My System 3

My System 3 Photo

From left to right:

Vero Bivolt PK60 PSU module (8HP) providing 5V@6A and +12V@2A
12HP Panel  
6502 CPU Board trev_ham replica
Keyboard, Display & Cassette Interface Board rev_ham replica
40x25 VDU (Teletext) Interface Board my replica
Versatile Interface Board my replica
8K RAM + 8K ROM Board original Acorn board
Econet Board my replica
1 spare slot  
Floppy Disk Controller Board my replica
Dual 3.5" Floppy Drive Module my design fitted with a pair of 3.5" drives (Sony MPF920)


The CPU Board is fitted with DOS in 2532 EPROM, the memory board is fitted with BASIC and FP Extension in 2532 EPROMs.

All fitted in an original Acorn System Vero Card Frame with my replica 8-slot Backplane.  Acorn must have had a bespoke PSU module that plugged into the 32-way sockets on the left of the backplane.  I have used a Vero Bivolt PSU which plugs into an H15 type socket, this is attached directly to the card frame and the power supply is wired to the backplane.  The 12HP panel conceals the two 32-way sockets and provides a mounting for a mains on/off and reset switch.

My System 3 Photo Rear

Again I've have added some side cheeks to the rear of the case to protect the backplane and wiring.

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