Apple II

On a related note to the question about squares, I'm a little confused by the "color" word :). Specifically as applied to the iie. I like the visible computer program that shows how the 6502 works from the inside out (the apple/commodore program, not the modern thing). But, it "works" in color, which means it comes up like this:

I wanted a ROM card to round out the  toolset and picked this up on ebay. Arrived today and I realized it was more than a clone of the apple integer rom card. More chips. Looking at it, I <think> you can install diodes on the pads on the lower left to selectively enable specific ROM chips. 

Anyone got documentaion on this? I looked on Apple2.org and they had a front photo but nothing else. 

Also, any idea why they differentiate between PROM and ROM in the silkscreen (above the pads - lower left)

Cheers

Pete

I just got an Apple II off ebay. It has a broken 4 and Reset key. I thought I could fix the 4 key with a swap of the repeat key but whoever attempted to fix this keyboard broke a lot. Many of the little plastic pieces that hold the metal switches (not ALP like swithes) are gone. So alignment is tough. I may take some thin nails and use them as guides. The though hole for the 4 key shaft is messed up. I couldn't get the repeat key shaft into the 4 hole and I can't see where the exact problem lies yet.

Hi all,

Fresh off of a forth deep dive, I'm looping back around to  the 6502 and my platform for doing the investigation is the apple iie. I really like the iie as platform, primarily because it's immediate (boots directly into basic) has immediate access to the monitor (call -151) and it's just cool - takes me back to my commodore pet, but more polished, and because in 2025, there is so much documentation, books, you name it. The resources are astounding considering the iie came out 40+ years ago.