User`s manual

System 2800 User's Manual
5.3 Port addresses used by the 8" disk controller board
The controller board is shipped with the following port addresses
preselected for the signals listed.
Port Input
Output
EO
Status Camnand
El
Track Track
E2
Sector
rata
E3 Data rata
E4
DRQ Status
Drive,
Side,
Double density select
E5 DRQ Wait
E6
Serial rata Serial rata
E7
Serial Status
Serial
Canmand
Ports XO thru X5 are located on the 1793 chip. Fbrts X6 and X7 are on the
8251 chip (refer to Intel 8080 user's manual).
The Qume jumper locations are listed below.
1. X - Open
2. IX: - Open
3. D - Open
4. C - Jumper
5. I - Jumper
6.
R - Jumper
7. ffil, 2, 3, 4
8. 'IM1 and 'IM2
9. HL - Open
10. DS - Open
11. RI - Jumper
12. RR - Jumper
13. Y - Jumper
14. Z - Open
15. A - Jumper
16. B - Jumper
17. 2S - Open
18. DL - Open
19. WP - Jumper
20. NP - Open
5-2
Select appropriate drive address
Install on drive A only
Rev. 1-<:: 8/15/80