Re: Hardware emulation of 6509 using 6502?

If ram in other banks is not detected the function keys won't be assigned correctly.It won't be a test of the execution register though, since a stock CBM-II doesn't execute code in other banks when running the kernal or basic.
Steve

      From: Michał Pleban <lists@michau.name>
 To: cbm-hackers@musoftware.de 
 Sent: Tuesday, November 7, 2017 2:27 PM
 Subject: Re: Hardware emulation of 6509 using 6502?
   
Hello!

Jim Brain wrote:

> Is there any way for someone to write some test code that would exercise
> the various conditions to ensure I have the Verilog correct?

First of all, can you re-program the CPLD on the PCB, or do you need to
do before you solder it? In other words, do you have to make it right in
one go, or can you correct errors in circuit?

Generally, if you put the thing in the machine and it boots, this is a
good sign that it is partially working. Then you can observe whether it
boots instantly or after some delay - if it boots instantly it means
that it didn't find RAM in bank 1 which would imply that LDA (xx),Y
operations don't work.

Regards,
Michau.





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