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Old 10th Jan 2018, 2:41 pm   #48
Duke_Nukem
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Join Date: Jan 2003
Location: Birmingham, West Midlands, UK.
Posts: 1,268
Default Re: 8085 processor questions

Just a thought, if you have a ROM burner try burning a test ROM with a simple program in it. IIRC you claim not to be a programmer, but a rom with a single op that just went jmp-to-the-start would mean you would expect to see first couple of address lines wiggling whilst the others should not. Knowing that would mean the basics of a working processor were there. Insert a second instruction that reads or writes a specific location and you can then test that.

If nothing else fill a ROM with NOP instructions (0x90 hex), you should then at least see consistant signals on the address line as the processor walks through the ROM.

TTFN,
Jon
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