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Thanks for all the help.
I have about 80% finished with the schematic. I need to find a replacement for the 2N5769 The documentation says this was a "Switching Transistor" but it does not say the switching frequency. But that is the next hurdle that needs to be cleared. I will post the schematic and the board layout when it is finished to make sure I did not make any errors. Also need to get the pin outs for P190. At the moment P190 looks like it is the board edge connector.

All advise is welcome and thanks in advance.
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Raymond Domp Frank
Sent: Tuesday, July 20, 2021 3:28 PM
To: [email protected]
Subject: Re: [TekScopes] Recreating an old board for the 7854
On Tue, Jul 20, 2021 at 09:12 PM, Clark Foley wrote:

Would you believe octal latches? Sorry about that, Chief.

Since we're at it:
It's not 8 latches: There are 8 D-type flip-flops in a '374.
Latches pass the input with one control level (the output follows the input, no clock involved) and latch their input value with the control at the other level, much like an analog sample and hold. Compare 7475 (quad latch).
The '374 uses a clock to transfer the data at the D-inputs to the complementary outputs.
Raymond