Kryoflux or Catweasle

allison allisonportable at
Wed May 24 14:49:01 CDT 2017

On 5/24/17 3:35 PM, Chuck Guzis via cctalk wrote:
> On 05/24/2017 11:19 AM, ben via cctalk wrote:
>> But who wants to write the software?
> Yes, just so.  I learned about that one decades ago.
>> I am building a 1977 ttl style computer because now I have spare time.
>> Finding vintage or similar devices is being a challenge as well fighting
>> modern OS to have even a C compiler and a TEXT editor.
>> Technology is not better, just cheaper
> Modern technology is not only cheaper, but it's faster and uses less
> power--and is usually more flexible.
Its why I keep all my old machines.  We have an understanding, that is I
understand them fully, hardware and software.

Oddly the assumption is 16 bit, PDP-11, why not DG Nova, TI990.
Could easily be 8 bit, 12bit, 18 bit as well.

> I suspect that a PDP-11 in FPGA is quite a bit more reliable than the
> real thing--and when you're done you have a nice abstract description of
> the hardware in VHDL format.
> And yes, I have a pile of old CMOS/ECL/TTL logic.
And Germanium transistors...

> Remember when CMOS logic was new-- +15V Vdd and 1MHz top speed?
> --Chuck
I remember when RTL was new and uRTL was a later improvement.


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