On Mon, 23 Apr 2018 16:08:25 GMT, Jan Panteltje 
declaimed the following:

>On a sunny day (Mon, 23 Apr 2018 11:51:43 -0400) it happened Dennis Lee Bieber
> wrote in :
>

>>8212 buffer/latch (3x) {meant to be used to capture shared address/data
>>lines, as part of the bus control}

 Mis-counted -- it was 5x, the other two were in a bag (in anti-static
foam), as they weren't needed with the 8228 chip.

>
>And there was the Intel 8272 disk controller chip:
> http://panteltje.com/panteltje/z80/system14/diagrams/fdc-1.jpg
> http://panteltje.com/panteltje/z80/system14/diagrams/fdc-2.jpg
>         But driven from a Z80...
>Then it was already 1984 and that controller was also in the IBM PC.

 The kit I mentioned was (without the supplemental chips) from around
1978, cost $20. My digital electronics III class intended to wire-wrap
computers from the chip sets (badly under-estimated the design time for a
college on a trimester system -- 11 weeks at 2 or 3 sessions a week just
didn't do it. I "wrote" a monitor program for use with a 20-key calculator
keypad and 2-digit LED display)


--
 Wulfraed                 Dennis Lee Bieber         AF6VN
 wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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