The restoration of a 1980's Williams Defender arcade machine
Stargate/Robotron/Joust Board References
1.1 Stargate CPU Boards
540104 – No boot (missing CPU and memory chips) – Rom 5 – (R8948 Revision – Stargate)
542797 – Working Stargate – Rom 6/4 – (R8948 Revision – Stargate)
607225 – Not Tested (4164 Memory) – (R8731 Revision D) [DL]
614204 – No chips and really dirty – (R8731 Revision D)
1.2 Stargate ROM Boards
2.1 Robotron CPU Boards
555248 – Rom 6/4 – (R8731 Revision B) [In Box]
Repaired DL 04/11/2013, upgraded to 4164 Memory with adapter, JAMMA sync inversion switch fitted and track cut 23/05/2014. Tested 100% working
xx5585 (21) – Rom 6/4 – (R8731 Revision B) [In Box]
scrolling black lines, 4 lights. 4116 RAM
2.2 Robotron ROM Boards
????? – Works 100%. Mixed ROMS of Part A (Green) and Part B (Red)?
3.1 Joust CPU Boards
574050 – Rom 6/4 – (R8731 Revision C)
Jail bars and corruption / Green lines. 4116 RAM. New CPU. Decoder replacement D3 and D2 and modified to use 2716s.
574562 – Rom 6/4 – Revision C [In Box]
4116 RAM – Jamma sync inversion cut and board tested. Testing 100% working! 🙂
607953 – Rom 6/4 – (R8731 Revision D) [In Box]
Working. CSync works fine, however there maybe issues using HSync and VSync – need to check in actual cabinet. CR2032 battery upgrade fitted. JAMMA sync inversion switch fitted and track cut 23/05/2014. Tested 100% working
3.2 Joust ROM Boards
47299 – Works 100% Red ROMS
about 10 years ago
Am trying to find someone who can fix/service my stargate
Shaun