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1991-05-23
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ST05X XT Interface
-------------------------------------------------
Host Adapter
-------------------------------------------------
Installation Guide
=================================================
__________________________________________Seagate
Copyright Notice:
Seagate, Seagate Technology and the Seagate logo are registered
trademarks of Seagate Technology, Inc.
@Copyright 1989 Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, California 95066-4544, USA
Telephone: 408/438-6550
Publication Number: 36121-001, Rev. A
Seagate reserves the right to change, without notice, product
offerings or specifications.
This publication, and all material contained herein, are copyrighted
with all rights reserved. No part of this publication may be copied
without written permission of Seagate Technology, Inc.
PC AT and PC-DOS are registered trademarks of International
Business Machines Corporation. XT is a trademark of International
Business Machines Corporation.
Disk Manager is a registered trademark of Ontrack Computer
Systems, Inc.
MS-DOS is a registered trademark of Microsoft Corporation.
1
Introduction:
The ST05X Host Adapter is used in conjunction with the Seagate XT
interface drives and an IBM PC/XT (or compatible) computer.
The ST05X is a half-slot board. It provides a 40-pin XT interface
connector for systems lacking an XT interface drive connector on the
motherboard. The ST05X supports two drives only.
The ST05X provides address decoding for hard drive I/O and buffering
of signals between the host and the hard drive. The BIOS address is
jumper-selectable. Additionally, the ST05X offers the following
features for IBM PS/2 Model 25/30 or Drive-on-a-card applications:
* Drive Activity LED connector
* Auxiliary DC Power Connector
* Standard Mounting Points
2
1.0 ST05X Configuration
The ST05X requires no special installation software. The XT interface
drive can be low-level formatted using the ST05X BIOS (DOS Debug
command G=C800:5) or the system BIOS. For additional information,
refer to the drive's Product Manual.
1.1 XT Interface Drive Connectors: J1/J2
J1 and J2 are 40-pin XT interface drive connectors. Refer to Figure
1.
J1 Connects to Drive 1 320H-323H
J2 Connects to Drive 2 324H-327H
The ST05X supports two XT interface drives. For additional
information on the XT interface, refer to the Seagate XT interface
manual/
1.2 BIOS Address Selection: JP1
╒═══════════╤═══════════╤═══════════════╤══════════════╕
│ │ │ BIOS │ │
│ Pins A-B │ Pins C-D │ EPROM/ROM │ BIOS RAM │
╞═══════════╪═══════════╪═══════════════╪══════════════╡
│ Open │ Open │ C8000-CBF7F │ CBF80-CBFFF │
├───────────┼───────────┼───────────────┼──────────────┤
│ Open │ Shorted │ D8000-DBF7F │ DBF80-DBFFF │
├───────────┼───────────┼───────────────┼──────────────┤
│ Shorted │ Open │ D0000-D3F7F │ D3F80-D3FFF │
├───────────┼───────────┼───────────────┼──────────────┤
│ Shorted │ Shorted │ E0000-E3F7F │ E3F80-E3FFF │
└───────────┴───────────┴───────────────┴──────────────┘
3
Figure 1: ST05X XT Interface Host Adapter
┌─ Drive Connectors
│
┌────────────────────────────────│─────┐ ▌▀▀▀▀
│ 1 ::::::::::::::::::::──J1─┤ ┌──┼─▌
┌───┘ °°°° 1 │ └°─┼─▌
│ │ ::::::::::::::::::::──J2─┘ │ ▌
LED ─────J3───┘ 1 │ ▌
│ D° °B ───JP1────── BIOS Address
│ C° °A │ ▌ Selection
│ │ ▌
│ │ ▌
│ │ ▌
│ ┌──┼─▌
│ ≡≡▌≡}── Aux Drive └°─┼─▌
└─┐ J4 DC Power │ ▌
└──────┐ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄ ▄┌────┘ ▌
└─▀─▀─▀─▀─▀─▀─▀─▀─▀─▀─▀─▀─▀─▀┘ ▌
▌
4
1.3 Auxiliary Drive DC Power Connector: J4
J4 is a 6-pin, right-angle header. J4 may be used to supply DC power
to a hard drive. This is provided for systems which lack an available
power harness or Drive-on-a-card applications. Refer to Figure 1.
╒══════╤════════════╤════════════════╕
│ Pin │ Signal │ Description │
╞══════╪════════════╪════════════════╡
│ 1 │ +12VDC │ +12 VDC Power │
├──────┼────────────┼────────────────┤
│ 2 │ +12VDC │ +12 VDC Power │
├──────┼────────────┼────────────────┤
│ 3 │ +5VDC │ +5 VDC Power │
├──────┼────────────┼────────────────┤
│ 4 │ Key │ Pin Removed │
├──────┼────────────┼────────────────┤
│ 5 │ GND │ Ground │
├──────┼────────────┼────────────────┤
│ 6 │ GND │ Ground │
└──────┴────────────┴────────────────┘
1.4 LED Connector: J3
J3 is a 4-pin header. It provides connection to a drive activity LED.
Refer to Figure 1.
┌────────────┬────────────┐
│ Pin 1 or 4 │ + to LED │
├────────────┼────────────┤
│ Pin 2 or 3 │ - to LED │
└────────────┴────────────┘
-EOF-