Re: Hardware emulation of 6509 using 6502?

From: Jim Brain <*brain_at_jbrain.com*> Date: Fri, 29 Jun 2018 08:42:49 -0500 Message-ID: <344a4e66-fbb4-5b1e-d7da-f48e1dcbfb61@jbrain.com> · brain_at_jbrain.com

On 6/29/2018 5:34 AM, Michał Pleban wrote:
> Jim Brain wrote:
>
>> Fixed:
>> assign oe_bank =                          r_w & phi2_6509 & ce_bank;
>> Needs to be:
>> assign oe_bank =                          r_w & ce_bank;
> Cool!
>
>>    * CMOS 65C02 still fails to read memory on either board
>>    * CMOS 65C02 passed all tests on v3 board (so, I am thinking the
>> test might not be complete).
> That is really strange. I understand that it does not see any memory at all?
Well, all I know for a fact is the machine boots instantly and the 
function keys have all uparrows displayed on the screen when I press one.

Does your exercise both $91 and $b1 opcodes?  All I can think is the 
reads are working, but the writes are not.

Jim