Re: MOS8520R4 - 1988 vs. 1991

From: Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de>
Date: Wed, 29 Jan 2020 18:28:39 +0100
Message-ID: <bda08eb7-bdac-4049-45ee-f2e3b3cfa330_at_laosinh.s.bawue.de>
On 1/29/20 6:08 PM, Francesco Messineo wrote:
> On Wed, Jan 29, 2020 at 5:57 PM Mia Magnusson <mia_at_plea.se> wrote:
> 
>> We know for sure that parts like VIC, VIC-II, SID, CIA and the Amiga
>> chipset never ended up in any other companies products.
> 
> VIC was not a great display adapter even by 1980's standards

For the beginning of the 80s, it wasn't bad either. It was able to 
produce color video signals, as far as I know Commodore even had a 
patent on some part of that. It was also able to do bus sharing with a 
6502 which allowed CPU and VIC access to the RAM without getting in each 
others way (no badlines). Many other video controllers of that time were 
not that kind to the CPU or made it extra hard to access the video RAM 
(like the TMS9918/9928/9929 for example).



> Btw, I have a PCB of some device (it has a midi interface, I can't
> tell much more about it) that happened to use
> MOS general purpose TTL clones (like the 7406 equivalent and others
> that were found on some C64 boards too).
> So in some cases, those chips were sold to other companies.

Probably at the height of the TTL supply crisis when they had leftover 
stock.

  Gerrit
Received on 2020-05-30 00:33:21

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