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Found 14 results

  1. Hi, I bought Macintosh Plus (with 2.5Mb of ram) with CMS external SCSI hard drive, i also bought sealed and new system 6.0.8 floppy disks, i installed them on CMS external hard drive; when i open scrapbook or control panel or file manager, co-processor not installed error pops up, it keeps happening every time i open scrapbook or control panel or file manager. Please help me.
  2. TechEdison

    Retr0Bright Questions

    This coming summer, I will be doing a Retr0Bright treatment on my Macintosh Classic and Plus, including keyboard/mouse. I've got a few questions on methods, so I can end up with the best possible results. -Should I remove the little apple emblem on the front? If so, how do I re-attach it when finished. -Is the original color really nearly white, because after looking at an even slightly yellowed case, it doesn't look right... Looks too "bright" -What's the best method for cleaning/whitening/Retr0Bright-ing the Plus's keyboard and the ADB keyboard/mouse for the classic. Should the keys be removed? What's the best way to do this. -Removing internals... Insulated screwdriver+alligator clips to discharge the CRTs, and then disassemble it, correct? -The plus has a 20SC hard drive, which definitely needs Retr0Bright. Briefly looking it over, it doesn't look straightforward to disassemble, am I missing something? I think those are all the questions I have right now. If there's any other tips or information, I'd love to know that too. As I slowly build a collection, my plan is to have each item look, function, and feel brand new.
  3. steven6502

    Looking for Mac Plus KB and mouse

    I am looking for a macintosh plus keyboard and mouse. Don’t care about looks just care if they work. I would prefer to get them in one deal but I am happy to buy them individually.
  4. sigtau

    Sad Mac (Plus, Rev 2 ROM)

    Thought it would be better to have a separate topic so anyone finding this by search/Google could see it more easily. I installed four 9-chip, 30-pin 1MB SIMMs into my newly built Plus, and when it boots upon performing its RAM test, I get a Sad Mac code 030ff0. Googling around indicates the first byte (03) indicates a memory failure, and the latter two bytes indicate which chip failed, although since it's a set of SIMMs that isn't a terribly helpful number. I have several sets of this type of RAM laying around and I've tried different combinations and it doesn't work. Occasionally, the error offset may change to something like 030400, but that's still a memory failure error code. Resistors R8 and R9 are clipped and pulled aside to enable detection of high-density SIMMs. I'm going to try resoldering it and installing four 256K SIMMs to see if that fixes the issue. The board has been cleaned on a hot (no-detergent) dishwasher cycle as of two weeks ago and no shorts, scratches, or defects are otherwise visible. Note that the board arrived with the resistors already clipped, so I have never seen the machine boot with any different RAM configurations. I'm making this thread mainly to ask if there is anything else I can try, any chips I should inspect for faults, and if there are particular types of SIMMs that I should look for in the future to mitigate this kind of problem. I've read things about ECC and non-ECC RAM but I don't know enough about RAM to know one way or the other.
  5. Hello people! I recently acquired a Mac Plus while doing a clean out of my grandfather's old factory. The keyboard and mouse were FUBAR, as they had been left under an old can of paint which leaked all over them. He said that there was also a hard drive somewhere, but we couldn't find it. I scrubbed as much old paint of this Mac as I could, and besides from a rather even coat of yellowing, it seems to be in pretty good nick. I took it home and plugged it in, and it made the start up bong and the floppy drive made noises, but the screen never fired up. I cracked open the case and besides some dust, everything seemed to be in relatively good shape. No caps were leaking, and nothing looked corroded. I also discovered that this Mac had 4Mb of RAM. Nice! I came to the realisation that this Mac had deeper problems. I noticed when I found the Mac, that it had LOTS of screen burning, which indicated to me that the CRT as a whole could have just bit the dust, or that the flyback transformer was completely screwed. Further poking around inside the machine also revealed that the CRT power connector looked like it was burned or melted. I thought while I had it open, I'd perform the cap change just in case, for longevity if I ever got this thing working. I couldn't find all the correct caps, so I used some higher volt ones, and there was one blue non-polar one that I didn't change at all. Upon firing this up after the change, it worked! I have no idea why the cap change fixed it, non of the caps seemed damaged in the slightest, I verified this when I removed them. No residue or anything! So now I have a semi working Mac, but I have 2 issues which I'm unsure of how to fix. The computer makes a REALLY REALLY high pitched squealing noise. I think this may be the flyback transformer, but I'm not sure. UPDATE: When I fired up the machine to take the photos in this post, the noise was gone! I'm unsure if it will come back, has anyone else had this problem? It's also VERY hard to insert floppies into the drive. The seem to be stuck on something, I'm not sure what though (I've made sure it's aligned correctly). Also, sometimes when I put them in, the jitter around in my hand like crazy until whatever mechanism in there stops, and I can finally insert the disk! And on top of that, the auto eject doesn't seem to be working, but I'm not that familiar with macs that boot directly from disk, as my other mac (a mac classic) is currently not working AND it has a hard drive. I also have no boot disk to test this machine further. Let me know what you guys think!
  6. Good afternoon all, I have acquired two Mac Plus units of which neither want to boot. I've started with the usual logic and analog board cleaning and recapping to no avail. The most promising combination of boards only achieves a white horizontal line accompanied by noise from the speaker, as seen in this video: Other combinations of board only achieve a flupping noise at various speeds with a blank screen. Nothing seems particularly broken on any of the boards, except scorching underneath the 5W 1Kohm resistor on both of the analog boards, both of which tested open and have subsequently been replaced. I know there are a lot of variables at work here and not having a working system to swap parts and narrow down the problems makes it more difficult to diagnose, but are there any specific areas that need checking/replacing to start off? Thanks
  7. sharpjon

