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Hello, Guest! Welcome back, and be sure to check out this post for more info about the recent service interruption and migration.
ymk's latest activity
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Yymk replied to the thread Missing SE/30 SCSI Controller Chip.Right. SCSI 1/2 are collections of standards and no device implements all of them. Trying to improve the I/O performance of a 16MHz...
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Yymk replied to the thread Annoying coil whine coming from Powerbook 100.I'd still go with a conformal coating or lacquer over hot glue. It will penetrate better, trap less heat and won't soften when warm...
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Yymk replied to the thread Annoying coil whine coming from Powerbook 100.If you can identify the whining coil, conformal coating may silence it.
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Yymk replied to the thread Quadra/Centris 650 -- boot from external SCSI.Remove the thing that's different.
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Yymk replied to the thread has anyone seen this before?.Make sure the heat pipe hasn't failed.
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Yymk replied to the thread New puzzle game for 68k macs.Neat game. What did you write it in?
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Yymk replied to the thread Which size Hard Disk Jumper Caps do I need?.Sounds like they might be 1.27mm or 0.05" pitch.
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Yymk replied to the thread New puzzle game for 68k macs.Very nice! I've been using THINK C 5 on a Centris 610. The 1152x870 display is easy to work with and compile times are reasonable. I...
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Yymk replied to the thread Macintosh Classic stalls booting when anything is plugged into the SCSI bus.I think a Classic PCB is in development. I don't blame you for setting it aside. I've got several logic board puzzles in storage...
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Yymk replied to the thread Macintosh Classic stalls booting when anything is plugged into the SCSI bus.Wild guess, one of the higher address lines? Eliminating the SCSI chip as a potential cause is still progress.
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Yymk replied to the thread Macintosh Classic stalls booting when anything is plugged into the SCSI bus.Maybe the data lines? I'd swap the chip at this point. Mouser has the Z53C8003VSG. I don't know if it's compatible.
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Yymk replied to the thread Macintosh Classic stalls booting when anything is plugged into the SCSI bus.I checked my board and SCSI controller pin 18 doesn't run to 68000 pin 8. It does run to pin 54 of the BBU. I mixed up the /LDS and...
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Yymk replied to the thread Macintosh Classic stalls booting when anything is plugged into the SCSI bus.Those are low, but I doubt they're causing a problem. Here are the lines on the SCSI controller that reach other ICs. The ones in cyan...
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Yymk replied to the thread Macintosh Classic stalls booting when anything is plugged into the SCSI bus.I'll check the schematics later. What do your +5V and +12V rails measure with that hard drive attached?
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Yymk replied to the thread Macintosh Classic stalls booting when anything is plugged into the SCSI bus.Those voltages look OK and show the bus is idle. Check the pins of the controller for electrolyte and corrosion. The nearby rail caps...
