Why does Rev. C prohibit the use of APT?

If the device ID is set with a jumper, it's a soldering iron job (I changed the ID of my early-revision IDE Plus board this way). Later revision is much easier, since you just turn the device ID selection dial.

In any case, you'll see a row of 8 pairs of pads just behind the auxiliary power jack, probably with a jumper soldered to the leftmost pair of pads. Desolder the jumper and move it to the opposite end (or some place in between).

Again: excellent work - many thanks for this.

Nothing at all else to check, since it's worked on every other machine with VBXE in it. Of course a possibility for bugs exists, but I cannot imagine of what kind. Every other situation of this kind (in which old BIOS did what new BIOS cannot) eventually resolved itself in some hardware issue. What VBXE core are we using here? The BIOS attempts to map in the MEMAC_B window at $4000 to see if it replaces the Atari's base RAM. If RAM changes, we have a VBXE. If we can toggle presence of hardware registers by toggling VB pin, then we have a VBXE under control of the VB pin. It's that simple, so it's difficult to imagine why it would not work.

So - VBXE is enabled (therefore successfully detected), but cannot be switched off under software control. Same bits are toggled as before, so who knows.

Covox cannot be detected in software, so the option is always enabled. :)

Once again, the old BIOS didn't know or care whether the VB pin was connected to anything, or if VBXE was connected to the wrong pin. So there's a good chance that things which seem not to work with the new BIOS never worked in the first place. I already saw this with numerous U-Switch/Stereo installations. "My stereo cannot be toggled with the new BIOS, but it worked before". Turns out it never worked in the first place, but the original BIOS gave no indication of any problem since it didn't test the hardware.

Memory and System->SpartaDOS X->Enabled
PBI BIOS Setup->PBI BIOS->Enabled
PBI BIOS Setup->Hard Disk->Enabled
Advanced Settings->PBI BIOS Notice->Enabled

Save and Exit->Save changes and boot

If you see "Ultimate PBI v.x.xx" at the top of the screen, you have the most recent CPLD.

Please use versions posted in AA topic. I was asked to carefully document each fix in changelog, which I'm doing in recent versions. Website will be updated soon, but my second pair of hands is missing right now. ;)

Fixed.

It's possible to make a replacement using sheet aluminium, a laser printer, and a flat iron. I have done so before. If you can find no alternative, I can attempt to fabricate one when I find time.

Ultimate update, including new loader:

http://atariage.com/forums/topic/240034 … try3389841

Incognito versions to follow.

Thank you, but no: neither the Ultimate PBI BIOS nor SDX soft-driver for SIDE (nor any of the tools) require PBI.SYS. ;)