18-01-2022, 05:07 PM
CF's on Microbee hardware are a problem of their own. A CF card that works fine in one hardware system won't in another. Even just changing the Mainboard and keeping a Coreboard CF card combination will sometime work and other times not. Some brands of CF cards are more prone than others. My rule of thumb has been the slower and older types of cards work better than newer more modern cards.
I also use the GOTEK method for transferring files, as it is robust and straight forward but limited in capacity. I have not spent a lot of time working on uBee512 / real hardware interchange via CF card, as most of the time I can fit what I need to transfer on a single or two GOTEK floppy images.
ROM D (from my notes) would be the NET ROM (IC 20) this is able to have 32Kb or 64Kb/128Kb ROM's fitted, so power to PIN 26 of this socket is required to allow the 32Kb ROM to be powered (PIN 24 of this ROM). To run a xx64 would work fine without MOD but the Circuit shows the possibility of using a 27128. Once again the lower half of the 27128 can't be accessed without changing the link going to PIN 26 of this socket, which by default is connected to +5V. Changing the link enables the switching between the lower & upper banks.
I don't know why they didn't do the same for ROM C (IC15)?
Ernest
I also use the GOTEK method for transferring files, as it is robust and straight forward but limited in capacity. I have not spent a lot of time working on uBee512 / real hardware interchange via CF card, as most of the time I can fit what I need to transfer on a single or two GOTEK floppy images.
ROM D (from my notes) would be the NET ROM (IC 20) this is able to have 32Kb or 64Kb/128Kb ROM's fitted, so power to PIN 26 of this socket is required to allow the 32Kb ROM to be powered (PIN 24 of this ROM). To run a xx64 would work fine without MOD but the Circuit shows the possibility of using a 27128. Once again the lower half of the 27128 can't be accessed without changing the link going to PIN 26 of this socket, which by default is connected to +5V. Changing the link enables the switching between the lower & upper banks.
I don't know why they didn't do the same for ROM C (IC15)?
Ernest