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sunder

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    http://lisaem.sunder.net
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    ray.arachelian
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    Somewhere in time...
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    68k, PPC macs, emulators

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  1. So I haven't tried this yet, but vintagemicros has an altered LisaLite adapter here: https://www.ebay.com/itm/Apple-Lisa-Lite-Card-Modified-to-Allow-a-2-10-I-O-Bd-to-be-Used-in-a-Lisa-2-5/143173144110 which says it will allow this to work. You can see the modifications are made by two bodge wires:
  2. I've recently noticed that all of my Lisas (Lisae?) are now showing various video symptoms. At least one is a trimpot issue which should be easy to fix. Another the display over time scrunches up at the top, but is otherwise readable and playing with the trimpots doesn't help. Another goes out of focus. So I've also got a bunch to repair. So it seems whatever these issues are, whether capacitor, voltage regulator, or trimpot, or other, this is roughly the lifespan of the analog video boards. I'd like to collect the symptoms and fixes, and catalog these so I can update the
  3. So I've had this issue for a while now, the cable between my 20th anniversary Mac speaker and the main computer seems to be a large twist lock kind of cable that has many pins. After I got the TAM, I hooked it up and haven't separated the speaker base from the main computer since. When we moved house a few years back, I tried to disconnect the cable but wasn't able to, so revisiting this. Do these get stuck? Is there a specific motion to disconnect them without damaging them?
  4. Might be interesting to replace that FAT12 with something that supports more than 8.3, not just larger volumes - but yeah, that's going to be insanely hard and you'll have to change a lot of the underlying CP/M code, etc. as well as the GEMDOS side and certainly the apps too. FAT32 is likely going to be an insane effort because it's a hack where a file takes up as many 8.3 file entries on top of the original as it would take to store the name. Oh well. But yeah, you'll likely want to create a for-loop that passes VIA addresses one by one for each of the 7 possible locations, trap
  5. I don't know of any, but in general, check each slot for a dual parallel port card, if installed check each card for the OCD bit - Open Cable Detect, if the cable is connected, there might be a drive there. If there is a drive there, you can try to probe reading of block 0x00ffffff - this will give you the name and size of the drive, and whether it is a ProFile like or a Widget like drive, but don't depend on the text name, look at the protocol version. Take a look at the Widget ERS for this. If you don't want to deal with the crazy multi-block read/write commands, stick to ProFile-y comm
  6. I'm not sure about the serial numbers, but the Lisa 1 mice had a very narrow button vs the newer ones that were shared with the Mac and Lisa 2's, and also a different DB9 connector hood (no screws). see the photos here: https://www.worthpoint.com/worthopedia/apple-lisa-mouse-a9m0050-early-013519-1863798648 There's a few of these on ebay that are super expensive as well. There is a formula for the serial number of Lisas that tell you the manufacture date and plant in a document called "Good Things To Know About The Lisa.pdf" from SunRem, but not sure that a similar
  7. To quote Zoidberg, "I'll take 8!"
  8. On the Mac (and even LOS), the A-Line traps are almost fully used. You could cheat and use some of the F-Line traps that aren't used by the FPU or PMMU, or perhaps use some other mechanism if GEMDOS allows for it.
  9. Pity, they missed an opportunity here to call that error something a lot more fun: Major Havoc
  10. Can you modify the boot loader such that it zeros RAM before it loads the BIOS/BDOS? You should be able to get max ram from the Lisa BIOS low memory globals at 0294: 0000| 0000 0294 MAXMEM .EQU $0294 ;MAX MEMORY ADDRESS + 1 Generally the Lisa's BOOT ROM will load the boot block around address 2000 depending on which device is selected/options ROMs are loaded, but you should be able to know from the boot loader where the boot loader ends, so use that as your start address and zero RAM all the way to MAXMEM-1 using a DBRA loop.
  11. Thank you @fri0701 taking a look now
  12. yeah, I vaguely remember that HD disks will not work fine because of the coercivity or whatever it's called in low density drives back from the commodore days. I used to order floppies from a bulk maker and for a while the DS/HD were cheaper than DS/DD, but they didn't work well at all in C1541s for example. Perhaps other brands of DS/HD will also work if the disk is degaussed first. This is kinda like punching the R/W hole on the other side of the disk so it can be used as a flippy, but taken to the next level of complexity.
  13. So did DS/HD floppies work well to hold data or did you need to switch to DS/DD?
  14. Love that command's name! And yes, fond memories of BBEdit back when I was still on an actual mac.
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