JAG, it should work - there should be no need to remove the 1 Mb PROMs. I used Collin's cool
SeriTek1S2 firmware installer 5.3.1 (or
here or
here) and his cool
Sil3112-1S2 patched compressed PROM firmware to reprogram AliExpress Sil3112 and thus probably the same cards sans removal of their original 1 Mb PROMs, though in my case in my Power Macintosh 9500/120 with a G3 445 MHz processor card running OS 9.1. The process was superbly easy and efficient.
But I don't recall which PCI slot I used to do so, and later discovered that the card's not universally functional in any slot under all slot card neighbor mixtures. I don't know which specific Macintosh or Mac OS you're using, nor could I discern whether a particular slot or community of cards is likely to cause a dysfunction anyway, so I suggest removing all nonessential cards temporarily. And if you still experience a dysfunction try slot experiments - presumably you'll discover which work and which don't, at least in a mostly unpopulated PCI environment.
And run some version of Mac OS 9 (maybe OS 8 is fine too but my instinct would be to run OS 9 until your glitch is resolved).
And don't move the PROM voltage selection shorting bar - for the original PROM leave it in its original R25 position.
Addendum: Nice catch JAG, and sorry I failed to notice the PROM difference between the cards you received and those I did, or am guilty of some other personal memory failure.
Collin knows better than I do and perceives no need to upgrade to 4 Mb. But personally I view the extra storage capacity as wise because it causes no harm and adds the option of using the uncompressed version of firmware. And it might possibly prove very useful if some cool new firmware which requires more that 1 Mb arises later. The opportunity to add capacity is free now, but would come at the expense of another round of component ordering and soldering tasks later if a glorious new firmware option arises. Just my personal view of course...
Other news everyone: Due to time pressures forcing me to defer exploration of FlashROM to later, I replaced all the PROMs in my seven AliExpress Sil3114 cards with externally reprogrammed 4 Mb AM29LV040B PROMs, moved the shorting bar to position R4, replaced all the electrolytic capacitors with tantalum capacitors, drilled two holes and cut a slot in each panel, and installed a short SATA cable with eSATA panel mount connector to provide an eSATA port in the panel as Robin-Fo
illustrated. No glitches arose, and I'm populating all my Mac OS 10 systems with them. It's sooooo nice having three ports of wicked fast and solidly reliable internal SATA and one port of external eSATA in all these systems, and I look forward eagerly to replacing all the original SCSI and PATA storage devices with solid state SATA storage devices.
I plan to continue work with FlashPROM as soon as I can and will provide updates here and in my
SATA section of my Nerd Cave notes whenever new information arises. Cheers!