Any interest in "newer" hardware, software?

[Brent Hilpert]

Fairchild part numbers trivia following.


On 2020-Jul-28, at 7:35 AM, Jay Jaeger via cctalk wrote:
> My DTL chips have markings like:
> 
> DT uL93659   (Chip type 936)
> F 7016
> 
> DT uL909759   (Chip type 9097)
> F 7013
> 
> (I expect 7016 and 7013 are date codes.  Not sure what the "59" is about.)

The 59 is the temperature range. For DTµL, 59 is 0C::+75C.



On 2020-Jul-28, at 8:11 AM, Paul Koning via cctalk wrote:
>> On Jul 28, 2020, at 10:35 AM, Jay Jaeger via cctalk <cctalk at classiccmp.org> wrote:
>> 
>> 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 936 is DTL.

Fairchild part numbers were a bit of a mess when looked at over their production period.
The part numbers did not readily distinguish between logic families.
Some units had the RTµL/DTµL/TTµL labeling, but that was not always present (the Fairchild labeling there actually is mu/micro rather than u).

Some examples of the mish-mash:
	 901 : RTµL
	 915 : RTµL
	 926 : RTµL
	 936 : DTµL
	 946 : DTµL

	 960 : CµL
	 961 : DTµL

	9007 : TTµL
	9097 : DTµL
	9997 : RTµL

There was often an additional 9 in front of the 3-digit types.
e.g. 9936 is DTµL 936.

Even the 59 suffix for the temp range, mentioned above, was ambiguous.
	59 meant 0::+75C for DTµL, TTµL & CµL,
but 
	59 meant +15::+55C for CTµL.


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

Per the OP's machine, the early HP21xx machines were based on CTµL, for which the main supply is +4.5V.
DTL and TTL chips in these machines ran off that 4.5 supply.