Intel 8288
The Intel 8288 is a bus controller chip for the Intel 8086 / 8087 / 8088 / 8089 processors has been developed. The module is supplied in a 20-pin DIL housing . He was u. a. licensed to NEC and Siemens .
If the 8086 (and also the 8088) are operated in maximum mode , they are primarily configured for multiprocessor operation or for working with coprocessors . Since the required control lines are not provided in this case, these are generated by the 8288. It has been used since the first PCs ( IBM-PC and IBM-PC XT ). The successor 82288 is used in the IBM PC AT .
Terminal assignment and function
The lines WR , M / IO , DT / R , DEN , ALE and INTA are lost as a result of the maximum mode . They are generated by the 8288 from lines S 0 , S 1 and S 2 .
| designation | Pin code | Input (E), output (A) |
function |
|---|---|---|---|
| V CC | 20th | Supply voltage (+5 V) | |
| GND | 10 | Ground (0 V) | |
| S 0 , S 1 , S 2 | 19, 3, 18 | E. | S tatus Input |
| CLK | 2 | E. | Cl oc k |
| AEN | 6th | E. | A ddress En able |
| CEN | 15th | E. | C ommand En able |
| IOB | 1 | E. | I nput / O utput B us Mode |
| MRDC | 7th | A. | M emory R ea d C ommand |
| MWTC | 9 | A. | M emory W ri t e C ommand |
| AMWC | 8th | A. | A dvanced M emory W rite C ommand |
| IORC | 13 | A. | I / O R ead C ommand |
| IOWC | 11 | A. | I / O W rite C ommand |
| AIOWC | 12 | A. | A dvanced I / O W rite C ommand |
| INTA | 14th | A. | Int errupt A cknowledge |
| DT / R | 4th | A. | D ata T ransmit / R eceive |
| THE | 16 | A. | D ata En able |
| MCE / PDEN | 17th | A. | MCE (when IOB is LOW), PDEN (when IOB is HIGH) |
| ALE | 5 | A. | A ddress L atch E nable |
Literature and data sheets
- Josef Koller: 16 Bit Microcomputer , 1st edition, Hofacker Verlag, Munich 1981, ISBN 3-921682-80-0 , chap. 4.2.3 "Bus Controller 8288", pp. 206–213.
- A. Fifi Zinser: Bus controller 8288 for 8086/88 processors , c't, 1988, issue 3, pp. 96-98.
- NEC Electronics (Europe) GmbH, 1982 Catalog, pp. 729-736.
- Intel data sheet: 8288 bus controller
Individual evidence
- ↑ Chemnitz University of Technology: The structure of the original IBM PC motherboard ( Memento of the original from December 8, 2011 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. .
