Questions - Setting up a SRAM board in S-100 / Altair system? Banks vs. Blocks?

Hi Brent & all, The board is loaded with 4116s for a total of 64K. It has the EX2 48K PROM chip, and the DIP switches are currently set as you suggested (all ON) - that's also the same setting I arrived at. I also reverted the cut & jump changes discussed earlier, the ones related to clocking and using the board in non-SD Systems enviros. And yes, I too caught on to their particular use of terminology... banks vs. pages vs. groups, etc. Did prove confusing for a few moments, though. So then I decided to go on a fishing expedition... and hooked a single dead 74LS30, U19. That has now been replaced. I've also tested all of the 74LS00, 74LS02, 74LS10, 74LS20, 74LS14, 74LS244 and 74LS373 types, all are fine. Then I got tired of testing chips.. I'll have to figure out the other ones later.

Being pretty new to all this, I can tell you that reading datasheets and devising tests for 74XX series ICs is a very good way to learn your way around the world of digital logic - it's actually been a very helpful series of learning exercises.. far better than listening to a lecture or reading a textbook. Man am I glad I picked up & repaired that proto / trainer chassis.. dang thing has really been coming in handy! Do you have any idea who made/sold it? It's pretty similar in concept to a Heathkit ET-3200, but way more versatile. Based on the workmanship (the occasional lack of..) I think it was built by a student, probably as part of a tech school course, or maybe a mail correspondence course? Either way, it's a decent piece of equipment and it works great after going through it - https://nerp.net/~legendre/altair/photos/proto-trainer.jpg