Turbo 601 in SE/30 — #9

Post #9 by da9000

Source Forum	68kMLA
Category	Hardware
Post Date	Sun, 10 May 2009 - 06:48
Original URL	https://68kmla.org/bb/threads/turbo-601-in-se-30.15702/

Post

Very interesting discussion. Another thought for helping remove any doubts about power supply problems is to trace the Turbo 601 and find out where to supply power and get power directly from the PSU (or from an external PSU) right onto the Turbo 601. But... you better know what you're doing if you're gonna do that.

This link will be helpful for those that are trying to figure out PDS slot compatibility:

http://lowendmac.com/tech/pds.shtml

And the interesting part for this discussion is:

The next Mac with a PDS was the SE/30, a compact Mac that shared the SE's case but pumped to the beat of a 16 MHz 68030 CPU. Because the 68030 had more connections than the 68000, the 68030 PDS was born in January 1989 - and that's why SE and SE/30 cards are not interchangeable.

That September, Apple introduced the Macintosh IIci, a 25 MHz workhorse. The first use of the 68030 PDS in the IIci was for a 32K level 2 cache, which used fast static memory that the CPU could access much more quickly than memory on the system board. (Except for the size of the cache, little has changed since then.) The 68030 PDS in the IIci would later accept lighting fast 68030, 68040, and even PowerPC upgrades.

Apple got a lot of use out of the 68030 PDS. The one in the SE/30 ran at 16 MHz, the one in the IIci at 25 MHz, the one in the IIsi (Oct. 1990) at 20 MHz, and the one in the IIfx (March 1990) at a blistering 40 MHz. Except for bus speed, these were electrically identical, so it was often the case that the same card would work in the SE/30, IIsi, and IIci.

"Adapterology":

http://www.applefritter.com/node/20312

http://www.applefritter.com/node/10092

http://www.applefritter.com/taxonomy/term/122

And a very informative SE/30 "modding" discussion, including the stripes problem:

http://www.applefritter.com/node/20404

@MacSE/30:

Could you post some photos of these IIsi adapters? (or at least point out which is which in the above photos?)