28 Jul
2020
28 Jul
'20
8:11 a.m.
On Jul 28, 2020, at 10:35 AM, Jay Jaeger via cctalk
<cctalk at classiccmp.org> wrote:
On 7/24/2020 1:36 AM, Boris Gimbarzevsky via cctalk wrote:
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.
paul
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 ...