Toshiba 8000 Tecra 8000 Users Guide - Page 245
Input/output port address assignments
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221 System Resources The following table lists the computer's DMA channel assignments. DMA Use Notes 0 Sound system Choice for sound system 1 Sound system Choice for ECP 2 3.5-inch diskette drive 3 ECP Choice for sound system, ECP 4 Cascade from DMA channel 1 5 Reserved 6 Reserved 7 Reserved Input/output port address assignments The CPU accesses input/output devices, such as modems, by reading from them or writing to them. Each command to read or write must specify the address (in memory) for the port. Each device that communicates with the CPU must have a unique I/O port address. The following table lists the device names and their assigned I/O port addresses for the computer. Port address (h) Device/function Notes 000-01F 82C37: DMA controller 1 020-03F 82C59: PIC 1 040-05F 82C54: timer Part III: Appendixes
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