zark@csd4.csd.uwm.edu (Steven M Kosloske) (06/18/91)
A company called MacSource lists a $199 16MHx accelerator for the Plus, SE and Classic. I called them to ask about this item, and the tech on the other end told me that they should be available in a month or so, since they're still ironing out some bugs on it. Supposedly, this is a direct replacement for the 8MHz CPU. Has anyone heard anything about this product? -- (Steve Kosloske) | "Speed Racer was disqualified from ------------------------------------| the race because he did not have a Internet: zark@csd4.csd.uwm.edu | pineapple in his car." - Speed UUCP: uunet!zark@csd4.csd.uwm.edu | Racer , The Desperate Racer
pophal@nicmad.UUCP (Gerry Pophal) (06/21/91)
In article <13186@uwm.edu> zark@csd4.csd.uwm.edu (Steven M Kosloske) writes: > >A company called MacSource lists a $199 16MHx accelerator for the >Plus, SE and Classic. I called them to ask about this item, and the >tech on the other end told me that they should be available in a month >or so, since they're still ironing out some bugs on it. Supposedly, this >is a direct replacement for the 8MHz CPU. Has anyone heard anything >about this product? > >-- > (Steve Kosloske) | "Speed Racer was disqualified from >------------------------------------| the race because he did not have a > Internet: zark@csd4.csd.uwm.edu | pineapple in his car." - Speed > UUCP: uunet!zark@csd4.csd.uwm.edu | Racer , The Desperate Racer Although I don't know of this product here is instructions to make your own from an article in Info-Mac Digest V7 #230; Date: 30 DEC 89 19:19 CET >From: UG142BC%DM0LRZ01.BITNET@cunyvm.cuny.edu Subject: 16 MHz 68000 in Mac Plus/SE, again In V7 Issue 225 I wrote: >Hi, recently an article appeared in a german computer >magazine, which suggested an exchange of the 8Mhz 68000 >processor against an 16Mhz 68000. They reported no timing >problems. Thanks to all who replied. Most of them pointed out that a 16 MHz 68000 running at 8 MHz is in no way faster than a 8 MHz 68000. Sorry for wasting your time, as I see now I should have been more precise: What I want is a 16 MHz CPU running at 16 MHz. Here are the instructions from the cited article (c't 1/90): -------- start of instructions -------- Cut Pins 11, 12, 13, 20 of the old (8 MHz) CPU. Connect Pins 11, 12 and 13 of the old CPU to ground. Solder the new (16 MHz) CPU *upon* the old CPU (it's not necessary to remove the old CPU), except Pins 11, 12, 13 and 20, which are directly connected to the motherboard, and except Pin 15, which receives the clock rate (16 MHz) from Pin 19 GLU (Mac SE) or Pin 8 of the quartz oszillator (Mac Plus) via 3 inverters 74LS04. You will have to experiment with the exact number of inverters needed. -------- end of instructions -------- As you might see from the above translation, I am really no expert in this area (what the hell is an inverter?). But the whole procedure seems to be simple enough, so I would like to ask again: Has anybody tried this? Are there any experiences or comments? Hardware gurus: What do you think, will it work? Will it be as fast as a Portable? If not, why not?.... Once again, if you reply to me, I will summarize to the net. Thanks in advance. -- Markus. Bitnet: ug142bc@DM0LRZ01 Markus Fest Fachbereich Mathematik Ludwig-Maximilians-Universitaet Muenchen ------------------------------ -- UUCP:harvard-\ att--\ | Sysop Mad Mac BBS(608)221-3841 ucbvax!uwvax!astroatc!nicmad!pophal | Gerry Pophal(608)271-3333ext2091 rutgers--/ rolls--/ | Nicolet Instrument Corp. ames--/ decvax-/ | Madison, Wis 53711-0451