I was getting the over range on the monitor. So this monitor is multisync? So it supports sync on green?Sounds like a plan. Checked the IIsi DevNote:
On-board video
In addition to the existing NuBus video options, a new video
solution has been built into the Macintosh IIsi computer, supporting
the Macintosh II 12-inch B&W, 12-inch and
13-inch RGB monitors and the 15-inch B&W portrait monitor. The
12-inch and 13-inch monitors are supported at up to 8 bits per pixel
(256 colors or shades of gray) and the
15-inch portrait monitor is supported at up to 4 bits per pixel (16
grays).
The video signals are generated by the Apple custom RAM-Based
Video (RBV) chip and are driven through a combination color
lookup table (CLUT) and video digital to analog converter (VDAC)
chip. Each monitor identifies itself by grounding certain pins on the
RBV causing it to automatically select the appropriate pixel clock and
sync timing parameters. See “Video Cables” later in this chapter for
cable wiring details.
When an unknown monitor (or no monitor) is plugged in, on-board
video is halted. As shown in Table 4-1, the monitor.ID bits can
specify eight possible combinations, each of which may indicate a
particular monitor.
You weren't getting the "Over Range" indication on p.10 of the manual? Shouldn't be, sounds like a very capable multisync. If you're getting no signal, the adapter/setting is the problem. Sense lines for one of those supported resolutions need to be detected at startup or the IIsi won't buffer the first MB of RAM for using part of it as the video buffer. Other than 4bit Portrait, the IIsi is sorely lacking in the video output department.
Well i tried that putting my performas 7.5.5 hd in the iisi and it turned on but the hard drive just hangs. Its been recapped but theres no sound so theres no way to know whats going on.Sounds like a plan. Checked the IIsi DevNote:
On-board video
In addition to the existing NuBus video options, a new video
solution has been built into the Macintosh IIsi computer, supporting
the Macintosh II 12-inch B&W, 12-inch and
13-inch RGB monitors and the 15-inch B&W portrait monitor. The
12-inch and 13-inch monitors are supported at up to 8 bits per pixel
(256 colors or shades of gray) and the
15-inch portrait monitor is supported at up to 4 bits per pixel (16
grays).
The video signals are generated by the Apple custom RAM-Based
Video (RBV) chip and are driven through a combination color
lookup table (CLUT) and video digital to analog converter (VDAC)
chip. Each monitor identifies itself by grounding certain pins on the
RBV causing it to automatically select the appropriate pixel clock and
sync timing parameters. See “Video Cables” later in this chapter for
cable wiring details.
When an unknown monitor (or no monitor) is plugged in, on-board
video is halted. As shown in Table 4-1, the monitor.ID bits can
specify eight possible combinations, each of which may indicate a
particular monitor.
You weren't getting the "Over Range" indication on p.10 of the manual? Shouldn't be, sounds like a very capable multisync. If you're getting no signal, the adapter/setting is the problem. Sense lines for one of those supported resolutions need to be detected at startup or the IIsi won't buffer the first MB of RAM for using part of it as the video buffer. Other than 4bit Portrait, the IIsi is sorely lacking in the video output department.
Its been cleaned almost 10 times since i had it and whoever had it before really cleaned the board and recapped it. Same thing if i remove all the ram. If it has 1mb on the logic board why wont it boot? The rom chips are on the board to. Theres no sound at all the speaker just pops when turning it on. External speakers wont work either.Are you sure they're different values and not just different configurations? I.e. number of chips per SIMM?
In the event they're actually different values, that would definitely pose a problem. Here's the IIsi' page from the memory guide:
You do need to install all identical (value) SIMMs. You could try to pull the RAM and see what happens. It might not boot into the os all the way, but you could see if that solves the video issue. If it clears up, your ram is probably the culprit.
Edit: i should also ask, has the board been recapped? Does it still chime?
Well it might boot system 6.0.7 all the way to the finder, but it uses part-to-all of that 1 MB for video. Another thing to try for no sound is check the contacts on the board for the speaker, they were notoriously terrible for the original LC as well, so they switched to a pin header for the LC II. You can usually clean them with a mechanical pencil eraser or some cotton swabs and alcohol.If it has 1mb on the logic board why wont it boot