
IN/OUT |
CHANNEL 0 ADDRESS REGISTER (WDC) |
| F1 |
Intel 8237 DMA |
IN/OUT |
CHANNEL 0 COUNTER REGISTER (WDC) |
| F2 |
Intel 8237 DMA |
IN/OUT |
CHANNEL 1 ADDRESS REGISTER (FDC) |
| F3 |
Intel 8237 DMA |
IN/OUT |
CHANNEL 1 COUNTER REGISTER (FDC) |
| F4 |
Intel 8237 DMA |
IN/OUT |
CHANNEL 2 ADDRESS REGISTER (CRT) |
| F5 |
Intel 8237 DMA |
IN/OUT |
CHANNEL 2 COUNTER REGISTER (CRT) |
| F6 |
Intel 8237 DMA |
IN/OUT |
CHANNEL 3 ADDRESS REGISTER (CRT CASCADE) |
| F7 |
Intel 8237 DMA |
IN/OUT |
CHANNEL 3 COUNTER REGISTER (CRT CASCADE) |
| F8 |
Intel 8237 DMA |
IN/OUT |
WRITE COMMAND REGISTER / READ STATUS REGISTER |
| F9 |
Intel 8237 DMA |
OUT |
WRITE REQUEST REGISTER |
| FA |
Intel 8237 DMA |
OUT |
WRITE SINGLE MASK REGISTER BIT |
| FB |
Intel 8237 DMA |
OUT |
WRITE MODE REGISTER |
| FC |
Intel 8237 DMA |
OUT |
CLEAR BYTE POINTER FLIP/FLOP |
| FD |
Intel 8237 DMA |
IN/OUT |
MASTER CLEAR / READ TEMPORARY REGISTER |
| FF |
Intel 8237 DMA |
OUT |
WRITE ALL MASK REGISTER BITS |
