Faulty ULA with white screen...

Discussions about Sinclair ZX80 and ZX81 Hardware
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bola_dor
Posts: 398
Joined: Wed Oct 02, 2019 5:32 am

Faulty ULA with white screen...

Post by bola_dor »

I had this machine with a video failure, some times booting with a "?" In place of the [K] cursor.. some times with a ghost character opposite to the cursor and a poor quality video output still it suddenly only gave a white screen.. a new ULA fixed it..
So be aware that a white screen doesn't always means a healthy ULA.
Sounds logical as ULA have different functions.. and building the display sync may be preserved in this case..
Ernesto
ZX80 USA, ZX81UK, ZX Spectrum, ZX Spectrum+, ZX Spectrum 128+ UK, ZX Spectrum +2/A, Sinclair QL, CZ1000, CZ1500, CZ2000, CZ1000Plus, CZ1500Plus, CZ Spectrum, CZ Spectrum Plus, TK83, TK85, TK90X, TK95. TS2068. And more to come :D
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