Any interest in "newer" hardware, software?

Paul Koning paulkoning at
Tue Jul 28 10:11:18 CDT 2020

> On Jul 28, 2020, at 10:35 AM, Jay Jaeger via cctalk <cctalk at> wrote:
> On 7/24/2020 1:36 AM, Boris Gimbarzevsky via cctalk wrote:
>> found a box of old Univac cards which appear to be DTL with individual
>> transistors and then go on to having DTL IC's as well as some old IBM
>> cards.  Used to pull transistors and diodes off these to build my own
>> circuits 50 years ago.  Now, with storage being so ridiculously cheap
>> haven't even come close to making a dent in the capacity of a 256 Gb SD
> I might be interested in boards with Fairchild DTL chips, as I have a
> DTL-based disk controller on my HP 2114 that needs work. Not sure if
> Univac used Fairchild DTL, though. Could you perhaps read off a few part
> numbers whenever you get a chance?
> My DTL chips have markings like:
> DT uL93659   (Chip type 936)
> F 7016 ...

Is that DTL or RTL?  Fairchild originally came out with RTL chips, which had uL part numbers like uL914 (dual 2 input NOR) and uL923 (JK flop) in TO cans with 8 leads.

The supply voltage would tell you; RTL uses 3.6 or so, while DTL uses 6 volts.


More information about the cctalk mailing list