The problem of the Macintosh IIsi is that the built-in graphics card was meant to work with proprietary Apple displays (12 to 14"). Each of those monitors had a fixed resolution. For example, a 12" monitor was fixed at 640 x 480, a 14" monitor at 864 x 642. The monitor uses 'sensing pins' to tell the Macintosh what resolution it can handle. Since they're fixed, your stuck with just one resolution.
I have had the same experience with a IIci, which worked fine with the monitor belonging to my LCIII, but didn't work with the 14" that came with my Power Macintosh 8500. It chimed and booted, but never displayed any image. I suspect that the monitor that does work on the IIsi is just a 'lucky hit'. And the above mentioned is the reason why you can't switch resolution: the IIsi mistakes it for a 12" display. The best way around it is to try and find out if you can use the DIP- switches on the adapter to fool the IIsi into thinking it's dealing with a straight forward 640x480 monitor. Mine is capable of that, although it might not work for yours. Another way around it is to find a NuBus video card (SuperMac/Radius). These usually accept a wide variety of monitors and produce an image of extraordinary quality on LCD! Greetings, Eelco. On 13 sep, 20:24, Jonathan Sip <jon...@gmail.com> wrote: > I'm having the same problem with a PowerMac 6100 / Mac PnP 8 DIP adapter / > NEC MultiSync LCD1550V. > > On Sep 13, 2011, at 8:36 AM, GuyWithGuitars <countjim...@gmail.com> wrote: > > > > > So, I have a IIsi. I also have a 'Unimac Fly' DA15 to VGA adapter, > > with 8 DIP switches. The adapter works fine with my Performa 6360 but > > I can't get a signal to my Viewsonic VE5106 LCD monitor from the IIsi > > using this adapter. > > > On the bottom of the adapter, it says (verbatim) "for sync on green, > > switch #5+8 OFF" > > > I found one monitor that works without a hitch. I plug in the > > standard, non-switched DA15 to VGA adapter and voila, it works. > > Trouble is, said monitor is not mine and it never will be. > > > I'm running System 7.0.1. In the monitor control panel, there is no > > option to change resolution (when I'm using the monitor that works > > with it) > > > No matter the settings, I can't get a signal to this monitor. I know > > the Viewsonic monitor works, as I have it connected to the Performa. > > > Any suggestions of help would be greatly appreciated. > > > -- > > ----- > > You received this message because you are a member of the Vintage Macs > > group. > > The list FAQ is athttp://lowendmac.com/lists/vintagemacs.shtmland our > > netiquette guide is athttp://www.lowendmac.com/lists/netiquette.shtml > > To post to this group, send email to vintage-macs@googlegroups.com > > To leave this group, send email to vintage-macs+unsubscr...@googlegroups.com > > For more options, visit this group > > athttp://groups.google.com/group/vintage-macs > > > Support for older Macs:http://lowendmac.com/services/ -- ----- 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 vintage-macs@googlegroups.com To leave this group, send email to vintage-macs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
