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NJRoadfan

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  1. NJRoadfan

    68030 PDS: implimentation inconsistencies?

    -5V is rarely used by expansion cards. The host's power supply might not have it available either.
  2. NJRoadfan

    SE/30: Micron Xceed Video Card, DB-15 to VGA

    If the Xceed card only has pin 3 and is following the standard DA-15 video pinout, its only outputting composite sync any maybe sync-on-green. VGA monitors only support separate horizontal and vertical sync with a small subset also supporting composite or SoG. Many of the switched adapters have a built in sync separator to convert the composite sync or sync-on-green to separate H+V sync. You can build a relatively simple circuit using a LMH1980 chip too.
  3. The 5MP lacks any sort of expansion slot, its a "personal" desktop printer. HP's official print server solution was an external parallel port JetDirect box.
  4. PPD = Postscript Printer Description, its used by the driver to define things like resolution, paper trays available, etc. The 5MP only has parallel and localtalk, so a bridge is likely needed for hassle free Mac use. USB to parallel cables work fine with Windows (which uses a PCL driver), but not Macintosh. Classic MacOS only expects Postscript printers to be connected via an Appletalk network, hence why the LaserWriter8 driver only works via the LocalTalk port.
  5. All you really need is the PPD for the printer and they shouldn't be too hard to find. The LaserWriter 8 or AdobePS driver does the rest. EDIT: Drivers are still on HP's support site for OS 8 and 9.
  6. NJRoadfan

    Power Macintosh G3 Minitower Upgrades

    Beige G3s can take standard ATX power supplies (mine is running one right now). There is a jumper that you have to change on the motherboard in order for them to work.
  7. NJRoadfan

    ATX to Tanzania / 4400/7220 PSU adapter

    The reason for the lower rating on the +5v rail is that modern machines use +12v to power the VRMs on the board for the CPU. Older machines directly fed everything with +5v. Honestly all that machine needs is a cheap ATX to AT adapter and some wiring of the 3-pin power switch harness. The only "work" would be wiring the +3.3V harness.
  8. NJRoadfan

    SCSI2SD reverting to default device config

    Real internal SCSI devices terminated in that manner. If you are using an external case without a termination switch, you were expected to plug a terminator into the open daisy chain SCSI connector in the back. There were some devices that attempted to detect that they were at the end of the chain and auto enable termination, but it was unreliable and caused headaches.
  9. Old ATX is the same as New ATX, just the latter lacks a -5V rail (irrelevant for Mac use) and has more power available on the 12V rails since newer machines rely on 12V powered VRMs for CPUs.
  10. Its doubtful an Ethernet card needs -12V. Even if it does, its easy enough to pull off the power supply.
  11. NJRoadfan

    ATX to Tanzania / 4400/7220 PSU adapter

    If the power supply has a real power switch, turn it on and see if the fan runs. Put the negative lead from your meter into a ground pin (almost always black) and use the positive lead to probe the various pins for voltage. Standard colors for various voltages on PCs is below -Yellow +12V -Blue -12V -Red +5V -White -5V -Orange +3.3V
  12. NJRoadfan

    ATX to Tanzania / 4400/7220 PSU adapter

    If the old power supply works and just needs a fuse, than replace it and test the voltage present on the connectors. The wire color is generally standardized between Mac and PC, so don't expect any surprises. The aux connector exists because the original AT connector lacked 3.3v rails (late Baby-AT 486/Pentium boards generally used a VRM to supply 3.3v to parts that needed it). Its likely the Mac doesn't need -5V at all, I don't see it present in the power supplies of other PCI Powermacs.
  13. NJRoadfan

    ATX to Tanzania / 4400/7220 PSU adapter

    What the heck does the 4400 need -5V for? Early ATX power supplies had it (white wire, pin 18), but phased it out when the ISA bus vanished from PCs (very few ISA cards actually used it). You can likely safely omit the -5v line on a Mac. No need to "create" pins, you can y-split the 3.3v and 12v wires on your harness if you need extras. The +5VSB pin is always energized on ATX supplies, even when off as its the standby power pin.
  14. I know folks like to slam the 4400's case as being cheap and PC like, but the design and finish appears to be WORSE than actual PC cases. The only case I could directly compare it with is the horrible excuse of metal that Amiga 4000 desktop came in (also recycled from a case design from Commodore's PC division).
  15. NJRoadfan

    Diagnosing the 9600 From Hell(tm)

    I might still have a 300Mhz 604e card from a 8600 laying around here if needed. I also still have that boxed G4-450Mhz upgrade for sale (see OLD post in trading forum). Mac ATA cards definitely don't need drivers to boot, the driver is the onboard ROM.
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