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need help on ULA6C001

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rank44

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can any one give me ifo of the ULA6C001 for Z80 Spectrum I can not fine a PDF on the web site yhaoo or google
 

yura717

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Can be replaced by 5C112.
 

RetroTechie

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Nope... the other way around is usually fine though.

Check issue number on the Spectrum circuit board (silkscreen "ISS 4B" or something like that), download schematic for that issue ZX Spectrum **broken link removed**, schematic has pinout for the ULA.

Beyond that: official documentation for the ZX Spectrum ULA doesn't exist, but Chris Smith has done extensive reverse engineering for his Harlequin project (even available in book form!).

P.S. check my site if you need to replace the lower 16K RAM :)
 
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