4 Nov
1998
4 Nov
'98
7:42 a.m.
>> I knew someone who built a KIM-1 from
schematics. His departure is that
>> he did it all on the S100 bus. He ran it for a number of years while we
>> were in school together. I need to find out what happened to that
>> machine.
> KIM-1 from schematics ? And where did he get the
> 6530-2 and -3 without taking them from a real KIM ?
> I guess it was more like a KIM alike with
6532's
> (with a bit of additional decoding, changing two
> lines and just not using half of the RAM they could
> work as 6530 without ROM) and a 2716 (also with
> additional address decoding).
I'm not sure how he got around this but I know he
did this at a time when
the KIM was still in production and as I recall he did buy some specific
parts directly from the KIM-1 manufacture. I remember the kim keyboard
being genuine.
Ah ja. The hardest to find parts today are the 6530-x
chips, a multi fonction chip with 1 K mask programmable
ROM, mask programmable chip select, I/O lines, timers
and 64 Bytes of RAM. They are only available by scraping
a real KIM. The nearest replacement is the 6532, witch
utilizes I/O, Timer and 128 Bytes RAM. The I/O is almost
the same - just two pins have to be shortened, but the
chip select is fixed and not equal to none of the 6530-x.
I made a design for a KIM clone years ago, but I never
did build it actualy. These 6530s are just hard to
replace - and if I start to replace, I could also
drop most of the other additional stuff not needed
today, like cassete interface or 50 mA loop, exchange
the direct controlled LED by some 'intelligent' ones
and the and would be a 199x KIM but no replika ...
So where is the sense...
Gruss
H.
--
Ich denke, also bin ich, also gut
HRK