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Table 2-2. Standard Address Assignments (cont.)
Address
Device A d d r e s s
Device
210 - 217
Expansion unit 3 9 0 - 39F
Available
218 - 21F
Available
3
A
0
3 A 9 *
Binary comm.
220 - 24F
Reserved
3
A
A
- 3AF
Available
250 - 277
Available
3
B
0
- 3BF
Mono disp./printer
278 - 27F
Reserved
3C0 - 3CF
Reserved
280 - 2EF
Available
3D0 - 3DF Color/graphics
2F0 - 2F7
Reserved
3E0 - 3E7
Reserved
2F8 - 2FF
Com2:
I 3E8 - 3EF
Available
300 - 31F
Available
3F0 - 3F7
Floppy disk
320 - 32F
Fixed disk
3F8 - 3FF
Coml:
330 - 377
Available
Setting the J8 Slot/Wait State Switch
This switch block consists of two switches: the J8 Slot switch (switch 1)
and the Wait State switch (switch 2). Setting the J8 Slot switch to ON
enables the board to occupy the J8 slot of an IBM PC/XT (the J8 slot is
right-most on the PC/XT motherboard); setting switch 1 to OFF (the
default position) disables the slot option.
Setting the Wait State switch to ON enables a 500 ns wait state, which
may be required in PCs having 8 MHz system clocks. Setting switch 2 to
OFF (the default position) disables the wait state.
Configuring the Interrupt Level
Interrupt levels are specified through jumper settings on the Interrupt
Level jumper block. Jumper positions 2 to 7 on the jumper block
correspond to IRQ2 to IRQ7, respectively. Position X (the default
position) disables the interrupt levels.
2-4
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Содержание PIO-12
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