Corey986 said:
...I'm thinking my Dazzler actually works now just not in my sol-20. I have to try it in an Altair....
You can probably resolve why, (other than dynamic ram timing issues) by pulling the schematics of your S-100 boards and tabulating the S-100 signals and polarity for each, looking for conflicts. It really wasn't standard until IEEE-696.
I built a Cromemco Z2 back in 1978 and bought boards from various companies, which probably increased the odds of incompatibility. I had to reverse the polarity of one board's control signal and I had other special boards making incompatible use of the extra pins with poorly defined signals.
I just modified the boards so they'd all work together. I found an unused inverter gate on the board with the bad polarity signal and ran solder tacked wire-wrap wires to fix it (hated having to cut traces but it had to be done). The three signal conflict was tricky but with the 100 pins tabulated for each board I could see the available S-100 pins to make it work.
Generally speaking memory boards seldom cause problems unless they play with the PHANTOM signal. Usually the worst offenders are Display cards and Floppy Disk Controllers (in my case it was a Mini-Term Assoc. MERLIN display and a NorthStar MDS).
I haven't found my S-100 notes, just all my documentation and hardware, so I'll probably regenerate that tabulation some day. As this is the third time I've mentioned in in VCF, its probably time I dig for more illuminating details.
I found 3 Dazzler PDFs on the maben archives... I'll look through them later.
...My Altair motherboards are full...
You may be able to confirm the Dazzler works by thinning the odds of card conflict merely by removing any unnecessary S-100 boards from the cage, leaving only what you need to get the Dazzler tested. If you prove the Dazzler is fine then you can cycle power with the remaining set of boards added in a few at a time until you discover an incompatible pair... then you've got less work tabulating the S-100 signals between those two boards.
Just be careful not to lose track of whether power is ON or OFF when doing repetitions like this. Its a good way to learn a double-check or triple-check methodology for working in situations where a mistake might destroy a card. What you may lose tends to determine how much you need to ramp up safety checking like this.