68kMLA Classic Interface
This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.
| Click here to select a new forum. | | Colour Classic, 575 board & PowerPC | Posted by: AlpineRaven on 2018-10-03 23:52:30
G'day all,
Ive recently obtained an PowerPC LC PDS card (Daystar 601 LC PDS card) that replaces 68040 cpu socket to PowerPC.
Since I have 575 board in my Colour Classic, so I thought I'd give PowerPC a go.
Updated to 7.5 as per instructions from this site; http://colourclassicfaq.com/mobo/mystic.shtml
in 68040 its working well, I have 20mb RAM installed.
As soon I turn on PowerPC and restart - it won't boot up and the screen is all black, it does have a chime.
Which leads me to think its because the screen is 512x384 not 640x480.
DO you know if there is a work around to get PowerPC to work?
Cheers
AP
FYI: its working in actual LC575 and LC475 as I tested it in both.
| Posted by: beachycove on 2018-10-04 19:57:40
As I recall, the ResEdit hack relies on fooling the machine into thinking it isn’t a Color Classic, but another machine (a 580 or some such).
If you are relying on that hack, the ppc card might be asking the machine to believe too much, as ‘twere.
| Posted by: Franklinstein on 2018-10-11 19:57:00
So your upgrade goes in the LC PDS? I didn't know they had one in that form that upgraded to PPC. I know there was an official Apple upgrade for at least the LC 475 that actually physically displaced the original '040 during installation, then reinstalled the '040 into a special socket on the card.
AFAIK, the 575 board won't work properly in a CC without either a resolution mod or a ResEdit hack, as mentioned above, so a first guess would probably be that your problem is related to the resolution.
Do you hear the hard drive operating? Did you try booting from a floppy and listen to whether it tries to run or not? It's also possible that the PPC upgrade is drawing too much power which prevents the system from booting properly. These machines are usually said to have weak power supplies from stock, which is one of the reasons for changing the analog board out at the same time as a huge upgrade.
| | 1 |
|