ST07A, ST08A ------------------------------------------------- AT INTERFACE HOST ADAPTER ------------------------------------------------- INSTALLATION GUIDE ================================================= ----------------------------------------Seagate Copyright Notice: Seagate, Seagate Technology and the Seagate logo are registered trademarks of Seagate Technology, Inc. @Copyright 1990, Seagate Technology, Inc. 920 Disc Drive Scotts Valley, CA 95066-4544, USA 408/438-6550 Publication Number: 36118-001, Rev. B Seagate reserves the right to change, without notice, product offerings or specifications. This publication is copyrighted with all rights reserved. No part of this document may be copied without written permission of Seagate Technology, Inc. IBM and PC AT are registered trademarks of International Business Machines Corporation. 1 Introduction: The ST07A and ST08A Host Adapters are used in conjunction with a Seagate AT interface drive and an IBM PC AT (or compatible) computer. They are both half-slot boards, which provide a 40-pin AT interface connector for systems lacking an AT interface drive connector on the system motherboard. The ST07A/ST08A support two AT interface drives. They provide address decoding for hard drive I/O and buffering of signals between the host and the hard drive. The ST08A supports up to two floppy diskette drives: * 5.25-inch, 260 KByte/1.2 MByte * 3.5-inch, 720 KByte/1.44 MByte An auxiliary DC power connector and mounting points are provided on both boards for "Drive-on-a-Card" applications. 2 Figure 1: ST07A/ST08A AT Interface Host Adapter J2 ÚÄ Drive-on-a-Card Mounting Point Diskette ³ Connector J3 LED ³ J1 AT Interface (ST08A only) ³ ÚÄÄÄÙ Hard Disc Connector ³ ÚÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ Ýßßßß ³ ³ 1 1 ø ³ ÚÄÄÅÄÝ ³ ³ :: øøøø :::::::::::::::::::: ÀøÄÅÄÝ ³ ³ :: 1 ³ Ý ÀÄÄÅÄÄ :: ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÅÄÄÄ JP2 ³ :: 1 ³ Ý Disc/Diskette ³ :: øø ³ Ý Address ³ :: ³ Ý Select ³ :: Ú1ÄÄÄÄ JP4 Diskette Controller Enable ³ Ý ³ : ÚÄÄÄÄÄÄÄÄÄÄÅÄÄÄ JP6 I/O ³ ððÝð}ÄÄ J4 Aux DC Power to 1 ÚÄÄÅÄÝ Channel ³ 1¿ Hard Disc øø ÀøÄÅÄÝ Ready ³ øøøÀÄÄÄ¿ ³ Ý À¿ Ü Ü Ü Ü Ü Ü ÜÚÄÅÄÄ¿ Ü Ü Ü Ü Ü Ü Ü Ü Ü Ü Ü Ü Ü ÜÚÄÄÄÄÙ Ý ÀÄßÄßÄßÄßÄßÄßÄßÙ ³ ÀÄßÄßÄßÄßÄßÄßÄßÄßÄßÄßÄßÄßÄßÄßÙ Ý ÀÄ JP5 Disable Interrupt Ý 3 1.0 ST07A/ST08A Interface Connector/User Options 1.1 AT Interface Drive Connector: J1 J1 is a 40-pin header. J1 provides the AT interface connection to the hard drive. Maximum cable length: 18 inches (.45 meter). 1.2 Floppy Diskette Connector: J2 (ST08A Only) J2 is a 34-pin header. J2 provides connection to floppy diskette drives. Refer to Section 1.6 for supported formats. 1.3 LED Connector: J3 J3 is a 4-pin header. J3 provides connection to a drive activity indicator. ----------------------------- | Pin 1 or 4 | + to LED | ----------------------------- | Pin 2 or 3 | - to LED | ----------------------------- 4 1.4 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 for "Drive-on-a-card" applications. ----------------------------------------- | Pin | Signal | Description | ========================================= | 1 | + 12 VDC | + 12 VDC Power | ----------------------------------------- | 2 | + 12 VDC | + 12 VDC Power | ----------------------------------------- | 3 | + 5 VDC | + 5 VDC Power | ----------------------------------------- | 4 | Key | Pin Removed | ----------------------------------------- | 5 | GND | Ground | ----------------------------------------- | 6 | GND | Ground | ----------------------------------------- 1.5 Hard Drive I/O Address Selection: JP2 JP2 provides address decoding for hard drive I/Os. ---------------------------------------------------------- | Pin | Address Selection | Drive Address | ========================================================== | 1-2 | Primary Address | 1F0-1F7, 3F6-3F7 | | Open | Standard Configuration | | ---------------------------------------------------------- | 1-2 | Secondary Address | 170-177, 376-377 | |Shorted| | | ---------------------------------------------------------- 5 1.5.1 Floppy Diskette Drive I/O Address Selection: JP2 JP2 provides address decoding for the floppy diskette drive I/Os (ST08A only) ----------------------------------------------------------- | Pin | Address Selection | Diskette Drive | | | | Address | =========================================================== | 1-2 | Primary | 3F0-3F5, 3F7 | | Open | Standard Configuration | | ----------------------------------------------------------- | 1-2 | Secondary | 370-375, 377 | |Shorted| | | ----------------------------------------------------------- 1.6 ST08A Controller Enable: JP4 The ST08A supports up to two floppy diskette drives of the following formats: * 5.25-inch, 360 KByte/1.2 MByte * 3.5-inch, 720 KByte/1.44 MByte ----------------------------------------------------- | Pin | Diskette Controller Status | ===================================================== | Pins 1-2 Shorted | Controller Enabled | | | Standard Configuration | ----------------------------------------------------- | Pins 1-2 Open | Controller Disabled | ----------------------------------------------------- 6 1.7 Disable Interrupt While Busy: JP5 ------------------------------------------------------------- | Pin | Interrupt Status | ============================================================= | Pins 2-3 Shorted | The hard drive interrupt is | | | directly connected to the IRQ 14 | | | line of the AT bus. | | | | | | Standard For All Seagate AT | | | Interface Drives | ------------------------------------------------------------| | Pins 1-2 Shorted | IRQ14 to the host is cleared when the | | | the hard drive goes BUSY. This jumper | | | configuration is specially provided | | | for those systems which do not read | | | status following an interrupt. | |-----------------------------------------------------------| 1.8 I/O Channel Ready: JP6 ------------------------------------------------------------ | Pin | I/O Channel Status | ------------------------------------------------------------ | Pins 1-2 | I/O channel READY from hard drive is | | Open | not connected to the host. | | | Standard Configuration | ------------------------------------------------------------ | Pins 1-2 | I/O channel READY from the hard drive is | | Shorted | connected to the host. | ------------------------------------------------------------ -- End-of-File --