[vcf-midatlantic] Memories of 1977

Jeff Galinat jgalinat at gmail.com
Wed Jan 12 22:05:47 UTC 2022

 Hi Joe,
  In addition to the 2114 (1k x 4) and the SEMI4200 (4k x 1) that Bill &
Jonathan mentioned, there was also 4044 type RAM (4k x 1) in a .3” wide
18pin DIP. I know Dennis Dupre of Electronic Control Technology (ECT) used
them in his 16k RAM board dated 1977.
The Digital Research Computers 16k board also used the 2114s.  I only
mention these as I have owned both of these boards.

  It looks like the pin compatible 2147 (4K x 1) was also released in
1977.  The largest RAM boards using these chips I have seen using these
chips is 32k such as the CompuPro RAM20 (1981) or the Industrial Micro
Systems (IMS) 32k board (1978).  There may be others but these came to mind
as I have owned both of them.  These boards are obviously post 1977
although the RAM chips themselves are not.

Best of luck with your design,
Jeff Galinat

On Wed, Jan 12, 2022 at 11:47 AM Joseph Giliberti via vcf-midatlantic <
vcf-midatlantic at lists.vcfed.org> wrote:

> Greetings!
> I'm still in planning stages for my homebrew computer and one of my goals
> is to keep it period appropriate. Part of that is not using any parts or
> technologies introduced later than 1977.
> I want my computer to have at least 32k of SRAM. So, by the end of 1977,
> what was the densest chip commonly available which I won't have to go
> bonkers trying to locate?
> Thanks
> Joe Giliberti

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