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I have the non-plus AE HD. It runs the rotation motor at half speed to do 1600K floppies (and the seek and read times are similarly slower). It can do 400/800K without a driver. The AE HD+ is a straight FDHD clone as far as I'm aware, or at least the Apple II version was.

Found the Apple chip. It's the floppy controller from the PC Transporter (PC/XT on a card) for the Apple II, also developed by The Engineering Department. AKA Dr. Wendall Sander and several other ex-Apple engineers who remained close with Apple. TED is suspected to have been involved with the...

Just to clarify: if you put the drive from the IIfx in another machine with the same exact disk it won't read in the IIfx, it then can read it?

That behavior from Apple power supplies typically means there's an overload or dead short to ground on one of the power rails on the motherboard. Check with an ohmmeter.

Thanks, that's useful. I don't suppose you have a binary of it compiled for 68K?

MAME emulates original Valkyrie for the Q630 and LC580, but its pure reverse engineering aside from what’s in the Marathon source.

The ROM code for those machines won't start up if the on-board RAM is bad. That's why you get the death chimes when you mark them bad.

It wasn't lock in in the conventional sense though. Anyone could call Motorola or a number of other companies and get 6845 CRTCs. After that every component of an MDA or CGA was available at Radio Shack except the font ROM. 100% compatible third party MDA and CGA cards and entire PC clones...

If anyone has any DuoDock DeclROMs I'd be interested in those. A little off the beaten path, but as far as I know they're still standard NuBus DeclROMs.

The difference is that PCs and Macs benefitted from a lot of third-party ASICs and FPGAs, but the platforms were not defined by those specific chips or compatible successors the way the Amiga was. And Apple/Dell/HP/Compaq weren't paying the full development costs for them the way Commodore was...

Commodore bet everything on custom hardware, which is the classic "how it started/how it's going" meme. Off-the-shelf hardware kept getting better and cheaper while custom chips kept getting more expensive. This is the same thing that killed arcade games and made game consoles go to standard...

Model-specific restore/install CD images seem to be a bit thin on the ground. I got the Q630/LC580 one from IA, and there's one for the first-gen Power Macs, but I know there are a lot of others that don't seem to be imaged yet.

Really cool!

For reference (from running the diagnostic disk in MAME).

You can diagnose bad solder joints by giving the monitor a mild thump. (Be very careful doing that with the case off though!) If the screen reacts at all from a mechanical shock, there are bad solder joints. Also, where's the purple glow coming from? A blue or purple glow from the CRT neck...

The /// doesn't have a video ROM. Text mode characters are fully programmable, like the C64 and some other machines.

On the pre-recall machines the problems weren't thermal per se, they were cheap tin contacts on the connector between the motherboard and the RAM array. (The recall changed them to higher-quality connectors, but that's a lot less sexy of a story than "Steve Jobs hated fans so the computer...

The best way would be to disassemble the driver enough to be rebuildable and replace the MAC address setting with loading it from a config file on the disk instead of the ROM. It wouldn't have to be a "showroom quality" disassembly, you could leave most of it machine-generated and just modify...

I've finally gotten the toolbox commands supported in MAME for file downloading. I did most testing with scuzEMU 0.5, but the closed source BlueSCSI "SD Transfer" program works too because I return their dumb magic ID string. Either way I can get things from the Garden into the emulation in...

It was fairly common to have drivers reject MAC addresses that didn't have the right manufacturer bytes. Even the ROM driver for the Quadras does it (it has 3 different Apple prefixes that it will allow).