BT Monarch CPU Cards

Monarch Power up

Sights and Sounds of a Monarch power up, please note the voltmeters are not original equipment !

See also

Monarch Software

8085 CPU Firmware

8088 CPU Firmware

Monarch Database

4k Config Database

Monarch Backplane

Sub Pages

8088 CPU SA20078

8085 CPU SA20030

Technical Description Part 1

Technical Description Part 2

Monarch 8088 and 8085 CPU cards compared

BOARD SA20078 SA20030

CPU 8088 8085

offline EPROM 2x8k 3x2k (3x2716)

RAM 2x(1024 x 4 bit)

UART 3x 3xP8251A

Monarch CPU 8088 ASU 1A4/SA20078

Monarch PABX CPU 8088 ASU 1A4/SA20078

Monarch CPU 8088 ASU 1A4/SA20078

Monarch CPU 8088 ASU 1A4/SA20078

MONARCH CPU 8088 ASU 1A4/SA20078

MONARCH CPU 8088 ASU 1A4/SA20078

Monarch 8085 CPU ASU 1A2/SA20030

Monarch 8085 CPU ASU 1A2/SA20030

8085 v 8088

Address Bus

16 bits, allowing it to address up to 64 KB of memory V 20 bits, up to 1 MB of memory.

External Data Bus

8 bit v 8 bit

Stock of CPU and Memory cards

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