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Re: Serial mouse woes

You need to measure voltages. Here is similar 8 page saga and it turned out -12V wasnt reliably going to the card https://www.vogons.org/viewtopic.php?p=1174713#p1174713 On your Astral UMC UM8663 has build in voltage level translators for RS232. Those can go bad. Loopback test might work OK with bad …

Re: 486SLC chips

And for the earlier questions regarding the use of SoundBlaster DMA and BARB - yes, it causes flushes and performance degradation. But it's not terrible... The SB (or floppy) DMA is not the worst offender when it comes to BARB setting, the non-hidden memory refresh is. feipoa just tested sound …

Re: 486SLC chips

This video made me investigate Cyrix support subject :) The PCChips M396F ver. 2.x and 3.0 motherboards do support both the Am386SX/SXL and the Cx/TI486S(X)LC CPUs. The missing pin ... FLUSH (pin 30) connections to the chipset. Half assed BIOS support, BARB fallback mode only leaving performance on …

Re: Serial mouse woes

are you sure serial ports work on VLB card in the first place? Connect pins 2 and 3 together, open terminal program and type something to see if data is coming back, or even without linking plug and move mouse - there should be some garbage in serial terminal. Finally test if voltage generated by …

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