Intergraph Zx1 ViZual Workstation, Системное руководство

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Direct Memory Access (DMA) Channels
DMA Channel Data Width Assignment
0 8b or 16b Open
1 8b or 16b Second choice of ECP parallel port
2 8b or 16b Floppy drive controller
3 8b or 16b First choice of ECP parallel port
4 NA DMA controller to cascade channel
5 16b Open
6 16b Open
7 16b Open
Input/Output (I/O) Addresses
I/O Address (hex) Size Assignment
0000 – 000F 16 bytes DMA controller 1
0020
−
0021
2 bytes Interrupt controller 1
0040 – 0043 4 bytes Timer/counter 1
0048 – 004B 4 bytes Timer/counter 2
0060 1 byte Keyboard controller
0061 1 byte NMI and speaker
0064 1 byte Keyboard controller
0070 bit7 1 bit Enable NMI
0070 bit0:6 7 bits RTC address (max. 128 bytes)
0071 1 byte RTC data byte
0080 – 008F 16 bytes DMA page registers
00A0 – 00A1 2 bytes Interrupt controller 2
00C0 – 00DF 32 bytes DMA controller 2
0170
−
0177
8 bytes Secondary IDE channel
01F0 – 01F7 8 bytes Primary IDE channel
0200
−
0207
8 bytes Add-in card; audio/game port
0220 – 022F 16 bytes Add-in card; audio (Sound Blaster compatible)
0240 – 024F 16 bytes Add-inn card; audio (Sound Blaster compatible)
0278 – 027F 8 bytes Parallel port 2
02E8 – 02EF 8 bytes COM 4
02F8 – 02FF 8 bytes COM 2
0300
−
0301
2 bytes Add-in card; MIDI
0330 – 0335 6 bytes Add-in card; MIDI
0370
−
0375
6 byte Floppy drive channel 2
0376 1 byte Secondary IDE channel command