RE: Hardware emulation of 6509 using 6502?

Hallo Jim,


> > The question is which devices do depend on this?
> Ruud will have to answer.

I only can give you two examples:
- a memory expansion card for the ISA port with SRAM instead of DRAM. My 65816 equipped VIC-20 with ISA expansion would not recognize it.
- my debugger, http://baltissen.org/newhtm/debugger.htm . It is able to single-step a computer. When stepping, it shows the momentary address and the data on the bus. 
In this case the data was garbled on the display although the VIC-20 ran fine. When I found out what the problem was and had it solved, the display wasn't garbled anymore and the card was recognized.

OK, here was self-built hardware involved. But for me it was anyway a good lesson that if you emulate something, do that as good as possible.


Met vriendelijke groet / With kind regards, Ruud Baltissen

www.Baltissen.org




 

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