Zenith Data Systems (ZDS) Engineering Archives

Z-Machine concept (Orange ) schematics

This board was an off-site rogue design done almost exclusively by Larry Plummer. The Orange was a pre-cursor to the production Z-100 and was intended to include such features as voice synthesis and BSR X-10 control. It was a prototype of a "home computer" that would challenge the Apple II and TRS-80 machines. This board was basically a proof of concept for an 8088 hardware design and used as a software development platform by Gregg Chandler, Jim Tittsler and others. The primary OS was CP/M.

These schematics are scans of the original hand drawn schematics.

• Page 1    8088 CPU, 8284, boot ROMs & I/O decode
• Page 2    Floppy Disk & game controllers
• Page 3    TI 9918 video generator, video memory & 76489 sound generator
• Page 4    Miscellaneous I/O KBD encoder & IRQs
• Page 5    DRAM control and 64Kb memory array

Z-100 main board schematics

This is the system that was introduced around the same time that the IBM PC was first available.

These schematics are scans of the original hand drawn schematics.

• Page 1    8085 & 8088 CPUs, dual 8259s, buffers, swap logic & clock generation
• Page 2    Buffers, I/O decode, video connector & boot ROM
• Page 3    DRAM control, memory array w/parity & buffers
• Page 4    KBD control, serial & parallel I/O, timer & lightpen interface
• Page 5    S-100 bus and terminations

Z-100 bit-mapped video board schematics

• Page 1    Video connector, video I/O decode, buffers, 6821 port, 6845 controller & data shifters
• Page 2    3 x 64Kb bit mapped video memory
• Page 3    Video D/A & outputs

Z-100 (H207) floppy disk controller schematics

• Page 1    S-100 interface, 1797 controller, 5¼" & 8" floppy connectors
• Page 2    Voltage regulation and bypass

Z159 IBM compatible

• PAL code

Mongoose main board 25 MHz 386 ZDS chipset (ISA)

• Mongoose Main Board   
• PAL code

Mongoose I/O board (ISA)

• Mongoose I/O Board   

Piranha main board 33MHz 386 ZDS chipset (EISA)

• Piranha Main Board
• PAL code

Piranha 64K cache module

• Piranha 64K Cache Board

Piranha I/O board

• Piranha I/O Board

Viper main board 33MHz 486 ZDS chipset (ISA)

• Viper Main Board

Viper SCSI/Floppy board

• Viper SCSI/Floppy Board

Aurora main board 33MHz 386 82358/82359 Intel chipset (EISA)

• Aurora Main Board
• PAL code

Aurora backplane

• Aurora 2 high   ISA Backplane
• Aurora 2 high EISA Backplane
• Aurora 4 high EISA Backplane

Aurora 486SX CPU module

• Aurora 486SX CPU module

Aurora 486DX CPU module

• Aurora 486DX CPU module

Aurora WAM (Windows Accelerator Module)

• Aurora WAM module