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Re: Zeddy displaying wrong characters on screen
Posted: Sat Mar 02, 2024 12:07 am
by Lardo Boffin
Moggy wrote: ↑Fri Mar 01, 2024 11:19 pm
Lardo Boffin wrote: ↑Fri Mar 01, 2024 8:58 pm
Guess the program!
IMG_5789.jpeg
Running through the ChromaSCART.
10 PRINT "HELLO WORLD"
20 GOTO 10
Close but not quite enough letters! It is
10 PRINT “HELLO SINCLAIR ZX WORLD”
Re: Zeddy displaying wrong characters on screen
Posted: Sat Mar 02, 2024 12:11 am
by Lardo Boffin
Moggy wrote: ↑Fri Mar 01, 2024 11:17 pm
A cell from a de-capped 2c184 ULA, the second picture is a cell with the overlay from Sinclair.
I've had one or two that partially failed, membrane keyboard presses causing a crash but with a Memotech plugged in all ok.
Replacement of the ULA cured it so not a board fault.
Great photos!
I have ‘The Spectrum ULA - How to Design a Microcomputer’ book - a really good read! If a little hard going in places if you don’t have an electronics background.
Re: Zeddy displaying wrong characters on screen
Posted: Sat Mar 02, 2024 7:34 am
by msknight
Yes, it is a bit crazy... we digitise so much analogue stuff only to find that the digital processes are running on an analogue system
