AD664
Table III details the memory locations and addresses used by this interface.
Table III. IBM PC Memory Map
HEX
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
REGISTER SELECTED
300
301
302
303
304
305
306
307
308
309
30A
30B
30C
30D
30E
30F
310
311
312
313
314
315
316
317
318
319
31A
31B
31C
31D
31E
31F
1
1
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Illegal Address
Mode Select, 1st Rank
Illegal Address
Mode Select, 1st Rank
Illegal Address
Mode Select, 1st Rank
Illegal Address
▼
Mode Select, 1st Rank
Mode Select, 2nd Rank
1
▼
▼
▼
1
0
DAC A, 4 LSBs, 1st Rank
DAC A, 8 MSBs, 1st Rank
DAC B, 4 LSBs, 1st Rank
DAC B, 8 MSBs, 1st Rank
DAC C, 4 LSBs, 1st Rank
DAC C, 8 MSBs, 1st Rank
DAC D, 4 LSBs, 1st Rank
DAC D, 8 MSBs, 1st Rank
2nd Rank
▼
1
▼
▼
▼
▼
▼
▼
▼
▼
Note: Shaded registers are readable.
D
REV.
–16–
ADI [ ADI ]
