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That isn't what I meant, but is also a very worthwhile accessory for your 1400.  I use one to move data back and forth from my modern Macs quickly and easily.  I just format a CF card as HFS+ and I can pop it into a USB CF card reader on something else. Here's what I use in place of the hard...

The inits I've tried definitely break things badly.  I suspect that the ROMs are inaccessible via software as the Radius documentation indicates you need to send the accelerator to them or replace the PROMs to upgrade.

In my 1400, I ended up using a 44 pin IDE to (single slot) CF adapter and a 4GB SanDisk Extreme IV CF card that I had kicking around in my camera bag.  I currently have it formatted as a single 4GB HFS+ partition running 8.6 and it's performing quite well.

@CC_333 Does the engine just cut out completely without warning or does it stumble and then die?  What model year is it?

The first thing I would try here is removing the PRAM battery from the logic board if one is installed.  I haven't observed this missing date and time phenomenon before; usually I see the date resetting to 1904 when there's a clock issue.  Needing to have the system powered on for that long...

There is no file extension for classic Mac OS application binaries as classic Mac OS doesn't use file extensions to determine file type.  The file type and creator code are stored in the corresponding resource fork for a given file.  The exception is when files from/for a different OS/filesystem...

In GM-speak, these are called PCM (powertrain control module) and ICM. (ignition control module) These modules can and do fail, but the failure rates tend to be fairly low compared to other powertrain components.  Based on some of the failure modes, capacitor failure certainly does occur. ...

This post probably could have gone into Compact Macs or Peripherals, but programming EPROMs seems more hacky.  I have a lovely Radius SE Accelerator (16MHz 68020 and 68881) in my SE FDHD and it's got ROM v 1.8 with a date of 1987.  It works mostly okay, but I suspect the Radius ROM isn't totally...

I'd suggest booting into OS 9, making sure the backlight is set appropriately, then restart with the installer CD in the drive.  Make sure to hold down the C key from before the chime until you get a Happy Mac icon or grey Apple logo. (depending on the OS X version)  I wouldn't bother trying to...

I know the state of the mouse button is polled before boot up, as holding down the mouse button during power on will eject a floppy if there's one in the drive.  I tried holding down all four buttons on my Kensington TurboMouse and powering on my SE FDHD.  It stayed on the grey screen with no...

Below I've linked a helpful startup key guide that has saved me much frustration over the years.  The Option key boot menu is a New World Mac ROM feature and your Wallstreet is Old World, so holding Option should just force booting to OS 9 from hard drive.  On the Wallstreet, holding 'C' should...

If I'm installing Mac OS/OS X from CD images, I've found that burning the install CD-Rs at 4x makes for much less frustration.  The higher the CD write speed you use, typically the more error correction the CD-ROM drive has to do when you boot/read the disc.  The disc may pass verification in...

You'll need a DB-25M to HDI-50M (M=male) SCSI cable to connect it to your SE.  Here's an example I found on eBay: https://www.ebay.com/itm/SCSI-Cable-HPDB50-to-DB25-6-ft-HD-50-to-DB-25-SCSI-2-to-SCSI-1-NEW/112543707132  I read the owner's manual for the drive and it can be used with SCSI...

I'm curious if anyone has or has seen a Quadra 605 PDS L2 cache module in real life.  I'm not sure how common these things are.  If anyone has one or has photos of one, I'm very interested in looking at the cache chips on the module to see what speed they are to determine if the module would...

It's worth double checking on your unit, but I checked images of the M2850 and the label on the 100-120v version I found shows 50/60Hz.  This means you can use a step down transformer from the Australian 240v 50Hz mains.  It's important to use a transformer rather than a converter.  Converters...

Stack reduction?  Sounds more like stack overflow!  ;-)

As noted by itsvince725, the 440FX chipset doesn't have SDRAM support, so it needs EDO.  The 440FX was used for the Pentium Pro/Socket 8 and early Pentium II/Slot 1 systems.  In retrospect, it seems a rather  weird regression from Pentium systems with SDRAM support to early  PIIs without it. ...

It sure can.  That's essentially the "Mystic" Colour Classic upgrade/mod.  Before swapping the 575 board in, you can make a small modification to your System file with ResEdit so that it starts up in the right video mode for the CC's analog board/monitor.  This won't affect booting with the...

The product/goop I think you're looking at is often referred to as Silastic, Dow Chemical's trade name for the product.  It's a elastomeric silicone rubber/polymer used both to secure heavy components and support components that stick out from the PCB considerably, such as large electrolytic...

On the 512 byte block size optical drive topic, VAXStations also required it to boot.  I wonder if this was a de facto standard among UNIX workstations of the era?