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 with power and reset switches
6502 CPU Board trev_ham replica
Keyboard, Display & Cassette Interface Board trev_ham replica
40x25 VDU (Teletext) Interface Board my replica
Versatile Interface Board my replica
8K RAM + 8K ROM Board my replica with 8K RAM, DOS40B and NFS3.40 in 2532 EPROMs
8K RAM + 8K ROM Board my replica with 8K RAM, BASIC and FP in 2532 EPROMs
Econet Board my replica (ID13)
Floppy Disk Controller Board my replica
Dual 3.5" Floppy Drive Module my design fitted with a GOTEK (0/2) and 3.5" Sony MPF920-E floppy drive (1/3)


The first memory board is fitted with DOS40B and NFS 3.40 in 2532 EPROMs, the second memory board is fitted with BASIC and FP Extension in 2532 EPROMs, the two 8K RAM boards provide 16k of continuous memory from 2000 to 5FFF.

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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