Datasheet

AD664

REV.

–16–

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

30011000000 0 0 Illegal Address

301 0 0 1 Mode Select, 1st Rank

302 0 1 0 Illegal Address

303 0 1 1 Mode Select, 1st Rank

304 1 0 0 Illegal Address

305 1 0 1 Mode Select, 1st Rank

306 1 1 0 Illegal Address

307 ▼ 1 1 1 Mode Select, 1st Rank

308 1 0 0 0 Mode Select, 2nd Rank

309 0 0 1

30A 0 1 0

30B 0 1 1

30C 1 0 0

30D 1 0 1

30E 1 1 0

30F ▼▼ 11 1 ▼

310 1 0 0 0 0 DAC A, 4 LSBs, 1st Rank

311 0 0 1 DAC A, 8 MSBs, 1st Rank

312 0 1 0 DAC B, 4 LSBs, 1st Rank

313 0 1 1 DAC B, 8 MSBs, 1st Rank

314 1 0 0 DAC C, 4 LSBs, 1st Rank

315 1 0 1 DAC C, 8 MSBs, 1st Rank

316 1 1 0 DAC D, 4 LSBs, 1st Rank

317 ▼ 1 1 1 DAC D, 8 MSBs, 1st Rank

318 1 0 0 0 2nd Rank

319 0 0 1

31A 0 1 0

31B 0 1 1

31C 1 0 0

31D 1 0 1

31E 1 1 0

31F ▼▼▼▼▼▼▼ 11 1 ▼

Note: Shaded registers are readable.