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RC702 I/O ports


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