Jump to content


  1. Important Information

    1. The 68kMLA Forum Rules   (6858 visits to this link)

      To quote vintage Apple manuals: "Read Me First!"

  2. Community Connections

    1. General 68kMLA News & Stuff

      What's going down in the barracks.

    2. Conquests

      Discuss your latest vintage Mac finds!

    3. Trading Post

      Feel free to trade all of your Mac goodies here with all honest intentions. The website provider assumes NO liability, so buyer beware! Please see this topic for more information.

  3. Projects & Hosted Forums

    1. RetroChallenge

      What can you do given only one month and strictly "retro" hardware? Find out with RetroChallenge!

    2. 68kMLA Wiki

      The creation and maintenance of the 68kMLA's information repository.

  4. 68k Model Forums

    1. Compact Mac

      Macintosh, 512k, SE, etc.

    2. Mac II, Quadra & Centris

      Just think, having a Quadra 950 in 1992 would be like having a Mac Pro today… except with more slots, more expandability, and on-board SCSI!

    3. 68k LC & Performa

      Ah, the consumer computers!

    4. 68k PowerBook

      From the Portable to the 190cs.

  5. PowerPC Model Forums

    1. NuBus Power Mac, LC & Performa

      The NuBus architecture gets a new brain!

    2. PCI Power Mac & Performa

      The PPC comes of age and adopts the industry standard expansion slot.

    3. G3/G4/G5 Power Mac, iMac & eMac

      From the Beige G3 to the quad-core G5, via various iMacs!

    4. PPC PowerBook & iBook

      All that power in a laptop? Never…

  6. Everything Else…

    1. Apple I, ][, /// & Lisa

      Not really 68k Macs, but certainly Vintage!

    2. Newton

      The best PDA ever finally gets its own forum!

    3. Software

      Includes system stuff, productivity, emulation, design, and games for pre-OS X Macs!

      • dcr
    4. Hacks & Development

      Yes, it's back! Hardware hacks/modifications and software development for Mac OS.

    5. Peripherals

      Anything you can hook up to your Mac or stuff into it as an interface!

  • Posts

    • Hi I use the case of my portable with new macbook but I want to keep the original keyboard, do anyone know how can I use the macintosh portable keyboard and change the IDE interface to USB so it works with new Laptops?  
    • I kind of thought it went without saying/repeating that if you actually want to feed *anything* from your SuperMac card into the compact monitor you'll need something like a Micron neck board (or requisite hacks to the original analog board) *and* the necessary hacks to the horizontal drive outputs.   If you have a sufficiently flexible multisync monitor lying around you can *prototype* the mode on that, but ultimately you're nowhere without doing some actual soldering.     Find the data sheet for a CRT similar to the one in a compact Mac and figure out what the drive voltage is for the intensity pin leading to the electron gun, and from there look for a high speed analog op-amp that can convert the 0-0.7v range that's standard for VGA-era analog monitor inputs into what the tube wants. Presumably that is what the Micron board has on it, unless said op-amp is on the card itself.
    • Yes, a SCSI2SD can be used to save your HDD. For an external connection you need an adapter (50pin to 25 pin) and a cable for SCSI2SD 5.0 (25 pin sub D; 1:1). The version 5.1. can be delivered with an extra installed 25pin connector. Then you only need the cable (25pin sub D (and perhaps a power adapter(?), but I think power can be delivered by the SCSI port of the SE directly; for a mac plus you need an external power adapter)). 5.0: https://www.itead.cc/scsi2sd.html Adapter; https://www.itead.cc/scsi2-50pin-to-scsi1-db25-adapter.html External enclosure: https://www.thingiverse.com/thing:1131419 I have 4 SCSI2SD 5.0 and I am very happy with them. You can change the SD card and boot different systems or you install up to 4 SCSI Drives on one SD-card. 2GB of memory is a lot for classic macs.   5.1: https://store.inertialcomputing.com/SCSI2SD-V5-1-p/scsi2sd-v5.1.htm   You can also use an external SCSI ZIP or a JAZ Drive. But they are often expensive and sometime are delivered defect. I would not use 1.44 MB disk to save my HDD.    
    • Ah! But I might as well buy a 24mhz crystal just for the fun of it  .  .  .  unless you've got a better suggestion? You haven't said if it might be fed to the GS neck board thru the A/B gatekeeper?   Good question? I don't think I've ever tried to lower the resolution, why would I as a dyed in the wool pixel junkie? In a quick check, neither resolution switching nor QuickDraw acceleration are mentioned in the manual, so I'd say not offhand. It was designed to drive SuperMac 16" and 19" 1024x768 displays which were almost certainly fixed at the 64mhz standard clock frequency. The card was bundled with a 30.24mhz crystal to drive two of Apple's fixed frequency displays. The card dates from 1989 and was geared toward panning around virtual desktop resolutions up to 4096x1536! Slap a 24mhz crystal on it to support MultiSync monitors at 640x480 or a 14.31818mhz crystal for NTSC RGB at 640x480. That last sounds very good indeed now that I've found it in the docs, I was afraid it might not support a low enough clock to output the Compact Mac's 512x342.   Dunno, the card always sounded pretty awesome to me given that I was mired in B&W, albeit in the 1182xwhatever range at that time. Pathetic is in the eye of the beholder. In 1989 I think this was something to behold. By the second rev of the Spectrum/24 series, not so much. The market had moved beyond big virtual desktops to multiple big displays for CAD and DTP had begun to require QuickDraw acceleration. It'll do for this.    ______________________________________________________________________________________________________   I'm getting waaaay ahead of myself here, but is there currently a RAMDAC type part available that's suitable to a GS/30™ card design? In the HDMI output NuBus VidCard thread, the VRAM side of things sounded practical enough, but the back end was a formulaic/done deal kinda thing for digital output from an FPGA. How would the analog side break down in terms of available, off the shelf components for pushing just a single, variable intensity analog feed to the GS neck board? Sounds like a strange beast?
    • Hey guys,   So I have this Mac II that I've had for eons, and it sat for about 8 years and the caps went bad.  I can see some light corrosion here and there, including the legs of UB1.  Anyway, it would not power on.  One of the PRAM batteries was dead, I replaced both with 3.6V (they were 3.0V, I've read mixed things in different forums as to what voltage is correct).  Still would not start.  So I replaced all the SMD caps.  It still does not start off the keyboard or back switch, but it does jump start and play the usual Mac chime.  However there is no video and it does not try to boot anything.   Would appreciate any suggestions on what to look at next.     I did the battery replacement a long time ago, and then shelved the unit.  For some reason I recall one of the batteries having its polarity reversed from the first one.  No idea why that would be, given the positive is clearly marked on the same side of each battery on the silkscreen.