03025.pdf

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20 Meg Hard Disk Card (250-1032C/D/E)
Board Layout
Faxback Doc. # 3025
These drives use IDE "Integrated Drive Electronics" style interface.
┌───────────────────────────────────────────────────┐
│
W W
│
│
2 1
│
┌───┘
┌─┐
W
1 o o
│
│
│ │
3
2 o o
│
│
│ │
1 o IRQ 5
3 o o
│
│
│ │
2 o
│
│
│ │
3 o IRQ 2
│
│
J2A
│ │
│
│
│ │
┌─┐
│
│
│ │
│ │
│
│
│ │
│ │
│
│
└─┘
│ │
│
│
│ │
│
│
│ │
│
│
J2B
│ │
│
│
│ │
│
│
│ │
│
│
└─┘
│
└────┐
│
└─────┐
│
│
│
│
┌──────┘
│
│
└─────────────────────────────────────┘
Jumpers are as follows:
W1
W1
W2
W2
W3
W3
1-2 BIOS address CA000 hex
2-3 BIOS address C8000 hex
1-2 I/O
2-3 I/O
port 320 hex
port 324 hex
(default)
Selects Drive C> (default)
Selects Drive D>
1-2 IRQ5 (default)
2-3 IRQ2 (CORRECT SETTING FOR TANDY 1000 /A /SX /TX)
* Note on the Tandy 1000 /A /SX /TX the W3 jumper needs to be changed
to pins 2-3 for IRQ2 all other default values are correct.
(dkh-08/06/93)

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