Re: Hardware emulation of 6509 using 6502?

From: Jim Brain <brain_at_jbrain.com>
Date: Thu, 28 Jun 2018 18:28:43 -0500
Message-ID: <850066a2-20f1-c8f2-f6b2-24aa1a26e184@jbrain.com>
On 6/28/2018 1:28 PM, Michał Pleban wrote:
> Hello!
>
> Jim Brain wrote:
>
>> The current code will not work on the previous board.  The previous
>> board did not sit in between the Data path.  This one does.
> I understand that, but I just want to look at the current Verilog code
> because otherwise I will have no idea what is causing the errors.
> Generally it looks like the four topmost bits are set to 1 but not
> always (because read bank direct 1 passes OK), without the actual
> hardware in hand I can only deduce the cause by looking at the Verilog.
Working on getting code up online
>
> Also please post the results of the tests from the previous board - do
> they differ in any way from the current board?

Old board:

OK
OK
OK
OK
OK
FF, expected 0F
OK
FF, expected 0F

New board:

OK
Ok
Ok
OK
Ok
FF,0F
F0,00
FF,0F


>
> Regards,
> Michau.
>
>

-- 
Jim Brain
brain@jbrain.com
www.jbrain.com
Received on 2018-06-29 02:00:07

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