Given the content mentions Adobe, perhaps it is from a printer like the LW 8500 or 810?Oh that’s strange! I wonder which Mac would have had an 8 MB ROM during development. Maybe there is a ROM disk appended to it or something…
Ha! Nice sleuthing! That makes perfect sense with the Adobe strings and everything.The LW8500 has 8MB ROM in two 4MB SIMMs like this one is suspected to be.
Grew up in an environment where there were LW 810s and 8500s about lots of people forget they existHa! Nice sleuthing! That makes perfect sense with the Adobe strings and everything.
I suspect they were using an 8100's cache slotYep! That looks like pretty darn good evidence. I'm kind of shocked they did it this way instead of a single ROM DIMM. Maybe it was in order to fit 8 MB based on common flash sizes available at the time.
I wonder if the LaserWriter 8500 is capable of reflashing its own ROM SIMMs in system
Guessing the CPU is related to the one on Apple's 8•24 GC video card (@GRudolf94) ?Looking at those pictures in more depth, it looks like there were even provisions for two more ROM SIMM sockets for a total of 16 MB of ROM.
I find it kind of funny that the processor is an Am29040 and the flash memory for the ROM is Am29F040B. Super close part numbers. At first I was wondering if everyone involved in writing the documentation was super confused and thought the flash memory was the main CPU or something but clearly the Am29040 is an actual CPU model by AMD. Although it seems to be 32-bit...so I'm guessing the high and low ROM SIMM banks don't actually combine to create a 64-bit data bus like I originally theorized; they probably are just activated at different times based on one of the address lines.
Hey @switch998 do you have a photo of the topside of your 40MHz Q800? I'd be interested what speed clock is fitted at location "G3" (next to the inner Nubus slot) and if Jumper "J29" is fitted alongside the CPU.View attachment 57473
I found one in my EVT Quadra 800. I would guess both are from a Q800, since the date codes on the other ROM look the same. But maybe someone else can chime in if this style of simm was re-used in other macs.