Re: Hardware emulation of 6509 using 6502?

From: didier derny <didier_at_aida.org>
Date: Tue, 20 Feb 2018 22:17:16 +0100
Message-ID: <0a3231d2-bc50-2954-d7e2-325c1c55e682@aida.org>
frankly I just bought a cbm 710 board and was thinking to try to make 
adapter

something like 6502 + cpld

in the cpld the code to trap the 2 opcode  sta ($addr), y and lda 
($addr),y using sync

normally one of the registers  0 or 1 I dont remember (execution) is 
always on the bus

the second is inserted temporarily during these instructions...


I'm thinking to a replacement for the 6525... I'm looking for them, hard 
to find :(


On 20/02/2018 22:11, Mia Magnusson wrote:
> Den Sat, 4 Nov 2017 17:14:15 -0500 skrev Jim Brain <brain@jbrain.com>:
>> On 11/4/2017 3:59 PM, Michał Pleban wrote:
>>> Jim Brain wrote:
>>>
>>>> If someone is serious about testing this, I am happy to write some
>>>> HDL to match the circuit in the linked 6502.org posting.   It's
>>>> pretty simple.
>>> Sure, I can pop this into my 710 to test it.
>>>
>>> Regards,
>>> Michau.
>>>
>>>
>>>          Message was sent through the cbm-hackers mailing list
>> I'll order a PCB.
>>
>
> Any updates on this? :)
>


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Received on 2018-02-20 22:02:02

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