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Re: Snark barker troubleshooting

You might have better luck with a logic probe that can detect short pulses, rather than an analog scope. Trace the write pulse as far as you can: 1. Pin 11 of U18 (the latch) 2. Pin 9 and pin 10 of U27 3. Pin 12 of U28 (should pulse when the write port is addressed. This is driven by U8 which should …

Re: MCGA monitor at 15 KHz?

FWIW, the MCGA chips have been decapped and imaged: https://siliconpr0n.org/map/ibm/72x8300/mz_mit20x/ - 72X8300 https://siliconpr0n.org/map/ibm/72x8205/mz_mit20x/ - 72X8205 (partial: top metal layers accidentally got removed) https://siliconpr0n.org/map/inmos/imsg171a/mz_mit20x/ - IMSG171A RAMDAC

Re: MCA Adlib card -- just need pictures

Hi there, is it true that these PS/2 models are "speed-sensitive" when it comes to add-on cards? I think I have read something about..."this card only works in model xyz, not in model abc" Currently I am awaiting my first PS/2 machine. It's an Model 56 486SLC2. It has no 5,25" drive, no scsi- …

Re: MCA Adlib card -- just need pictures

Make an MCA version of the fmonster sound card. https://www.vogons.org/viewtopic.php?f=62&t=61264 Though missing sound blaster dacs? Major oversight to me. There's also the blasterboard project: https://www.vogons.org/viewtopic.php?f=62&t=61098 I've already asked Eugene about an MCA Blasterboard, …

Re: MCA Adlib card -- just need pictures

Hi, still trying to source some Information, are there any known issues with CPLD Variant and XGA / SCSI Cards ? i will have PCBs soon and may be solder them in autum. It works fine in my Model 95 which has XGA and SCSI. But this is MCA, so YMMV. If it does end up working for you, let me know and I …

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