Recent content by atax1a

no, it was us reading off the hardware dev notes and the PowerPC 603 manual. The 603 is being operated as a 64-bit data-bus chip, thus it fills its caches in 64-bit chunks, and so a fetch cycle on the CPU requires 2 data cycles of the 040 bus, and there's no real way around that. The CPU is...

Part of the problem with the 5200/6200 series is that the PPC is strapped to a bus converter that adapts it to the peripheral environment of a quadra; the chip is bottlenecked at the bus.

ah, mea culpa, we meant the web-compiled DingusPPC on Infinite Mac. We haven't tried Dingus as a standalone executable.

nb: running this requires a debugger to be attached, but MacsBug doesn't work in DingusPPC (pretty sure it doesn't work in SheepShaver either). It DOES work in Qemu, in both MacsBug and Jasik's Debugger. :)

Hey all, Prompted by the G3 ROM egg hunt, we revisited the MacKiDo page on easter eggs and saw the one about the PrintCopyright trap. Nobody seems to have written the requisite code, though, so here's a stuffit archive containing code that does it, and a screenshot of what it looks like —...

yes! Doug mentioned having found code that looks for RAM disks with a certain name, I went exploring in Infinite Mac, and found it. To get the easter egg to show up on a Beige G3, set up a RAM disk (any size will do). Select Special → Erase Disk, and name it secret ROM image - when it finishes...

Oh good luck! we're still going to try and dump the full firmware out of the device so we can see about writing code for it, though. :)

So, we do have a thought as far as getting a working copy of the Flash for you — since it reads the entire firmware at startup, we can probably tap the data bus with a logic analyzer, and turn that into an S-rec file. We wouldn't expect the 2080 firmware to work well on the other model, but do...

Reached out to Teledyne LeCroy on their support page, and an extremely helpful guy called us back; unfortunately, he looked, and they haven't kept archives for legacy gear, and so we're kinda on our own here. Alas.

PFA, in no particular order, visuals of the ribbon cables. Some of them _do_ have "Pin 1" markings on the silkscreen, fwiw.

Hi there, here is a dump of the boot ROM. There are two more EEPROMs that look like Atmel 17c128s for the FPGAs, and judging by the lack of SCSI strings in the boot rom, I'm going to guess that the bulk of the firmware is in a soldered-on Flash chip. I'm not sure how to dump those off hand. Also...

sure thing, probably can get around to that later this week :) luckily, you caught us with some time off and we've got a brand new handheld USB-C-powered screwdriver that we've been itching to try out; this gives us the perfect opportunity. fwiw, the file you attached only has ~24k of what...

Also you'll want a flat-top battery — being used to AAs, we bought an unprotected button-top and found it to be a little too big to fit without stressing the battery holder.

Unfortunately, we were never able to track down an upgrade file. We could PROBABLY dump the ROMs, but then getting them back onto another unit either requires you to also have the ability to write them, or us to reverse-engineer the upgrade format. :/

thanks! they're uploaded and being processed right now :)