Hey jt,
It's been more than a decade. I think I documented that procedure at some point, so I'll try to look it up for you when I'm on my home machine. I might have posted it to the LEM Supermacs list at some point, if you are inclined to search and have the time. But I'm not sure that I did...
There is some number of resistors to move, two (IIRC) of which are under the DIP flash. That detail defeated some would-be converters back in the day, because they didn't look under the flash. Do you have a chip programmer? You really either need a chip programmer, or one working Mac version of the card.
Or the ability to hack the flash utility.
The flash utility checks the previous version of the software on the card. I can't remember if it checks for the PC version (and won't update) or the Mac version (and will update). The difference being that in the former case, a blank chip would work.
Anyway, I first got around the flash utility restriction by putting a socket on the target board. Then installing a flash chip that already has the Mac version on it. Then with the card installed in the machine (this part is a pain) run the installer. There's a couple of response screens. At the last one, the utility has checked the flash chip, so before clicking the final "OK", remove the flash chip from the socket of the card, IN THE LIVE MACHINE, and replace it with the blank/PC flash chip.
The utility will then flash the chip. Much easier to just program it in a chip programmer.
Note that I non-desctructively removed the 32 pin DIP flash, so that I could reuse it. This had the advantage at the time that the cards I modified were then updatable with new updates. Not an issue any more, as long as you load the last update to the card. Some of the folks who converted the Ultratek/66 would just clip the Flash off and replace it with a programmed 27 series EPROM. This was cheap and worked okay, but the card was not updateable afterwards.
