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Looking for Mini-mapper PCB (1MB SIMM in VG8235/20)

By hansgoos

Rookie (17)

hansgoos's picture

17-07-2021, 12:34

Hi All,

I want to expand the memory of my Philips VG8235/20 using the manual Hans Oranje made: https://hansotten.file-hunter.com/uploads/files/1mbnms8245e.pdf

For this I need a ' mini-mapper circuit' and ' CAS selection circuit' and I'm wondering if someone has PCB schema's for those circuits.

Thanks in advance.

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By roadfighter

Champion (453)

roadfighter's picture

21-07-2021, 05:29

Hi,
Did you write Hans Oranje a mail?
info@hansoranje.nl
Maybe he has some left ?

By Gregory

Master (224)

Gregory's picture

22-07-2021, 12:33

roadfighter wrote:

Hi,
Did you write Hans Oranje a mail?
info@hansoranje.nl
Maybe he has some left ?

I did also asked that question at Hans and the answer was no.
But the schematics or PCB layout are available for the minimapperprint and CAS-print.
The CAS print goes underneath the ROM of the mainboard... Which ROM or IC is this? It isn't specified in the document.