AT8+ Gallery

Products of the Chase Group

I was able to obtain an AT8+ board in superb condition from eBay, serial number 8+03056 (so likely to be the 56th sold).

The breakout box and connector

When we first located the 78-way plug and socket the pair constituted the single most expensive components on the board. Before the production was outsourced to a factory in Scotland every connection here was soldered by hand and a test job was constructed to confirm that everything was correct.

The Breakout Box
The Breakout Box
The 78 Way Connector
The 78 Way Connector
Underside of the Breakout Box
Underside of the Breakout Box
The 78 way Socket
The 78 way Socket

PCB Front Side

The PCB is copyright 1989 but the build date is probably the 91/25, the 25th week (or day / batch) of 1991. The board is in lovely condition for being more than 30 years old! The firmware is V4.02, I’ll post a copy of it here in Intel Hex format soon.

PCB showing the ROM and RAM chips
PCB showing the ROM and RAM chips
Front (top) side of PCB, centre
Front (top) side of PCB, centre
Front (top) side of PCB, left side
Front (top) side of PCB, left side
Front (top) side of PCB, centre detail
Front (top) side of PCB, centre detail
Front (top) side of PCB, right side
Front (top) side of PCB, right side
Front (top) side of PCB, entire
Front (top) side of PCB, entire

PCB Rear Side

Note the initials of the hardware designer here, Frank Budd, employed as a contractor when new board designs were required.

Back (bottom) side of PCB, right
Back (bottom) side of PCB, right
Back (bottom) side of PCB, centre
Back (bottom) side of PCB, centre
Back (bottom) side of PCB, left
Back (bottom) side of PCB, left