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Everything posted by cbmeeks

  1. Sega should have done what Atari did and just add up all the bits. The 68K with it's 32-bit registers plus the 16-bit address bus of the Z80. So the Genesis is a 48-bit system. LMAO. At least they had Blast Processing.
  2. Yeah, I think the 68000 and Z80's (for sound) are some of the most popular arcade processors from the 80's/90's.
  3. Oh yeah, huge fan of the Parallax forums. Yeah, I've heard of the MiSTer project. I don't want to use FPGA for the CPU. At least not at first. I will be using FPGA (and/or CPLD) for glue and video but not the CPU. Unfortunately, the project is on temporary hold as we just bought a new house! We are moving first week of September so my entire lab is in boxes right now. lol But I will keep everyone posted.
  4. I haven't decided if the CPU and framebuffer will share RAM. My initial thought is that they would. I don't really want to get into anything like cycle stealing/stretching or anything like that. My intent is to upgrade this machine to '020/030 one day and that method (like the original Mac) is less relevant on those machines. Especially when you start getting into SVGA resolutions/colors. The 10ns SRAM (16-bit) was surprisingly cheap so that's why I wanted to use those. And I figured 10ns wouldn't be any kind of bottleneck for anything I could every dream to design.
  5. Small update... This weekend was unproductive. I had FOUR large deployments (for my real job) that took up most of my weekend. I did manage to solder the small QFP-64 68SEC000 to a breakout board. This breakout board will next get 64 wire-wrap pins soldered to it so that I can use it. Next after that is free-running it. Someone asked what OS. Well, at first, I *might* try uLinux just to get it running. But my goal is to develop my own OS. But that is a tall order. Either way, I will keep people posted. Thanks.
  6. Thanks everyone for the interest. I don't have a blog yet. But I really should start one. I really like the format that BMOW does with his projects. I might follow something similar. I'll either post my progress here (if no one objects) or just post a link to my eventual blog. In the meantime, I gathered up parts that I already have on-hand. My dream is to design a "Mac like" computer that would fit between the Mac 512K and Amiga 500. Closer to the Mac because the Amiga had advanced chips for it's day and I'm a HDL newbie. I will be wire-wrapping my fi
  7. I'm sorry if I am way OT here. Last year, I designed a 65C02 computer and had some boards made. It worked very well and I was very happy. My next move was to design his 16-bit big brother using a 65C816. Seemed like a logical choice (still is, really). However, there was something pulling me towards the 68K. Mainly because I was a hard-core Amiga 500 user in the day. And, about 20 years ago, I started collecting classic Macs (I have several 68K series Macs). So I decided to byte the bullet (notice a play on words there) and design my first 68K based
  8. Holy crap...I forgot I have one of those Apple II 3.5" drives! I got it with my IIgs years ago. So, is it easier to transfer disk images over to it than 400K disks? Your blog is looking good. Do you plan on doing any posts about how to transfer images over to those disks? My primary PC is a Windows 10 machine. I also have a bunch of disks for the Amiga. I wonder if I could take a couple of them and format them for the Mac 512K?
  9. Yeah, I may be interested. I will send you a PM. Thanks!
  10. I've tried 15 times to upload more pics but all I get is an error message. Even pictures much smaller than the ones that worked. Not sure what that's about. https://www.dropbox.com/s/72u5g2aa1b64lab/Photo Dec 08%2C 2 14 01 PM.jpg?dl=0
  11. Some pictures of my new setup.... Half of the pictures would not upload for some stupid reason.
  12. Spiders are smarter than other insects. They like to "think different". What I hate finding in old computers are blood stains and rat turds. lol (yes, found both).
  13. So I just bought a (new to me) Macintosh 512K for $60 (USD). It came with the 512K (dur), keyboard (original), mouse (IIc mouse) and 400K external floppy drive. Oh, and a non-Apple bag to carry it all in. The computer has a small crack in the case on the top-right but I think I can eventually fix that or even replace it. It's also VERY yellowed so I got some retro-brighting to do. I will post some pictures later. The first thing I do is power it on. The seller showed a picture of it working. I don't have any software for it so all I got is the disk wi
  14. I confirmed that you were correct! It indeed worked on my new Mac 512K. Thanks
  15. Will the Apple Mouse IIc work on a Mac 512K without any adapters or conversions? I finally have one and I may swap it out between my IIc computer and my new 512K. Thanks!
  16. FYI, my wife won a new (modern, 2016) laser printer at an office party a few months ago. It was made by Lexmark (I can get the exact model if interested). Anyway, it's an awesome printer supporting networking (wired) and USB. But what really surprised me is that it also had an old-school an IEEE 1284 36-pin Centronics printer port! I couldn't believe it. But I guess there's still a lot of old business machines out there without network or USB. Anyway, I wonder if it would be easier to get one of those running on a vintage Mac than running a RPi/Linux layer in between?
  17. I'm certainly no expert in things 68K Mac, but from what I've read, couldn't this memory upgrade be "sanctioned" from Apple? IIRC, Apple offered a $995 upgrade kit for 128K to 512K Macs. Also, I remember reading that even the very first 128K Macs had support for 19 address lines on the board so 512K could be addressed but you had to do weird stuff like piggy-backing DRAM's. I can't remember where I read that. But Jobs only approved of the 128K (17 address lines) so they secretly put the extra two on anyway. Either way, that's a good find. I just bought a
  18. Hmmm. That's an idea. I had thought about filling it with epoxy, sanding and painting the case. Seriously, since this thing is so yellowed, it might be a good candidate for painting. If I could find the original color. However, my painting skills are not that great. I'm going to retrobright it either way. If I can get it to a good shade, I might just live with the crack. Maybe. I may try taking it to some autobody shop and see if they would paint it!
  19. I just got a 512K Mac with keyboard, mouse, external floppy and carrying case for $60. I'm very excited. Other than having SEVERE yellowing, there's a 1" or so crack wrapping around the top-right of the case. On the front bezel (not the main case). So, any ideas on how to fix that? I don't mind a few dents and scratches but that crack really keeps pulling my eyes towards it (no jokes please...lol). Anyone have a front bezel for sale? Thanks!
  20. When I boot my SE/30, I get a screen with horizontal stripes. Nothing else. No beeps, either. First thing I did was recap the logic board. I believe I did a good job but I can double check (even though I've triple checked already). Tonight I replaced UE8 (74LS166) with a new one. Actually, I only had 74HC166 but I think that should work. After I replaced UE8, I still get the exact same thing. Nothing changed. Any ideas? Thanks!
  21. @Alex Yes, I mean the internal metal frame that holds the motherboard, drive cage, etc. You can't see from the pics above but trust me when I say it was beyond repair. I mean, I guess it technically could be rebuilt. But at least half of it or more was rusted all the way through. I don't think it was just battery leakage. I think it was full blown rust. The rust was so bad that I could break off large pieces of the frame with my fingers. It wasn't something that could be scrapped off.
  22. I believe the 8-Bit Guy tried it with his Mac Plus and never got it to work. It would be interesting if you managed to do so.
  23. Those are both good ideas. Finding an LCD screen would be great because that opens a lot of doors for some cool stuff like an FPGA Mac Classic. Too bad they never made a 15" widescreen Mac Classic back in the day so that I could use this VGA monitor I have. But then the Mac would be "T" shaped. lol
  24. Do you have an example of that? That sounds dangerous and exciting. lol
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