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CF30050

Gary C

Veteran Member
Joined
May 26, 2018
Messages
2,641
Location
Lancashire, UK
Does anyone have a spare BBC Master I/O controller CF 30050 ?

Need on to resurrect a sick master 128.

Thanks.
 
How would that work ?

The I/O chip does all the individual chip selects to things like the video processor, the via's etc so while the CPU is running, nothing is coming in or out.
 
Found one on stardot from a very nice person who had bought one but didn't need it and sold it at cost

Had found another fault in that IC21 had obviously removed from an (unsocketed) issue 1 board and there was a solder bridge between pin 11 and pin 10 meaning the CPU ready line was held high all the time but even with that sorted it didn't quite work.

New I/O IC fitted and greeted with 'this is not a language'

Result :)

Just need to add a battery and make up a speaker/rom slot piece in the printer and that's master number 2 up and running.
 
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