Just worked on mine today. One half looked like it leaked and there was not enough coolant. Although even using gravity, I couldn't manage to get any liquid to flow through the pump. (it was running). I was able however to blow air through all the system and that went fine.
At this point i'm...
I have this on all My PowerBook 180s. From what I've been told The PRAM battery is dead which is shorting some part of the RTC.
All of this is located on the Jedi board. (The board interconnecting the screen and the logic board). Il theory, replacing the battery fixes this but I've never tried...
Looks nice ! NXP is still pumping out MPC8313s from factory, so take your time and have fun with this one.
If performance is an issue, you have plenty of faster MPCs to choose from anyway. Keep us updated
Very interesting. Small question here: what is the interrupt or even DMA on a simple memory mapped RAMDisk used for with MacOS ?
All the implementations I know (on 512k/Plus type hardware) were just memory mapped
The video system on your PowerBook 520 is spaced to drive a VGA screen at 640x480 or 800x600 (8 bits only tho)
However you need two daisy-chained adapters to achieve that:
- PowerBook Display Adapter (part number 590-0831-A). That will gives you a Standard Mac DB15.
- Mac DB15 to VGA...
Totally correct. The 68030 bus was used by devices who didn't need better (well maybe Ethernet could use better, but MacOS wasn't able to handle faster rates on that CPU anyway).
I've three of them (5200/6200/5320), while running them with the stock 7.5.1 is a fine field, 7.5.5 is a little...
Rev 1 also here :
00:10.0 Unassigned class [ff00]: Apple Inc. Heathrow Mac I/O (rev 01)
Flags: bus master, medium devsel, latency 32, IRQ 21
Memory at f3000000 (32-bit, non-prefetchable) [size=512K]
Kernel driver in use: macio
Well that was an idea at some point, but there was (female) DB-19 availability issues (and IRL issues)
Yeah Tash20 needs to be first, otherwise that will not work. It's not a real passthrough, the PIC in Tash20 will select the floppy drive as well.
I will try a design in a few months if free...
This is a relatively know issue.
Rev-A have a "faulty" IDE controller, which doesn't support all of the IDE specs. For example, a REV-A logic board doesn't support slave devices.
Rev-B fixed most of that, that needed a new ROM as well.