Jump to content

macintoshpleasework

6502
  • Content Count

    17
  • Joined

  • Last visited

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    That would be wonderful - Thanks again! It was running system 6.0.8, and seeing as the machine only has 2.5 MB of RAM, System 7 would probably be a stretch anyway. My hope is that having the boot disk will allow me to see if the SCSI drive is mountable - then I can go from there.
  2. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    In an effort to archive the files of the SCSI drive, I connected it up to my G4. This worked well and I was able to copy over all the files. However, connecting it back to Mac Plus resulted in a boot failure - I just get a solid floppy. It seems like connecting it up to the G4 running OS9 has messed around with the apple_driver partition or the boot blocks, so now I am without a working boot, unfortunately - Sorry to say that I may just need that boot floppy after all.
  3. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    So the machine is up and running nicely. Managed to build a mouse using the Raspberry Pi and the code here (https://hackaday.com/2017/01/23/bring-a-modern-mouse-to-an-atari-st/). I'd quite like to upgrade to System 7 on the SCSI. What's the best way of going about getting System 7 installed on the SCSI without floppies? I have a PowerMac G4 running OS9.2 with a SCSI PCI card that recognizes the hard drive - can I use this to install the new OS?
  4. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    It did indeed have an operating system on it, so I should be good to go without a boot floppy. Thanks again for the offer. If the hard drive gives up the ghost, I may come running. That device looks perfect - great build. I'll have a rummage around to see if I have one of those joysticks.
  5. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    It lives!.... I finally got the damn thing to boot. Switching around and/or cleaning the RAM chips seemed to do the trick in the end. The hard drive seems to function well. Now all I need to do is find a mouse - I'm thinking I might DIY something like this: https://hackaday.com/2017/01/23/bring-a-modern-mouse-to-an-atari-st/ As far as I can read, the Atari ST mouse output similar signals to the Mac Plus mouse (just a different pin-out), so a RPi + some code to emulate the old mouse might do the trick. In the meantime, does any know if I can control the plus sufficiently only using a keyboard?
  6. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    WIll do. I actually had some luck with the SCSI hard drive this evening - after taking off the enclosure, it magically started spinning. Starting up the HD followed by the Plus lead to a Happy Mac... wonderful! Of course - the story isn't over yet. The Plus starts to boot, I hear plenty of action during the boot, but it stops after around 30 seconds. The boot unfortunately gets stuck on the Happy Mac, and does not complete...... any ideas?
  7. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    Sounds great. Let me know when you're ready and I can message you my address. Thanks again!
  8. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    That would be fantastic! Please, whenever you have time. More than happy to cover postage. I'm not too sure about operating system - System 7 should work well on this machine right?
  9. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    Thanks for your reply. Yes, it seems like making my own boot disk wouldn't be possible since the Plus is the only machine I have (besides a PowerMac G4). I'm in the UK at the moment.
  10. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    To update on this problem: It seems like it was the ROM. Not having my own EEPROM programmer, I built one with an Arduino following this great tutorial (see youtube link below). Reading the ROMs revealed som flipped bits on the 3420342a LO-ROM. Using the ROM images found here (https://www.nightfallcrew.com/25/04/2014/macintosh-plus-sad-face-repair/) I reprogrammed the offending ROM onto a new pin-out compatible W27C512-45Z chip (https://www.digikey.co.uk/product-detail/en/winbond-electronics/W27C512-45Z/W27C512-45Z-ND/1133334) Putting this new ROM in the Mac resulted in only a single bong, and then to my amazement, the 'no boot disk found' floppy symbol. I don't have a boot disk available, but I do have a Prodrive40 harddrive. Plugging this in and turning on prior to boot doesn't result in any progress passed the 'no boot disk' symbol - so maybe no operating system is actually installed on it. Any tips on diagnosing this further would be great, or if someone has an easy way I can get hold of a boot floppy? Thanks in advance!
  11. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    Still no luck with the Mac Plus - bong, bong, bong. I have gone over the AB again, reflowing everything that looks suspect. Voltages still look good at the floppy port. I don't really have the kit to go poking around on the LB, but this may be what is necessary for this machine. There are a couple of the previous posts that point to the RESET circuitry (http://www.vcfed.org/forum/showthread.php?64106-Mac-SE-Checkerboard-pattern-after-cleaning-battery-leak/page2 , https://www.eevblog.com/forum/repair/macintosh-plus/), but not sure where to start with that. Any ideas welcome!
  12. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    The sound I am hearing is not a ticking, just a the bong over and over again. I have reflowed J1 with fresh solder and cleaned the contacts. Still the same issue. The issue seems similar to that mentioned here - where 'The problems was the two ROMs on the logic board and the JFET Q5 on the vertical sweep.' https://www.eevblog.com/forum/repair/macintosh-plus/
  13. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    Thanks for your responses. dochilli - No access to an oscilloscope, unfortunately. Regarding the buttons, pressing the interrupt has no effect on the repeated bong. The reset button stops the bongs during the press, but they restart as soon I let go of the button. Thanks
  14. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    Just to update on this: Removing, cleaning, and reseating the RAM had no effect on the boot chime loop. Voltages are still stable at the Floppy output. Any ideas much appreciated.
  15. macintoshpleasework

    Macintosh Plus (M0001AP) boot chime loop

    Thanks for the response. I checked the output at the external floppy (as detailed here https://www.classic-computers.org.nz/blog/2015-05-14-mac-plus-checkerboard.htm ) and I got a stable 12.3 V on pins 7,8 and 5 V on pin 6. Does this point the finger at the logic board (SIMM possibly)? Thanks
×