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The RAM addressing is interleaved for speed (IIRC), which is why you see the successive banding. Also, I will just say that you are a wildman! ^_^ It's awesome!

If you wiggled the card and the problem came back, then it could be a nubus data data line (which is card, not mac, since you tried multiple macs). Check the nubus lines and port carefully. It had an impact and could be damaged.

I am traveling at the moment, so responding quickly -- a few more things... - The ROM stores 68K code that is loaded/executed by the Mac CPU in the slot address space. So, when there is a write to board memory - like drawing to the screen during Primary INIT, it is going over Nubus. It's just...

Glad it's OK.

Sorry - my post above should have said SMT02 (not SMT01). Anyway - it looks like there might be something happening in the lower right corner of the SMT02 in your picture -- is there a bent pin/short there? See the red dot. Maybe what I am seeing is just an optical illusion, but it looks like a...

Be careful with any data you use in conjunction with the SuperView SCSI adapter (originally intended as a PowerBook big screen expansion) and make sure you have a backup. It may have a gremlin bug that could completely corrupt the mac hard drive (or maybe it is related to user error and SCSI ID...

At primary INIT, the board you have is in 1-bit mode and the CLUT is being programmed for red (0) and gray (1) to display the SuperMac splash screen. Earlier SuperMac boards programmed the CLUT to black/white and used a half-tone gray screen and black banner (various Spectrum boards - Spectrum/8...

The Spectrum/24 Series III and Spectrum/8 Series III boards have unique ROMs, use different/newer components vs. the Spec C/SE30 boards (the SMT01 vs TMS) and the Spec C/2.0 ROM is not compatible. The design of the Spec/8 Series II SE/30 board is similar to the Nubus version and the ROM is...

Obviously needs a propagation delay for something -- maybe reset/POR related.

I don't know the organization. I'll think about it and/or try to find out. Spec/24 Series III was 24-bit acceleration. There were different transfer modes and programmable registers, etc., so there might be some splits. But, I mostly think it has to do with address space for the onboard RAM...

Blind debugging is hard work. The problems with not erasing and blit artifacts could be bad address translations on the accelerator. So, I think it still maybe points to the GALs. Given that you see the board come up bad, that the problem goes away and doesn't come back once it's gone, and you...

Hi - Didn't see these messages earlier. Below are some things to consider - maybe with some repetition vs. my earlier posts. The v1.27 ROM should work much better than that v1.11 ROM. Also, when you burn the ROM, assuming you verified it, it should be OK. Make sure you cover the window with a...

Who knows how many were sold, including SuperRAM2 and SuperRAM4? But, along with the drives and some early software partnerships, they helped bootstrap/launch the company. As soon as RAM prices dropped and the SE appeared, they eventually became much less relevant.

You can "easily" create and modify disk images using one of the retro emulators -- like SheepShaver or Basilisk II. I say easily, because there is a slight learning curve for installing the emulators and then figuring out how to make, select and modify images -- but not too bad. Since you have a...

OK - I will try to track it down.

There are a bunch of stock boot images online for all the different emulators, including blank volumes (or take LaPorta up on the offer). No need to create them. Also, maybe consider getting another Floppy Emu so that you can have one dedicated to the Mac side...or even just for that machine.

I think I have a ROM for the SuperMac Spectrum/8 LC from 1991 if you are messing around in LC land.

Attached are some old 1987 ads for the SuperMac SuperRAM2, SuperRAM4 and Enhance. In terms of fans, the MacPlus is very easy to cool. Just open the case, velcro in a couple of modern fans on the inside upper vents and wire them to 5V. If you want to slow them down, put a pot or resistor in...

Use a Floppy Emu in HD20 emulation mode. I may also have one other bit of marketing info on the 1+1, plus maybe some tech info and Q&A. I am remembering a bit more after thinking about this stuff.

More SuperMac history and places you can no longer visit. :cry: Here is a rough outline: More SuperMac history and places you can no longer visit. Here is a rough outline: 950 N. Rengstorff, Mountain View: In 1987, SuperMac was located at 950 N. Rengstorff in Mountain View. It was just down...