Three items for the thread;

I am looking at some Motorola parts that are in my collection.. no idea
what they are, MC791P and MC799P. Date codes of 1970 and 1971
respectively.

I am redesigning cards for one customer that are all populated using
Motorola MHTL logic, which is Motorola High Threshold DTL logic. The
date codes on the parts on the boards in front of me are 1978, but I am
sure that these are the legacy order parts, and the product itself was
designed when the family was new in early seventies. Thousands of these
cards are in service today waiting patiently to be replaced.

I dismantled a Honeywell DDP8 mainframe used in a large building HVAC
control system. Installed in 1969, we removed it in about 1992. It had
paper tape for loading the program. When we killed the power, I opened
up the CPU enclosure. I saw the core memory right away, but much to my
stunned amazement, the hundreds of little 4x4 plug in cards were
populated with 3 to 6 logic parts each that were in a gold plated SMT
package. Refer back to the install date. SMT in 1969. I can only make
one conjecture; they were getting their investment back from military
technology.

I have parts marked with RCA, Signetics, Sprague, GE, and other long
forgotten trade marks. Only another engineer could coo over such mundane
collectibles.

Chris~

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