groo@chsdip (Bill Squier) (07/11/90)
I don't get comp.sys.amiga.hardware, and this is pretty general interest. Being the pround new owner of a 33MHz GVP 68030/68882 board, I decided to remove my old 68010 from the motherboard and replace it with the original 68000 (for compatibility reasons). According to the GVP documentation: [p.15] "...If you anticipate the need to switch between 68030 mode and 68000 mode frequently you may wish to mount a switch to the Amiga's rear panel and connect it to J11..." I've done just that. Now, my question: Is there any problem with throwing that switch while the machine is on (and perhaps, actually running)? Obviously, I expect it to crash the machine, but that's a moot point since I'm aiming to reboot at that point anyway. The way I see it, "power" is applied at all times to both the 68000 and the 68030, it's just a matter of redirecting the data. I had a friend who's done this for about a year with apparently no ill effects. ----- Bill Squier (groo) Amiga : uunet!tronsbox!dsoft!chsdip!groo (best) `Only Amiga!' VAX : uunet!vaxb.stevens-tech.edu!u93_wsquier
dfrancis@tronsbox.xei.com (Dennis Francis Heffernan) (07/11/90)
RE: 68000/030 switch on GVP boards I used to have such a switch attached, but it was a real UnGood wire- wrap job and it made me nervous, so I took it off. Throwing it with the power on didn't do anything. I notice, though, that the machine was more likely than not to guru on reboot if you did. Dennis Francis Heffernan | "Remember the words of your teacher, dfrancis@tronsbox | your master: Evil moves fast, but ...uunet!tronsbox!dfrancis | Good moves faster!" Original text (c) 1990 | --Partners in Kryme, T-U-R-T-L-E Power!