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Re: SC55 D1 diod replacement

Diodes are used for more than just AC to DC rectification. Looking at your PCB photos it appears this diode is being used as reverse voltage protection. This diode looks like it was meant to fail shorted in the event a power supply with the wrong polarity is connected. After looking at the datasheet …

Re: Could you expand the RAM in a 486 system using a VLB card? Possibly all the way to 4 GB?

I don't believe there is any likely user of 486es back in the day that had 1GB or more memory. I think that would come during the pentium era. And more than 4GB, with the pentium pro. (obviously) I agree. If anyone needed and could afford more that much RAM, they would have been buying something …

Re: Could you expand the RAM in a 486 system using a VLB card? Possibly all the way to 4 GB?

As far as I'm aware no one has attempted a VL bus memory expansion. In theory it should be possible, but there may be some roadblocks due to chipset and cache limitations. Since other hardware will take up memory address space, a complete 4Gb will not be obtainable. Most VLB motherboard supported at …

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