My System 2

My System 2 Photo

From left to right:

Vero PK55 Trivolt PSU module (8HP) providing 5V@5A and +/-12V@1A
12HP Panel with power and reset switches
6502 CPU Board original Acorn board with COS40 in 2532 EPROM
Keyboard, Display & Cassette Interface Board trev_ham replica
40x25 VDU (Teletext) Interface Board original Acorn board
UHF Modulator hand wired board
Versatile Interface Board original Acorn board
8K RAM + 8K ROM Board original Acorn board with 8K RAM, BASIC and FP in 2532 EPROMs
8K RAM + 8K ROM Board original Acorn board with 8K RAM
5 spare slots  
4HP blanking panel  


The CPU Board is fitted with COS40 in a 2532 EPROM, the first memory board is fitted with BASIC and FP Extension in 2532 EPROMs, the two 8K RAM boards provide continuous memory from 2000 to 5FFF.

All fitted in an original Acorn System Vero Card Frame with my replica 12-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 Trivolt 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 2 Rear Photo

You'll spot that I have added some side cheeks to the rear of the case to protect the backplane and wiring.

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