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I no longer have the paper/invoice, and reordering would be faster. I've resoldered the faulty SIMM several times, even using HotAir, and I'm convinced that one of the two RAM chips is defective. These are all old parts, as they haven't been manufactured for over 30 years.

I had no luck. One is faulty. I order a new one ...

I'm currently testing the 6 SIMM modules in pairs of 2 in my Performa 475 and one SIMM is defective. The lower half of the screen is faulty. Should I try resoldering the faulty SIMM?

I have in the monitor panel under System 7.1 only 640x480 with 256 Color max and with System 7.6.1 640, 832 (256 Color) and 1152 (16 Color) ...

https://www.tindie.com/products/jurassicomp/purpleram-256kb-68-pin-vram-simm-macintosh/?pt=ac_prod_search I think it worked a few months ago. I can only test the Simms in a Performa 475 but I think the Simms are ok ...

I have 2MB of Videoram but the System show up only 512kB of Videoram ...

Yes but is it not a problem, you can build a 9pin to 15pin HD Adapter. The Viking Atari Mega ST Video ECL card need -9 Volt Power from the ECL Monitor to feed. I believe it's the same with the Macintosh ECL graphics card. Video ECL Port are: ECL + / ECL + GND / ECL - / ECL - GND / H-Sync /...

... there are Motorola ECL chips on the card and a 110Mhz quartz so I think it is a ECL Graphiccard and you need a ECL monitor for it or try a ECL to VGA Converter made for the Atari TT computer ... https://shop.inventronik.de/index.php?id_product=28&controller=product&id_lang=1...

Yes that is great. I made a H sync and V sync mod but that can easy remove. Send me your Address and I send you my card. There's no rush, everything has time ...

My graphics card isn't working and I'm trying to figure out why. The entire card uses high-speed 74-series chips. This socketed 74LS258 chip doesn't seem right to me. Otherwise, it's all HC or even F-type chips. Especially since this chip is socketed, which it shouldn't be. Could someone who...

I will path the ROM Simm so the Q650 Mainboard are original.

Thank you both so much for all the tips ... I'll first make a plan first of what needs to be patched on the SE/30 simm so that the simm works in the quadra. I can buy a programmer and a 8MB Simm for 140,- Euro plus tax but I like to build it with parts i have already.

How do I need to patch my 2MB SE/30 ROM SIMM to be able to use it with the Q650? I have a programmer for the 29F040 chips but I have to program each 29F040 individually.

I carefully desoldered the ROM socket from my Quadra 700 motherboard and soldered it into my Quadra 650 motherboard. I also have a 2MB ROM SIMM module that I bought for my IIsi. It contains four M29F040-70 flash chips, so I can reprogram the chips ... I'm now looking for a patched ROM for my...

I put the Mainboard in my Quadra 700 case ...

Suddenly the Mainboard works, which is annoying when it doesn't work and then suddenly does, and you can't find any error to fix. I installed System 7.1 and System 7.6 for testing purposes without any problems. I'm using two 32MB SIMM modules and two 16MB SIMM modules, all EDO, without any...

I initially thought it was due to the RAM, which consisted of two EDO SIMM modules. However, the memory test showed no problems. I also tried two 8MB FPM SIMM modules, but without any improvement. The system installers, whether for 7.5.3 or 7.6, all hang after two-thirds of the installation...

It works better but Mac OS 7.6 and 8.0 Installer terminates with an error, and upon rebooting, a "sad mac" message appears. The computer only boots up fine with a CD image. TattleTech start up with the "error 3" ... ... System Bootup 0000000F 00000028

Yes I install a LC CPU from my Performa 475 I have left over. I install a full 040 and see ...

I buy a faulty Q650 Mainboard and Test it ... The error occurs in almost 90% of all programs started, including a Mac OS installer. There must be a hardware defect on the motherboard. The board is clean and looks flawless.