[Libre-silicon-devel] Funding / products )do commodore chips

Hagen SANKOWSKI hsank at posteo.de
Wed May 1 14:46:55 CEST 2019

Hello Ludwig.

On 5/1/19 8:52 AM, ludwig jaffe wrote:
> Hi there is a market for rebuilt commodore 8bit computers.
> E.g. the c64 reloaded mk2 board.
> Here they have ZIF sockets for the valuable commodire chips as they write
> So lets grind and re implement the conmidore chips like
> CIA and VIC and CPU.
> The SID is too complex.
> I would start with both CIA versions as IO chips are at danger for shortcuts
> and foreign currents grilling them.
> So here is a good market in C64 freaks who want to repair their boards.
> What about the apple1 or2 did it have specia lchips?
> Afik apple2 has been cloned and they contain standard logic and 6502.
> So go with the CIA chip mos6526 a or b.
> The 8521 was in c128 ?
> I would use CIA6526 and we need to investigate which a or b sells better.
> Also an IO is simple.
> IIRC it also contains 256byte sram but this should be no problem with the
> advanced semiconductor process compared to the process used by mistek
> in the 1980s 😃

Well, all this Commodore 8bit stuff is laying around at github.com and
elsewhere in the internet. Just google for the chip numbers together
with +verilog or +vhdl - or you looking for the C-One
(https://en.wikipedia.org/wiki/C-One) from *Jeri Ellsworth*. You'll find
the sources for sure.

I guess, it could be a good starter to jump into real world design -
play with it, and as soon as we got our technology flying you can
implement them in LibreSilicon.

Do not hesitate, prepare yourself by education.


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