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2020-10-10 19:33:46 +02:00
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@@ -8,5 +8,8 @@ There is no ULA needed for this clone, as all the ULA logic is replicated with m
Its also possible to fit several (different) code images into the 32K ROM, and it is possible to add switches to select one image to boot with.
Extra logic was added to simulate the same cassette loading screen patterns as a real ZX81 has.
The cassette loading input logic has been eenhanced to give perfect cassette loading behaviour, even whith cassette signals generated with a laptop, for easy cassette loading.
The ULA replacement logic is ferfect enough to enable the use of games which use various enhanced highres graphics techniques to work flawlessly.
The ULA replacement logic is perfect enough to enable the use of games which use various enhanced highres graphics techniques to work flawlessly.
In fact the ZX81+38 clone is easy to build, and a joy to use.
Warning: The revision 1.4 version of my ZX-81+38 contains some errors, and will NOT work as is. The main reason being that the WAIT generator flip/flop idea doesn't work, and must be replaced with a working wait circuit. I have at the moment I wrote this already designed a revision 1.5 version where all known errors are repaired. I will upload new schematics, production files (gerbers etc) aand BOM soon.
And will upload kiCad files after I know revision 1.5 is working well.