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Recent content by sunder

  1. sunder

    Why Lisa didn't use 8MHz 68000?

    I mean, I wouldn't really use a Lisa to run Mac software anymore* so it's, uh, like comparing apples to oranges, if you'll excuse the pun. MacWorks may well be far more efficient at running a single application vs multiple ones. However, I'd also point out that most of the time, all computers...
  2. sunder

    Why Lisa didn't use 8MHz 68000?

    Hi Tom, sadly no Lisa 3, a color Lisa, or the Whopper made it past a thought exercise phase, so it's all speculation at this point. You are correct, technically you can point the video buffer on a Lisa anywhere within the physical 2MB RAM space, outside of the MMU. So it's not just two screens...
  3. sunder

    Why Lisa didn't use 8MHz 68000?

    I think you're referring to this? http://www.bitsavers.org/pdf/apple/lisa/Whopper_ERS_V2.0_Jul83.pdf
  4. sunder

    Why Lisa didn't use 8MHz 68000?

    Yeah, there's a lot of weird stuff in the Lisa. The most blatant are flops that can be enabled or disabled on reads. These are used to turn on the MMU contexts and memory parity checking tests, for example. That's right, a read is actually equivalent to a write, because it only cares about...
  5. sunder

    Why Lisa didn't use 8MHz 68000?

    I don't think there's anything that checks when the CPU accesses video memory, so yeah, all the time.
  6. sunder

    Why Lisa didn't use 8MHz 68000?

    The video circuitry runs constantly and needs access to 32K of RAM at all times, unfortunately DRAMs at the time of the Lisa's release were not fast enough to allow the video display circuitry to share access to RAM with the CPU at 8MHz, so they slowed the CPU down. It's actually quite a lot...
  7. sunder

    De-serialize Lisa System and Lisa Office Diskettes

    This is correct, I think one of the original docs said to deserialize the LOS install disks, but I feel this is most likely incorrect as it works on previously used disks, only (some of) the tools are protected. It might even be that when the LOS floppy is inserted the OS is merely updating a...
  8. sunder

    De-serialize Lisa System and Lisa Office Diskettes

    Eh, you could have saved yourself a ton of time by looking here: https://github.com/rayarachelian/lisaem/blob/unstable/src/tools/src/los-deserialize.c There's a flag that enables the protection bit (I call it Bozo bit in the spirit of ResEdit) that once cleared will remove the copy protection...
  9. sunder

    TAM cable to speaker stuck

    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...
  10. sunder

    Straightening out DB15M pins on external mac 3.5" drive?

    I've got a 3.5" external Mac floppy drive, but looks like shell around the connector was slightly bent and the pins inside are also bent. I've straightened them as best as I could using a small flat screwdriver but can't get the connector to insert. Anyone have tricks for getting these type of...
  11. sunder

    Is there any way to use a BLU Widget disk image with an emulator?

    Hi, some better news, I tweaked the tool a bit more and now both tags and data is a lot better, I'm able to run the "dir" command in Lisafsh tool and it's also able to recognize the MDDF, likely this is now working, though I don't have time today to test this in LisaEm due to work obligations...
  12. sunder

    Is there any way to use a BLU Widget disk image with an emulator?

    Good news, I found some bugs in the code, it's now producing an image where the tags are correct, however, bad news, attempting to boot from it throws a 10726 error. I found a couple of bugs in the converter program, and now, looking with lisafsh-tool, I see that the blocks that have the boot...
  13. sunder

    Imaging a 68K Mac's hard disk for basilisk/mini vMac

    Do we have a way to take a 68K Mac's SCSI hard drive and turn it into a virtual disk for use with either Basilisk II or Mini vMac? (I know of the copyrom program for ROMs and obviously, Disk Copy can be used to make floppy images.) I've got a nice setup on a Mac hard drive I'd like to be able...
  14. sunder

    840av ports and where to get video ram?

    So, as I posted in the Conquests forum, I was able to get an 840AV motherboard working recently, but I notice the specs say this machine has s-video ports. These sadly look identical to ADB ports to me. Can someone who owns this machine tell me which is s-vid in and which is s-vid out? Did...
  15. sunder

    Quadra 840AV mobo

    For a long time, maybe since 1995 I had a Quadra 840AV motherboard and power supply in the closet. It came from a discarded, stripped machine at work that was being thrown out, and had it's CDROM and floppy drive stripped. Was just been sitting there all this time, and I had forgotten about...
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