    Bare-metal Mac project

    Hello fellow 68k enthusiasts, I'd like to share a Mac project I've been working on for a bit now. I've been exploring "bare-metal" programming on the original Macs (128k/512k/Plus) and just got around to writing up my initial efforts here: http://jonsharp.net/retrocomputing/bare-metal-macintosh-programming-part-1/ But perhaps more importantly, I'd like to solicit some help in the next stages of my efforts to produce something modestly useful/interesting on the Mac hardware, without any real help from the ROM/System. I've got an 'experimental' branch in my 'HappyJon' repo that carries things further than the initial demo in my writeup. This branch demonstrates a compact font, character and string assembly routines, and the beginnings of porting newlib. And it's this last part that I'm hoping to get some help with. I'm having some difficulty with pc-relative code and linking... Anyway, would love some feedback on this or any other aspect of the project. Here's the repo: https://github.com/jrsharp/HappyJon Thanks all! -- Jon
  8. IlikeTech

    Repairing A Macintosh Plus

    Hello everyone, I recently bought a Mac Plus on eBay, with a power cord. It did not come with a mouse or keyboard, and the seller priced them more then the computer itself. Thankfully, it's PRAM battery had been removed, even though the contacts were slightly corroded. The first time I tried to start it, it came up to a sad Mac with error 038000 on it. I checked and reseated the RAM, to no avail. I recently ordered 4x1 MB ram sticks, and when they come I'll keep you posted. I got it from the state next to mine, so shipping was not a complete killer. It unfortunately is missing the screw under the battery cover, but I think that is all right. I am going to build an adapter for a keyboard and mouse so I can use modern peripherals, unless someone is willing to donate them. I am a young person who is interested in old computers, and trying to fix them. If I get it working, I will keep this forum updated. If anyone has any advice in the meantime, it is very welcome. Thanks, IlikeTech
  9. Does anyone know the pinout of the mac plus logic board to analog board cable? I was wondering if it used black and white composite video.
  10. andy2k68kMLA

    Macintosh Plus Logic board problem

    Hello everyone I'm trying to troubleshoot a 1MB logic board (820-0174-C). It doesn't chime only does what I posted in the video. I tried reseating ram, booting only with 1 stick of RAM, etc. reseating and cleaning hi and lo ROM DIPS. Voltages are good from a good, working analog board. The -5 voltage regulator on the logic board measures okay (-4.999 volts). I hear the TSM DIP can go bad too. Any other ideas as to what might be wrong? Any other guides for troubleshooting the logic board. Please watch attached video. Thanks everyone. trim.524A3B4F-052B-44CA-9011-5E24ED3DEFEC.MOV
  11. pierofirenze

    20SC Hard Disk

    Good morning to everybody, I have found a very nice Macintosh Plus computer complete with its external Hard Disk 20SC that is probably not working. This is the reason why I am here... I would like to ask if anyone know the functionality of this drive. When I switch on the Hard Disk the red led on it will ligth five times, then, if I will switch on the computer the 20SC led will blink again other five times and then it will blink continuosly very shortly, it seems that the the computer is trying to read the HD but it does not work. Does anyboy know what is happaening? And perhaps how to fix the problem? Thanks in advance
  12. Trying to clean the floppy drive of a Macintosh Plus, now every time I insert a floppy it will automatically eject it. Disassembling the 800k floppy drive I realised that when I put a floppy in it, the motor doesn't spin and then the disk is ejected. Anyone know how to repair it? Any help will be appreciated.
  13. Juliet Elysa

    Mac Plus Temporary Jailbar Screen?

    Hey everyone! I'm SO glad I found this forum, I've been reading posts as a guest for a while and just now got around to making an account. Today I pulled my Mac Plus out of my closet for the first time in three to five years. It's sitting on my living room floor at the moment, though hopefully it will have a desk to sit on soon. The closet gets pretty cold, especially during winter, so I was a bit anxious about turning it on, not knowing what to expect. Thankfully it booted right up without any major issues. :b&w: It seemed to think that there was a disk in the internal floppy drive so it tried to eject something that wasn't there, but that (and me putting a few non-system disks, oops!) was the only hiccup. However, I had to turn the Mac on and off a few times since it froze when I tried running programs from the software sampler disk, and I noticed something strange while doing it: For a second before it started looking for a startup disk it displayed a screen like this: After the bars went away the screen grew dimmer and the black part slowly became grey. Then the screen flashed black for a fraction of a second before the computer booted normally. The thing that concerns me most is, the bars took up more of the screen each time I turned it on and off. When I restarted it with the restart button in a system error message the lines didn't show up at all. Can someone please give me an idea of how serious this display issue is/whether or not it's a warning sign of something major and what's causing it? By the way, I have very minimal experience with circuit boards. I can identify things like RAM and a CPU but don't know much about capacitors and other less obvious stuff yet. Thank you all!
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