Hello hello,
I'm somewhat back, I've been the worst at updating things on here. I've been away for a year and I didn't have what I needed to keep going with this, but now that's not the case :D

So, I've mostly worked on programming and I'm still not very good, Being more efficient at what it does ...

I've had a Tek 2230 for a while. The only thing that's died is the PSU fan. I like it mostly because it works in both an analogue and a digital mode. Analogue meaning it's quick and doesn't look like a slideshow (although some of the newer scopes do great at displaying) and digital meaning I can do ...

... I'm currently running the LCD with an 8 bit data bus and 3 extra lines for the control pins. If I could reduce it down to just 4 bit (send two 4 bit instructions instead of one 8 bit) then I could use the extra I/O on the VIA for exterior control.
Have you considered using an LCD "Backpack ...

A bit of an update:
Balancing projects and college is an interesting experience. I got into electronics because it looked like a great side hobby, but now it's eating more and more time. Although I don't regret it!

I had a few 1602 LCDs lying around and I thought it would be nice to be able to ...

Wow thanks! .ORG, I'm also using the document on http://exifpro.com/utils.html as a reference. I think I've got it figured out, it's really nice! It's nice to see the explanation to the instructions show up as I type them.

Anyone have recommendations for writing programs?
The Kowalski 65C02 editor/assembler/simulator is what I use.

So I got tired of rewriting everything by hand and I thought I would give the assembler a go. I'm a bit confused on the syntax though. Is there a document explaining how the syntax ...

I also think A2 is stuck low. See how the $FFFF near the top turns into $FFFB, and the Reset vector pull is from the wrong pair of addresses for A1 to be the only faulty line.

So another plausible root-cause is due to shorting A1 and A2 together while one was driving high and the other low.
Maybe ...

Looks to me as though A1 is stuck high on the "bad" CPU. The first few cycles show it low, but once it goes high, it stays there. That could indicate the low-side pin driver is blown.
What a shame :( I'll have to be more careful bout static discharge probably. These are so fragile.

I'm working ...

I finally got another set of probes for my logic analyzer. I was going to test them out on one of my boards but when I read the data nothing seemed right. I messed around for about 2 hours before I started the question the working state of the computer. Anyway, when I swapped out the 65C02 it seemed ...

If anyone is interested here is the cash register.
https://www.flickr.com/photos/mnaberez/ ... 018441980/

Very neat, could be useful later on. When would you need to boost the signal though? Would that need to be done if the address lines are very long?

Sorry for the title, I didn't know what to call it.

I was looking at a prototype cash register schematic. Looking at the address lines it is hooked up to some 74244 and then the address lines go to the rest of the system. The enable lines are tied to ground. There is the same circuit on the data ...

There's a normal DIP socket soldered to the board. ZIF sockets are expensive so I only have a few of them. When I am developing, I stick a ZIF socket into the normal DIP socket temporarily. This lets me easily change out EPROMs (or usually my EPROM emulator's cable). I then move the ZIF socket to ...

What's the name of the DIP socket? I have never seen one like it.