Cromemco System 400 Service Manual (S-100, Schematics, 1985) PDF

Description

Cromemco System 400 Service Manual (S-100, Schematics, 1985) PDF DOWNLOAD

Description

This System 400 Service Manual is a complete technical guide for servicing and maintaining the Cromemco System 400—a multi-user S-100 bus supermicrocomputer platform designed for serious applications. The manual includes installation instructions, board/cable settings, operator guidance, maintenance procedures, troubleshooting workflows, plus an illustrated parts list and schematics for major boards and the DPS4 power supply.

🗂️ Full Table of Contents (neatly organized)

Chapter 1 — General Description

• The Central Processor

• System Memory

• Hard Disk Drives

• Floppy Disk and Cartridge Tape Drives

• Serial I/O Controller

• Options and References

Chapter 2 — Installation

• Unpacking the System / Connecting Peripherals

• User Terminals

• Serial Printers

• Modems

• Adding Memory and Other Circuit Boards

• Circuit Board Cables and Switch Settings

  • The 64FDC

  • The XPU

  • The MCU and 2048MSU

  • The 1024KZ

  • The STDC

  • The OCTART

  • The Priority Interrupt Cable

Chapter 3 — Operator Information

• Turning On the System

• System Warning Lights

• Incorrect Line Voltage Setting / DC Power Failure / System Overheating

• Using Floppy Diskettes (parts, inserting)

• Using Tape Cartridges (write-protect, inserting)

• Booting the System

Chapter 4 — Maintenance

• Required Tools

• The Hard Disk Drives

• The Floppy Disk and Tape Drives

• The DPS4 Power Supply

• The Drive Area Fan

• The Card Cage Fans

• The Keyswitch and Bulk Power Supply

Chapter 5 — Troubleshooting

• Troubleshooting the Power Supply / The DPS4

• Line Fuses Blown / DC Power Failure Light On

• Warning Light Failure

• Fans Not Turning or Below Speed

• RDOS Command Summary

  • Swath Operator / Boot / Display Memory / Examine Input Port / Go

  • Initialize Baud Rate / Move / Output

  • Read All of Disk / Read Disk / Seek / Select Disk Drive

  • Substitute Memory / Test System / Verify / Write Disk

🧩 Includes

• Illustrated Parts List (Appendix A)

• Schematics (listed in the manual): 64FDC, OCTART, 2048MSU, 1024KZ, XMM, STDC, XPU, MCU, DPS4 Power Suppl 

📌 File Details

Keep your vintage System 400 running like it should—this manual gives you the exact maintenance steps, troubleshooting flow, and board schematics you need. Buy now for instant download and start servicing today.