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Realized the I/O board is facing the right way to do easy testing with the back cover removed and interlock defeated :) I've tested each of the I/O boards I have, and both seems to be showing the correct voltages on the COP chip: Pin 1: Ground Pin 9: 4.86 volts Pin 14: 4.86 volts I think...

An update -- fully recapped the 1.8A PSU, mostly to get rid of the risk from the RIFA's. I've measured voltages on the Widget power connector and can see a nearly-perfect 12 and 5 volts. (Except for pin 3, but 5v doesn't seem to be necessary there). I've created a page on TechTangents caps.wiki...

Funny, I was thinking the thing given the crazy eBay prices! :) Before Farallon was a commercial company, some of its products (PhoneNET and MacRecorder) came from the community in BMUG, the Berkeley Macintosh User Group. Michael P. Lamoureux was a math grad student at UCB and, I believe, a...

I came across this table in a 1990 service guide -- at least for me, it helped clarify things. Having said that, I think there is a contraction between the un-enhanced 512K only working with a 400K drive (in the chart) and footnote 2, which states that a yellow cable will make an 800K drive...

I have a Lisa 2 that worked for many years, but has recently started giving an Error 52 -- and also immediately starting up when powered, instead of waiting for the power button. (Interestingly that light remains unlit despite the machine turning on.) Here's what I've tried so far: 1) Replace...

Before ResEdit shipped as a unified application, Apple had smaller programs that could perform some of the same tasks: Alert/Dialog Editor Font Editor Icon Editor These were part of a "Software Supplement" that seems to have shipped in the summer of 1984 - for the price of $100. Below, a July...

Just to note that I really appreciate your writeups, @Realitystorm! It's a lot of work to track all the various instances of these documents down...

Since some of these links and images have since disappeared, I scanned in the MacClip/PowerClip Jr manual and imaged the June 1995 benchmarking disk: https://archive.org/details/newer-mac-clip-power-clip

Wonderful, thanks so much!

My inspection of the c code so far has delivered the insight that "RasterOps blue/green" is defined as #00dfaa. Still working on the rest of it. :) The logo in the 8LC board code, for example, is defined as a 31x37 array...

Wonder how easy it would be to extract the bitmaps from the c code? If I’m understanding correctly, you used to only see these flash on the screen at boot — it would great to have them as actual files…

I owned a IIsi back in the day and yes, I think this card would have been really compelling if it was in the office and not at home (still had LocalTalk there!). But agree the cost could have been an issue. I only became aware of this kind of card very recently, as part of a project to scan and...

Probably the earliest possible version of JPEGView, as you note, or possibly GraphicConverter? Another option would be to see when DeBabelizer shipped. All of these could be System 7-only, of course. JPEGView predates QuickTime but am not sure about System 7. Anything from around the Fall of...

Interesting new development: http://hackaday.com/2017/05/01/the-raspberry-pi-becomes-a-scsi-device/ The project itself (in Japanese):  http://www.geocities.jp/kugimoto0715/rascsi/index.html Change over to low-density port, and pair this with some disk images on a SD card, you could build a...

So when booting from an external FloppyEmu, and thus having an empty disk drive, I get an audible "disk seek" noise at about 0.5 second intervals.  This noise abates once I launch an application, but returns once the program has fully loaded.  The disk drive itself seems to work fine otherwise...

A few ideas: 1) Are you in 256 colors mode, or 256 shades of grey mode?  The latter is optimized for greyscale monitors and, at least in System 6/7, would display the Apple Menu icon as solid rather than shades of grey. Confusingly, many color elements remain on screen when you use this...

The 68000 on one of my Mac 512k's seems to have had three pins connected to something at one point.   Curious if folks can guess what device/upgrade might have originally been installed?

Anyone know if the original, non-backlit Mac Portable has a fuse on the motherboard? I've seen references to one, but don't know if they might have involved the revised model, and I can't seem to locate any fuses on my motherboard...

A common problem when rooting around on old media is the tedious process of converting MacWrite files for viewing. Oftentimes these are ReadMe files that explain exactly what the software is, or provide other crucial information about what's on a disk. Unlike pure-text documents from...

So actually on the 3.5" CF AztecMonster there's a special note in the manual: Mac Plus does not boot from this card normally. You must cut #40pin RST fuction from flat cable. CF card volume is recommended under 2GB.