The 450 (an LC III) has the standard two-row 15pin port. I'm assuming the Sony 15" has the standard 3-row VGA 15-pin port. Assuming the Performa and the Monitor are working, it comes down to your cable. Please describe the cable you have. Does it have an adapter that goes from 3-row to 2-row 15pins? Does that adapter have dip switches or a rotary dial?
You see, it's not just about the pins matching. The cables themselves tell the mac what kind of monitor is attached. If you have an adapter or straight cable that doesn't have any settings then it is set to a single mode. My guess would be that it is set to 1024x768. The Performa supports 512x384 (12" monitor), 640x480 (13" monitor) and 832x624 (15" monitor) modes. It came with 512k of VRAM which gives you 16 colors except for the 832x768 mode; take the gram up to 768k and it would support 16 colors in all modes. Regardless, the Performa doesn't support 1024x768 so your cable needs to geared to tell the LC that it's either a 13" or 15" monitor. The follow eBay auction has one of the adapters with DIPs that allows you to select/configure the cable settings. http://www.ebay.com/sch/i.html?_from=R40&_trksid=p4840.m570.l1313.TR0.TRC0.H0.Xmac+monitor+cable.TRS0&_nkw=mac+monitor+cable&_sacat=0 CR On Tuesday, April 7, 2015 at 7:56:08 AM UTC-5, Scott Brant wrote: > > I've got a Performa 450 I just bought off eBay. It had a functioning > photo with a 13" vintage Mac monitor > I've bought the appropriate cables to physically plug it into my 15-20 > year old Sony 15" monitor. I can't get it to work. > > Any ideas? > > > -- -- ----- 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/ --- You received this message because you are subscribed to the Google Groups "Vintage Macs" group. To unsubscribe from this group and stop receiving emails from it, send an email to vintage-macs+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
