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The 6504's 1024 bytes of memory is battery backed up (this is what the four NiCAD AA's on the I/O board are for.) The 6504's address space is available to the 68000, but in two byte skips as opposed to linearly. One lives in offset of two bytes, the other in an offset of 4 bytes. For example a memory parity error detector, a video scan line interrupt, and the MMU. To make things even more complex, there are special memory addresses that turn on or shut off various flip flops. dual parallel port cards for access to Profile drives On older Lisa's there's also a socket for an Amd 9520
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(In the Mac, the mouse is software driven.) Additionally, the I/Oīoard also has a 6504 CPU with it's own ROM to drive the floppies/twiggy drive.
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New preview version of LisaEm is available for downloading, as well as the first bit of source code (just libdc42 for now.). I'm having a bit of trouble getting printing to work the way I'd like it to. Should have a new release of LisaEm fairly soon. Sorry about that, took me far longer to rebuild this machine than I would have liked.
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Have fun!Īnother day, another hard drive crash. This new version fixes a lot of issues, and I'm sure introduces new bugs as well. Head on over to the downloads page for LisaEm 1.0.0 Beta. Release Candidate 1 is available for downloadīeta 2 is up for OS X, Linux, Win32 users.
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Release Candidate 2 is available for download on the downloads page. The LisaEm User's Guide is available for download on the downloads page. 1.2.0 is ROMLESS!!!ġ.0.0-Release (OS X, Source) is available for download on the downloads page. If you don't have ROMs but wanted to try LisaEm, now's your chance. LisaEm 1.2.0 is now available for download.
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LisaEm 1.2.2 is now available for download. LisaEm 1.2.5 is now available for download. LisaEm 1.2.6 is now available for download. This seems to be CPU related and doesn't seem to have anything to do with the COPS421 emulation. There's one left over bug that causes Lisa Office System to get stuck in the Environments window. 1.3.0 has some serious CPU bugs that I haven't been able to fully remove. Released a version for Raspberry Pi off the 1.2.6 tree here. Released an alpha version of 1.2.7 for macos X here.ġ.2.7 Alpha source code can be found at github here. Released a 2nd alpha version of 1.2.7 for macos X here. Released the second beta version of 1.2.7 for macos X + source here. Released the first beta version of 1.2.7 for macos X + source here. Released the 1st Release Candidate of 1.2.7 for macos X + source here. Released the 2nd Release Candidate of 1.2.7 for macos X + source here. Released the 3rd Release Candidate of 1.2.7 for macos X + source here. Lisa Emulator Project Welcome to the Lisa Emulator Project