Hi All,
Cool TI Micro terminal on ebay for the 990 family
Item # 300432266833
Rob
Rob Borsuk
email: rborsuk at colourfull.com
Colourfull Creations
Web: http://www.colourfull.com
> I have brought my SWTPC 6800 system back to life that I built as a kid
> in 1976. It is pretty heavily loaded with RAM cards, floppy controller,
> etc. and the 8V power supply rail was never really able to hold its own.
> It sits at about 6.5V now... driving many 5V regulators on the various
> cards. No where near enough margin going into those.
>
> So, I am contemplating the following,
>
> 1) rebuild entire power supply using three switchers, 7.5v unit nudged
> up to 8V and two 12V units to supply ?12 on the backplane. <snip>
>
> 2) add a new transformer to the existing supply just for the 8V rail.
> <snip>
> 3) scuttle the legacy RAM cards, most of which are 4K in size built
> with 2102's... and one 16K built with 2114... and replace them with a
> single homebrew RAM card using one 32Kx8 SRAM drawing almost no power
> in comparison to these old cards.
>
> Any recommendations on the best choice?
>
> Chris
>
>
Chris,
If you're planning on using the system somewhat frequently I suggest
making the newer RAM card, keeping the power supply as-is, and saving
the old RAM cards for the future in events where you want the original
system intact. Best of both worlds.
Bill Degnan
