Recent content by stepleton

Lisa video has a horizontal frequency of 22 or so KHz; it's very odd and few monitors sync to it natively. Most people who use the composite jack use something like an RGBtoHDMI to see the video. I've heard of people using a differently-configured RGBtoHDMI to interpret the separated signals...

It depends: even though the garbage isn't much to look at, it's still informative. The screen image is still a raster, so if you see it, that means the video state ROM and other video gubbins are working at least, and that ain't nothing! Here's where you really do want to hear from folks like...

The results are as follows: With only a CPU board, the Lisa turns on immediately after power is applied, and the screen shows garbage: (note: flashing images on the screen) https://photos.app.goo.gl/ss45GQ9gsFnigvCMA With a CPU board and RAM populated, the Lisa still turns on immediately...

We've been talking about it over on LisaList2. It's... not very good right now. It seems to run the Office System well and it has a nice UI, but it doesn't really run most of the other Lisa environments. The person who embarked on the project apparently told the coding agent to boot the Office...

What am I, chopped liver? Sheesh. I'll show you --- I'm going to march right upstairs, pull the card cage out of the 2/10 and yank out all but the CPU card and report back.

I don't think so; sigma7 is an original designer of the XLerator if I'm not mistaken. So what he would provide would be a genuine device and not a clone. XLerators have never been for me as they currently only support MacWorks; the Lisa Office System and other native OSs will not run, and for...

I note a telltale MICRO CONV custom IC, which @finkmac observed on a different board on this thread.

People sure do change. "Citizens will be on their best behavior because we are constantly recording and reporting everything that’s going on." Larry Ellison, Oracle Financial Analyst Meeting, 12 September 2024. He posited in that meeting that AI systems ceaselessly monitoring feeds from...

Alex knows that this device is about the most shut-up-and-take-my-money thing of all the things that should shut up and take my money, so I'm glad to see this posted in front of a wider audience. But just since I worry that the bit in the middle could be missed, I'll boost his questions: Are...

Just saw this: https://www.hackster.io/news/8086yes-s-book-ii-is-a-compact-feature-packed-portable-apple-ii-built-with-ttl-logic-3e4993693215 Has everything you need except serial, as far as I can tell. But there's an expansion slot on the back, so you can add a serial card if you need it.

I'm not familiar with this, though I've noticed that your Lisa uses the "internationalised" three-language phrasing, so maybe it's different to the English I'm used to. Is it possible for you to make a video of what you're experiencing? I'm glad if my comments are helpful! It's always nice to...

Only the boot ROMs are EPROMs. The video state ROM is a PROM and may present more of a challenge. Your plan sounds like a good one to me. I've never tried to make a Lisa disk with a Greaseweazle, so I don't know how well it can work. There's a chance that simply making disks with BLU will work...

Congratulations on your Lisa progress! You're correct that boot ROM 3A means a Lisa set up to work only as a Macintosh. In particular, this ROM works with another ROM (the "video state ROM") that controls video timing and gives your Lisa square pixels instead of the slightly rectangular ones...

I'm having a hard time finding out for SPARC, but yes, it seems per this old thread that MIPS did have it "from day one". So the GUI performance must have owed to something else. One other possibility is that Archimedes windows were just smaller than the ones found on megapixel displays like the...

Would a multiplier be used all that much to make the RISC OS user interface? I think the ARM probably did have a hardware advantage that most other contemporary processors (besides the 386) lacked: a barrel shifter. I don't know how useful it is for colour graphics, but for bitmaps it can really...