IBM 62X0776
Supported the particular 20 MB sized drives that were optionally fitted to the later model 5160s.
IBM referred to this controller as the "20MB Fixed Disk Drive Adapter"
Switch Settings
Switches 1 2 configure drive 0.
Switches 3 4 configure drive 1.
The following table shows the settings for drive 0 (i.e. switches 1 2). The settings for drive 1 (i.e. switches 3 4) are the same.
Table
Address |
Switch Settings
for drive 0 |
Drive Characteristics |
Example |
Comment |
| 0 |
1=on 2=on |
Cylinders = 306 / Heads = 4 / SPT = 17 / WPC = 0 / step pulses per here are valid |
|
Not IBM Type 1 - type 1 has a WPC of 128 |
| 1 |
1=on 2=off |
Cylinders = 612 / Heads = 4 / SPT = 17 / WPC = 0 / step pulses per here are valid |
|
In 1986, known as IBM Type 16 |
| 2 |
1=off 2=on |
Cylinders = 615 / Heads = 4 / SPT = 17 / WPC = 300 / step pulses per here are valid |
Seagate ST-225 [20MB HH] |
In 1986, known as IBM Type 2 |
| 3 |
1=off 2=off |
Cylinders = 306 / Heads = 8 / SPT = 17 / WPC = 128 / step pulses per here are valid |
IBM WD25 [20MB FH] |
In 1986, known as IBM Type 13 |
The information in the above table was sourced the book: Upgrading Repairing PCs, Scott Mueller, 5th Edition, page 761/762/763 (or page 387 of 1st edition)
That matches well with the list that SpeedStor software reports.
IBM Fixed Disk Adapter
Производитель
IBM
Используемые чипы
XEBEX 3198, Zilog Z80 CPU, XEVEC 8642HQG
Тип
MFM disk drive controller
Просмотрено 483 раз
1 Августа 2020
