Search results

Probably just one post on 68kmla would have done the trick this time. I don't begrudge someone advertising a video they put some time into, but twice is a bit spammy IMO. Maybe another thing is: consider your audience on this forum? I think a lot of us at 68kmla have heard of the IIe card goes...

Fantastic guide; I don't have one of these cameras (although I used one back in the day) and it was still interesting to see the way it went together thanks to the fine photography. Strange packaging for electrolytics; I've never seen that before!

Thanks! PB 2 is out, and it's electrically compatible with PB 1 and mechanically compatible with the "Cameo" adaptor board that Cameo/Aphid uses. Getting it to work would probably be a week's work of spare-time hobby time, the bulk of it likely in setting up the overlay files and so on. But I...

The X protocol is extensible, and evidently RandR refers to an extension. X programs can ask about or request these extensions from the display server (in this case MacX), which can either supply what the program needs (if it can) or confess that it doesn't have that capability (as seems is the...

See the section in [0] called "NON PHYSICAL FILE NAMES". The "display names" (my term, not Apple's) that you see in the Office System (which is a graphical environment that runs on top of the Lisa OS) are not the real names of files on the disk: those are all given names in curly braces like...

The advice to clean the pots on the video board is very good advice. You can still buy those pots new if that doesn't work, but I bet it will. @maceffects , I don't mean to rain on your sale, and @nickpunt , the X/ProFile is a very dependable, proven emulator worth considering. But there is a...

The PSU problem is almost surely RIFAs. Other PSU caps may be in decent shape, but recapping isn't a terrible idea. The rest of the Lisa will probably be fine --- well, the Widget hard drive probably doesn't work, but that's not the fault of the RIFAs letting go. I had never heard of a Lisa/Mac...

Signetics by the look of it. Per wikipedia:

To be fair, so will the PPC 601-powered Mac ⌛;)

Harsh! I found the post interesting, and I've never really used an Amiga or been especially interested in them. Because I am the way that I am, the various games and demos never captured my attention, and instead it's things like the fact that AmigaDOS was originally based on TRIPOS and the...

Fire up your TIFF viewer: http://www.bitsavers.org/pdf/apple/lisa/hardware/Lisa_2_10_IO_Board/ Or view well-made but reverse-engineered (so maybe less reliable) schematics at https://lisaem.sunder.net/cgi-bin/bookview2.cgi?zoom=0?page=5?book=6?Go=Go

Do the mouse and keyboard work? How are you with schematics? The Lisa boot ROM talks to the COPS through VIA 1, U7C. There is a direct connection between the two. It sounds like you've swapped all the chips there are to swap. Perhaps then look at the connections between the COPS and the VIA on...

Yes, sorry about that. As you probably found, the most recent firmware image is https://drive.google.com/file/d/1waF7hGPlwwuyyrnJ1nzStDPk1nCIjJqG/view?usp=drive_link

The parallel port inside a 2/10 runs faster than the external port on a 2/5, or something like that. (I forget the details even though I knew them fairly well at one point; only around two computers can fit in my head at the same time.) However Alex claims that experimental 2/10 support "appears...

Yes, the PocketBeagle is EOL unfortunately. It was a fun project... IDEfile is a fine and capable emulator that you build yourself. I've had one for over a decade and it works dependably. Since you have a 2/5, you can use ArduinoFile if you feel like building one. One advantage of ArduinoFile...

Fascinating, please carry out more experiments. Hold it from a different part of the board. Prop it up on something or suspend it from something (non-conductive and not statically charged) instead of holding it. Flex the board as you hold it. Press gently on connectors or ICs as you hold it or...

Shifted and repeated video suggests address bits to me. The fact that it's in large chunks suggests high-order address bits (more like A7 or A8 than A1 or A2 or whatever). At this point I'd look at schematics/read the theory of operation document and try to imagine what kind of failure could...

Do you have an oscilloscope? I would give some serious thought to getting your hands on one. Maybe a friend has one you could borrow? There are some relatively cheap options out there now. I naively give that ROM a 50% chance of fixing the issue. We know that the corruption is affected by the...

A tangent: This example isn't as contrived as you might think... The first-gen IBM 1620 computer didn't have arithmetic hardware: it kept tables for addition, subtraction, and multiplication in RAM (not ROM). The IBM development code name for the computer was "CADET", which people joked stood...

Looks like this chip is shown on the left side of the schematic here: https://www.apple3.org/Documents/Schematics/Video%20Logic.jpg When people say "video ROM" for 8-bit Apple-y machines, they are probably thinking of something like a character ROM: memory that stores the bitmap "font" data for...