I/O Address Map - IBM 5150 Hardware Reference Manual

I/O Address Map
HEX RANGE
9 8
7 6
5
4 3 2 1 0 DEVICE
~O-OF 0 0 0 0 0 Z
A3 A2 Al AO DMA CHIf' 8237-2
20-21
0 0 0 0 1 Z Z Z Z AO INTERRUPT 8259A
40-43 0 0 0 1 0
Z Z Z Al AO TtME R 8253-5
60-63 0 0 0 1 1 Z
Z Z Al
AO PP18255A-5
80-83
0 0 1 0 0 Z Z Z Al AO DMA PAGE REGS
• AX
0 0 1 0 1
NMt MASK REG
CX 0 0 1 1 0
RESERVED
EX
0 0 1 1 1
RESERVED
3F8-3FF 1 1
1 1 1 1 1 A2 Al
AO
TP RS-232-C CD
3FO-3F7 1 1
1 1 1 1 0 A2 Al
AD
51/4" DRV ADAPTER
2F8-2FF 1 0 1 1 1 1
1 A2
Al AO
RESERVED
378-37F 1 1 0 1 1 1
1 Z Al AO PARALLEL PRTR PRT
3DO-3DF
1 1 1 1 0 1
A3 A2 Al AO COLOR/GRAPHICS ADAPTER
278-27F 1 0 0 1 1 1
1 Z Al
AO
RESERVED
200-20F 1 0
0 0 0 0 A3 A2 Al AO
GAME
rio
ADAPTER
3BO-3BF
1 1
1
o
1 1
A3
A2 Al AO IBM MONOCHROME DISPLAY
PARALLEL PRINTER ADAPTER
Z
=
Don't Care, i.e., Not in Decode
*
At power on time, the Non Mask Interrupt NMI into the 8088 is masked off. This
mask bit can be set and reset via system software as follows:
Set mask: write X'80' to I/O Address X'AO' (enable NMI)
Clear mask: wfite X'OO' to I/O Address X'AO' (disable NMI)
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