How about a select/deselect for bitbanging a knot of TTL chips (ram upgrade over 4mb) ?? Or a hardware reset switch which did not destroy the contents of ram? An add-on hardware controller that you patch-in AFTER the self-test code has executed. Or a rom in place of some other rom that would fail self-test thus the 'bypass switch'. A toggle to boot from another physical hard disk drive which is no longer with the system since both positions don't work. A toggle whether to boot from disk or by x.25 over the serial port to an Amdahl mainframe? Better yet, a Fujitsu. ;-) Maybe if you hold down the keys: RSHIFT+Leftshift+CTRL-YPBQZXHRT+SPACE while switch in back whilst holding these keys. I've tried, it is possible. You will have to put the system unit on the floor so you can operate the power and toggle switches with your big toe or use your nose. I'd try flipping the switch several hundred times while the machine is powered to see what happens. Maybe on the 384th cycle, a counter enables a rom that displays the 'computer kill' program that was so popular on in the mid-eighties. This program simulated your computer freaking out and dying. The demo may be set to only continue executing while the switch is being rapidly toggled. The ends of the wires connected to the switch are twisted together and taped to the side of the case with a note saying "gotcha". One wire only is attached to Rom disable pin. The ends of the wires connected to the switch are twisted together an taped to the side of the case with a note saying "Send a postal money order to the address on reverse and we will tell you what this switch does". Same wire. One way to expose this kind of scam is to unscrew the retaining collar on the switch and pull very hard on the switch body. If the note comes out with the wires, you saved yourself a lot of speculation and can feel pride in not being 'taken-in'. Barring these and the several thousand other possibilities, opening the machine would be useful.... Just Funnin'. Regards, Jeff -- ----------------------------------------------------------- Jeffrey S. Worley President Complete Computer Services, Inc. 30 Greenwood Rd. Asheville, NC 28803 828-277-5959 Visit our website at HTTP://www.Real-Techs.com THETechnoid(a)home.com -----------------------------------------------------------

Well, I have to admit, these answers have been pretty funny. I kinda like the idea of ripping the switch out, to see if a note is attached. But seriously, this could very well be a device sold for the Lisa called the "ROM Switcher". Because Lisas used a number and shape of pixels in the video display different the screeen to the Mac standard. This involves new ROMs. However, with this kit installed, a Lisa can't run Lisa software (a Lisa without the kit CAN run Mac software, the video is just somewhat distorted). The ROM Switcher uses both sets of ROMs, and allows you to toggle the video mode back and forth. It should not, however, generate errors. Possibly, this is a homebrew version of the ROM Switcher, since the real one doesn't use wires hooked to the video card. Louis On Sat, 4 Nov 2000 13:19:01 -0800 (PST), Fred Cisin (XenoSoft) wrote: