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 Message was sent through the cbm-hackers mailing listReceived on 2017-03-28 19:00:02
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