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A few other dribs and drabs but nothing substantial.ДЄt that point, IВ figured I'd start disassembling the original ROM and building my own.

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There's the AppleMouse II User's Manual the related Addendum a smattering of old usenet (as far as I can tell) the exists in various forms around the Internet. I've spent some time bringing the SDL build up to snuff, working from the same code base as the Teensy 4.1 so I can directly debug on my Mac.В So to find out how the mouse was supposed to work, IВ started reading all the AppleMouse documentation I could find.

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So when I picked up the mouse driver again, I wanted to do it another way. Which is approximately where IВ put it down in 2019, waiting for some stroke of inspiration.

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But when I booted it, the mouse didn't work, and I couldn't quite figure out how to debug it.

Double-high-res graphics, all 128k of RAM, all on top of PRODOS. I figured that GEOS would be a good way to test the mouse itself.В I'd used GEOS back in the 80s, so I knew what to expect - particularly that it used quite a lot of what the Apple //e was capable of back in the day. which are problems in my interface to the program running on the Aiie. The 6521 code wasn't hard to write, but testing it is a different story the only way IВ have of testing it is by booting something that has mouse support, and seeing what happens.В Which means blindly interfacing the mouse card on top of the untested 6521, and figuring out which problems are bugs in the 6521 vs. It seemed a tedious, but likely robust, way to build it out. My first thought was to implement a soft 6521 and glue it in to the bus then use the real ROM images to provide a driver. It was glued together with a fairly substantial ROM, which not only used the standard 256 bytes of peripheral card space but also page-swapped in another 2k of extended ROM on demand. The card it used on the //e interfaced with the system bus via a 6521 PIA ('Peripheral Interface Adapter') chip. The AppleMouse II was the same mouse used on the Mac 128/512/Plus. Let's start with how the mouse works on the //e. The time has presented itself, and here's the understanding. Which means it's just a matter of time and understanding. With the Teensy 4.1 running the show, things are looking pretty good - I'm running the CPU at 396 MHz, downclocked from the stock 600 Mhz and well lower than the 816 MHz it can run at without cooling. So, quite some time ago I started working on the mouse for Aiie, and was stymied with the lack of CPU power on the Teensy 3 (mostly architectural, based on how I'd designed it). On my list for a good while has been mouse support - mostly because I'd like to add networking support, but most of the programs that have Uthernet card support (which is what I want to emulate) also require a mouse card.

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