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So: Much to my surprise, the SE logic board harness (from the analog board) uses 22AWG for all wires, even the two +5v leads (orange). In an accelerated SE / SE30, you could be pushing 6 amps over these two wires, which leads to nasty voltage drop! With the original PSUs, you can at least...

Compiled this data earlier today to assist in determining which 68882s are fake (sanded off and remarked) and which are legit. It's usually quite obvious by poor quality of markings, or old masks with new date. Date codes are the last 4 digits of the last line on the CPU center. Given a date...

Got my hands on one of these and reverse engineered it. GAL JEDEC files attached. Vital stats: 47 MHZ CPU (x3 SYSCLK), optional 47 MHZ FPU, no additional cache. Around 2x performance in most benchmarks. Recommend to use with System 6 - 7.1 with stock SE/30 ROMs. Compatibility: Incompatible...

This is a project I've had in the works for a bit in order to support a later project of mine. I expect to be doing a *lot* of reflashing, and removing and re-inserting the SIMM each time I wanted to iterate did /not/ appeal, so this is a 16MB ROM SIMM with onboard programming provided by a Pi...

As mentioned in the ZuluSCSI Pico thread, this is a firmware-compatible derivative of @rabbitholecomputing's ZuluSCSI OSHW with the goal of making the smallest SCSI emulator. It omits the Initiator and switchable termination of the full ZuluSCSI devices, but is otherwise feature-complete...

Figured I'd post some notes here instead about options I tested for cooling a 68040 rather than derail another thread. Per the 68040 datasheet, a heatsink and/or airflow is essential for cooling the 68040 at almost any speed, with some LC models or low frequency models getting a pass. FWIW, I...

Yes, grayscale quickcams have caps - a lot of them. If yours displays digital garbage when opening up QuickPict, you probably need to recap it. How-to: How to open a quickcam. Be very careful with the clips! Remove the lens and inspect the IR filter: mine was both loose and covered in cap...

Figured I'd throw a thread together for my (mostly SE/30-related) nonsense. Background: Many of my vintage machines came from Goodwill back in 2004 - even still have the original stickers from these two SE/30s for $20! But they'd sat idle on my shelf since 2005 or so, and it was time to either...

Through a lucky Yahoo Auctions Japan find, I've got my mitts on one of the most competent video cards for the SE/30 (and IIsi). Resolution support is extensive, it supports resolution changes without reboot, respects sense lines, and goes up to 1152x870 at 24 bit or 1280x1024 at 8 bit. This is...

Here's a quick bit of code to use a Pi Pico as a clock generator. This is an easy way to quickly test a bunch of frequencies without having to have a full fledged signal generator or a bunch of crystals. I can't resist pushing the limits, and a pi pico is much cheaper at $4! Setup: You can...

Does anyone know of any improved monitor utilities for system 7.5? I've got an Xceed card, and its extension is only compatible with Monitors control panel from 7.0. That control panel mostly works in 7.5 though not perfectly. It'd be nice to be able to invoke the Xceed extension without...

https://github.com/ZigZagJoe/Color30HR-ROM In case it interests folks, I have been idly fiddling with the original Micron source dumps in order to get an environment set up that can build a copy of the ROM. I've succeeded in building an exact copy of what I believe is the shipping ROM for the...

So, I find the various accelerator designs for compact macs absolutely fascinating - but there's very little info out there on how the different designs stack up against each other. I figured I'd start a thread to have a place to gather some of that info. Of course, I'm curious about how the...

So a while back, @Bolle worked on a couple Micron Xceed Macrocolor cards with one or more bad VRAMs. He theorized that it was potentially due to these cards living in very close proximity to the CRT anode, especially when stacked on a maccon or one of his clones. This seemed like a sound...

I present: The first time, to my knowledge, that a production model Xceed Color 30 card is running 1024x768 resolution outside of Micron's labs. Not sure there are many folks interested in tinkering with an expensive rare card like this (with the exception of @Bolle), but in case you wish to...

A few weeks back, I could only find a single ADB mouse and had just finished fixing my second SE/30 (or, enough that it booted off a floppy). Being simultaneously lazy and bored, I decided the appropriate course of action was to hack together an ADB mouse out of any pointing device I had to hand...

So, I'm in the process of fixing up two SE/30s that I haven't played with for 18 years.... one is the favorite, and has 128MB of RAM and an ethernet card. So I want to get it 100% internally. I did a full recap job on that one, where the second is being kept as a control as the analog board and...