Thanks for response
Please forgive me but I am a beginner on Microcontrollers.
I only have experience of PIC's and the like!
The PSU's are stable, but well worth another look at them since not paid much attention to them since hooking up the logic analyser (had this thing on the bench for about two weeks, and just getting to grips of how the elements work together!)
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Startup vector is 0xFFFE and 0xFFFF which usually has a JMP to wherever the entry point is.
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Sorry do not really understand this. Is this the start up address that the 6802 first reads?
A13, A14, A15 are the chip select bits so the boot up would read ROM1 (A13-A15 all = 1) address A0-A15 all = 1. Is that correct?
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If you pull the EPROM out, A0 should pulse out if it doesn't trap.
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Again what do you mean? Is it simply that A0 will pulse ON and OFF with E when no EPROM
Thanks for the link, some reading to be done next I think
Regards
peter