On 8/7/12 12:20 PM, Nick Allen wrote: was the bw2 in the chassis? I thought the 100u needed the original Stanford SUN video board (bw1?)

Yes I can confirm it is a issue with the video input at the wrong resolution and frequency. The bwtwo card is 1600x1280 and my monitor is made for 1024 lines of resolution. Hence, I need to use a different video card (the bwone). Thanks everyone for the help! -------------------------- On Aug 7, 2012, at 12:20 PM, Nick Allen wrote: />/ />/ On 8/7/2012 10:57 AM, Nick Allen wrote: />>/ Hey everyone, I ma repairing a Sun 100U computer, and am having some issues I would love some help with. I am using a bwtwo video card with the Sun 100U CRT (its a 17" HD B&W phillips CRT). I am getting an image showing a successful boot, but I am getting a split double image (like split screen but the same image on both sides). Any ideas what is causing this, a frequency issue? Any jumpers/settings on the video card which may inadvertently cause this? Could it be a CRT issue? />/ / Horiz frequency issue. i was working for a place a while back that de-tuned sun monitors for macintoshes and for a specific fixed freq video card. for the life of me I don't remember how to reset the freq of the video card or if the bwtwo was capable of supporting different frequencies.

from a couple websites, first... http://sunstuff.org/Sun-Hardware-Ref/s2hr/part3 The standard monochrome framebuffer, found in everything from the first Sun-2 to desktop SPARCs, and the 386i as well. Standard resolution is 1152 x 900 and high resolution is 1280 x 1024; other resolutions (1024 x 1024?) may exist. The very first implementations were TTL-only output levels, or switchable between TTL-only and TTL/ECL; everything since has been TTL/ECL. second. http://mail-index.netbsd.org/port-sun3/1996/05/14/0000.html The line frequency (horizontal scan) rate for the high-res is 89.3Khz while that of the normal monitor is 61.8Khz. The field (vertical scan) rates are almost identical at 66Hz and 67Hz. I presume that the framebuffer is the following 501-1003 "Sun-2 Monochrome Video" Multibus (with keyboard/mouse) DEVICE: bwtwo RESOLUTION: 1152 x 900 POWER: 4A @ +5V if not, what is the sun part number on the board?

On 8/9/12 12:15 AM, Mouse wrote: A 100U doesn't use a BW2 card, which was designed by Sun Microsystems. It uses the earlier SUN workstation card designed at Stanford. The 100U was a 'brain transplant' for the original SUN-1 CPU card, replacing the CPU with a Sun-2 CPU and memory, but leaving the rest of the cards alone. http://bitsavers.org/pdf/sun/sun1/800-0345_Sun-1_System_Ref_Man_Jul82 page 51 the resolution is 1024 x 800

On Aug 9, 2012, at 8:36 AM, Al Kossow wrote: Yes, and the "brain transplant" is an otherwise normal Sun-2 CPU, with different boot ROMs to enable the bwone and parallel keyboard, rather than the bwtwo and serial keyboard that would be used for an actual Sun-2. I.e., you couldn't do the upgrade yourself today by taking a processor card out of a Sun-2 and plugging it into your Sun 100. You'd have to replace the ROMs, too. A Sun-2 processor with Sun-2 ROM code and a bwtwo gets you a Sun-2. A Sun-2 processor with 100U ROM code and a bwone gets you a 100U. Simply replacing one framebuffer with the other gets you no console video, though presumably it would still work as a bitmap display for SunTools once UNIX loads, since the driver code is present in the OS for both framebuffers. The parallel keyboard interface is still present in the (multibus) Sun-2 but there are no code paths in the ROM to activate it. The bwtwo apparently has a configuration register to select a 1024x1024 framebuffer size, but I haven't found any information on how (or whether) this is expressed in any of the jumpers on the card itself (or how to enable it in software at the ROM monitor level) or whether this would even change the display timing (I suspect it would have to). Presumably this is so folks upgrading a 150U chassis to Sun 2/170 equivalent could continue using their old monitors... but this is just a guess. Technically I suppose you could do the same in the 100U but mechanically it's a lot more challenging due to the way the I/O connectors are expressed on the back panel of that chassis. ok bear.