IBM PS2 and PS ValuePoint Subsystems (December 1992)
IBM PS/2 and PS/ValuePoint Subsystems is an IBM International Technical Support Center (Boca Raton) Redbook, document number GG24-4002-00, First Edition (December 1992). It applies to the PS/2 and PS/ValuePoint models as of December 1992. The abstract gives 147 pages; the PDF has 174. IBM describes it as intended "for IBM customers and systems engineers who need an understanding of the various hardware subsystems found in PS/2 and PS/ValuePoint systems". It is not a service manual.
Contents
[edit | edit source]Page numbers are the book's own.
| Chapter | Subjects | Page |
|---|---|---|
| 1. What is SCSI | standards, interface, physical and logical configuration, arbitration, synchronous and asynchronous transfer, performance, SCSI versus ESDI (1.10) | 1 |
| 2. IBM Implementation of SCSI | subsystem design, internal and external connections, terminator positioning (2.3.3), attachable devices, Reference Diskette configuration, logical units, multiple subsystems, operating system support, SCSI security (2.7), performance, quick installation guide | 17 |
| 3. Integrated Drive Electronics (IDE) | ATA standards, physical and logical interface, connectors, PS/ValuePoint IDE specifics, IDE versus SCSI | 31 |
| 4. XGA-2 Video Subsystem | Type 1, 2 and 3 video subsystems, multiple adapters, video BIOS, components, AVE disabled, installation, modes, identification | 43 |
| 5. Programming the XGA | registers, EMS drivers, applications written to the hardware interface | 63 |
| 6. SVGA Video Subsystems | the PS/ValuePoint SVGA-386 and SVGA-486 implementations | 71 |
| 7. Processor Complexes | Model 90 and 95 processor complexes, PS/2 and PS/ValuePoint upgrade options | 95 |
| 8. C2 Security | requirements, secured PS/2 models, secure I/O cables | 103 |
| 9. Standards | 109 | |
| Appendices | A video comparison; B feature comparisons; C POST error codes | 115, 117, 123 |
Useful to a repairer
[edit | edit source]- Terminator positioning (2.3.3): the SCSI bus needs a terminator at each end. IBM names three kinds: internal terminators that come with each device (not to be mixed), a subsystem terminator on some IBM SCSI adapters (a small orange part, to be removed with a chip puller), and an external terminator on the last external device.
- SCSI security (2.7) describes a data-security exposure: an external SCSI controller attached to the external port can read or write the internal disks even when a power-on password is set. IBM's remedy is physical control of access and, on some PS/2 models, secure I/O cables (8.3.4).
- POST error codes (Appendix C).
What this document does not contain
[edit | edit source]It has no FRU numbers, removal procedures, Symptom-to-FRU index, schematics or component values. For the register-level interface of the Micro Channel SCSI adapter see IBM PS2 SCSI-A Technical Reference.
Download: IBM PS2 and PS ValuePoint Subsystems Dec92.pdf