Recent content by cbmeeks

You're welcome. I like to help out when I can as well. This week has been tough so I hope to get back on the emulator this week. I have lots of stuff working so I'm excited to load up that first disk.

The funny part is that about two weeks before I found the free C128, I bought a really orange, non-working C128 off eBay for about $160 shipped. I knew it was pricey but I wanted another C128. Then I find one that is in pristine condition that works. lol

I knew it had to be you. :) Wait, you got a IIc+ from a thrift store? That's amazing. I have two IIc's but they are the normal ones. However, they have been upgraded. One of them came with an internal Z80 card with 512K of RAM that the seller didn't know was in there (nice little surprise)...

HEY! Is this the same potatohead from the Parallax forums?? If so, you really should write a book. You have helped me more times than I can count. Thank you so much for coming over here. I see you have several posts in a row. I'm going to copy them all out and read them over and over. I've...

Thanks to everyone for the detailed information. I have been doing a lot of reading on this and it's starting to make a little sense. This book really nailed it for me. The explanation on the adjacent bytes really helps. Thanks!!

One idea I had was to take the already rendered monochrome line I have in memory and "double parse" it to render the colors. More to come. :-) I have a large collection of Byte magazines including a mint issue #2. All of them are in a climate controlled closet where I have nearly 50 vintage...

Not only will I read that article, I will read it from my physical copy. :-D

Thanks. I will check that out. Yeah, the half-pixel shifts are throwing me off. I also found the book "Apple II Computer Graphics" pretty helpful too.

Not sure why that's relevant to my original question but if you must know, I am the original author.

The CPU is emulated. I'm not a rookie. I *am* learning the Apple II platform. Hence my questions.

I've read that article. It's helpful, but it doesn't really explain certain things. For example, for each byte only the 7 lower bits are used. The MSB is the palette bit. But you need two bits for a color. That leaves three pixels in a byte. What about the extra bit?

I'm currently writing an Apple II emulator for fun and profit. Well, for fun anyway. lol Anyway, I'm struggling to understand at a low level how hi-res mode works. Every time I think I am starting to get a handle on it, something throws me way off. For example, on a real Apple IIe, I POKE'd...

Yep. I've gotten so much further with it. I now have it working with GR mode and HGR mode in monochrome. Audio basically works (beep) but it's not quite right.

Thanks everyone. Yes, I found that lesson the hard way. The good news is that my emulator is working. Well, technically. I can run A2, A2+, Integer/FP BASIC, etc. The weird issue I have at the moment is the cursor is not visible. I assume it's because I don't have the flashing characters...

As the title suggests, I am writing my own custom Apple II emulator. Specifically, I want to target the II+ in the beginning. I have the basic text page 1 working and I can send some custom assembly language to it and it works. However, once I try to load an actual ROM file, I get nothing but...