On Monday, April 2, 2012 12:08:09 AM UTC-4, Scott Holder wrote:
The 68020 and 68030 aren't pin-compatible as far as I know, so if > someone's swapped them, it's not likely to work. > That was my impression as well. > From a quick look at some old MacWorlds and books the Googles turned up, I > found the following table: > > *Manufacturer/accelerator** Logic board** CPU speed* *List price (1991)* > > Dove Marathon 020 SE 16 699 > > Dove Marathon 030 Plus, SE, Mac II 16 699 > > Dove Marathon 030 SE, SE 30, Mac II, IIx 32 1599 > > So, there was a 68020 upgrade for SE, as well as an '030 upgrade > apparently. The one marked "030x" specifically seemed to be for the Mac > IIx, with a faster 68030. I wonder if they went the route some other > companies did (Daystar? Can't remember) and made one base accelerator with > various adapters for different Macs. > Which makes the presence of the 68020 even stranger. > At any rate, it's a vaguely puzzling situation. Some pictures or scans of > the board might be interesting to see. I wonder if at some point in its > life, someone harvested the '030 for something and stuck a spare '020 on it > to avoid losing it or something. > I thought the 68030 had a larger form-factor and more pins, but I cannot recall ever putting the two side-by-side, so that may be wrong. I'll take a picture of this board. It's hard to understand how an accelerator with no on-board cache would work. Besides the CPU, there's a single PLD and two 74LS glue parts - nothing else. It may simply have been a quick and dirty way to run a 68030 in an SE at the original speed? -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
