I've got some 4116 chips from retroleum.co.uk. They appear to be TMS4116-15NL so according to http://www.primrosebank.net/computers/m ... txvram.htm they should be fast enough.
I'm reading through the service manual and also http://www.primrosebank.net/computers/m ... repair.htm and http://www.primrosebank.net/computers/m ... _fault.htm
Display issues with MFX 40 column basic
Re: Display issues with MFX 40 column basic
Good luck!
Steve G
Danish Memotech MTX 512, MFX and loving it
Danish Memotech MTX 512, MFX and loving it
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davesnowdon
- Posts: 20
- Joined: 01 Oct 2023 21:54
Re: Display issues with MFX 40 column basic
Victory!
I ended up replacing 3 4116s. I tried checking for overheating chips but didn't feel any obvious differences. I ended up grounding pin 14 of each VRAM chip in turn via a 15 ohm resister and found 3 with dodgy bits. De-soldered those, fitted some sockets and it worked first time with the replacement 4116s.
Thanks Dave and everyone else for the help and encouragement!
Wishing you all a Happy New Year!
I ended up replacing 3 4116s. I tried checking for overheating chips but didn't feel any obvious differences. I ended up grounding pin 14 of each VRAM chip in turn via a 15 ohm resister and found 3 with dodgy bits. De-soldered those, fitted some sockets and it worked first time with the replacement 4116s.
Thanks Dave and everyone else for the help and encouragement!
Wishing you all a Happy New Year!
Re: Display issues with MFX 40 column basic
Happy New Year to you too.
Great stuff - well done!
Great stuff - well done!
Re: Display issues with MFX 40 column basic
What he ^ (Dave) said.
Well done
Mark
Well done
Mark
Standby alert “There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Autumn is here. Bye bye summer 2024...
Not as many MTXs as Dave!
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stephen_usher
- Posts: 341
- Joined: 27 Nov 2016 19:58
Re: Display issues with MFX 40 column basic
4116 chips are always dodgy!