I've owned a beeb for >35 years and many machines in between but last week made a cheeky bid on an atom and was very pleasantly surprised to have won.
The machine as turned up and is in fair good nic. It needs a clean etc but you can tell it's been looked after.
Included were the original manual+schematics, books, spare chips of many sort plus a tape. It didint' come with a PSU but have sourced a modern 5v 2A which should come soon. I've already checked the LK6 LK7 and the machine is already set for 5v.
The machine has been modded a fair bit but am trying to work how what. I can see some piggybacked RAM chips and adding all the chipsl up I count 14K.
The bit i'm trying to work out are two switches that have been fitted to the rear of the case.
Right Switch - 3 wires
- IC44 (SN74LS393N) pin 10 - q1?
IC22 (6502) pin 37 - phi?
IC44 pin 11 - q0?
Left Switch - 3 wires
IC44 pin 13 - CP
Any thoughts gratefully listened to!