Re: Mistery expansion

From: Richard Lagendijk <r.lagendijk_at_hccnet.nl>
Date: Tue, 28 Mar 2017 20:43:27 +0200
Message-ID: <1db763ac33381c75871e5a660e12a705.squirrel@webmail.hccnet.nl>
Op Ma, maart 27, 2017 21:06 schreef Christian Dirks:
> Am 27.03.2017 um 08:24 schrieb Richard Lagendijk:
>
>> Op Ma, maart 27, 2017 01:00 schreef Christian Dirks:
>>
>>> Am 26.03.2017 um 16:10 schrieb Richard Lagendijk:
>>>
>>>
>>>> I'm organising my collection and I found an expansion. But I do not
>>>>  know what it is. It has 8 RAM chips and a lot of logic ICs. No
>>>> markings on the PCB (could be home-made). It was in a box with other
>>>> PET things.
>>>> http://www.richardlagendijk.nl/div/mistery_expansion_pet.jpg
>>>> Does anybody has an idea?
>>>>
>>>>
>>>
>>> Looks very familiar to me.
>>> Seems to be one of the many bootlegs of Helmut Proxas MW8160/8096A
>>> boards, a 64k expansion for the 8032. It plugs into the 6502 socket,
>>> and the 6502 plugs in the board. It is compatible to the commodore 64k
>>>  expansion, which makes a 8032 a 8096, and has some additional
>>> features. The original version from Helmut allows stacking another row
>>> of 4164 on it, to get a 8160 (32k + 64k + 64k = 160k).
>>>
>>> I sent Helmut the link to have a look at it.
>>>
>>>
>> Yes, on the bottom side of the PCB there is a socket that can connect
>> to a 6502 socket on the motherboard. The cable connects to the 5VDC
>> regulator on the PCB.
>
> Helmut thinks it's a bootleg of his board.
> He would like to see some more detailed pictures,
> also from the solder side.
>
> Could you lift the 74LS241 out of the socket?
> There may be solder jumpers, which Helmut implemented to set a serial
> number for use as a copy protection.
>
> Christian
>
>
> --
> Christian Dirks
> Toast_r@Idealine.info
>
>
>
I took more pictures of the PCB on both sides and with the 74LS241 removed

http://www.richardlagendijk.nl/div/mistery_expansion_2.jpg
http://www.richardlagendijk.nl/div/mistery_expansion_3.jpg
http://www.richardlagendijk.nl/div/mistery_expansion_4.jpg
http://www.richardlagendijk.nl/div/mistery_expansion_5.jpg

Greetings,

Richard

-- 
www.richardlagendijk.nl


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Received on 2017-03-28 19:00:02

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