rbelmont.mameworld.infoArbee's WIP Emporium

This page will include WIP screenshots and other fun stuff for MAME™, M1, and whatever else I’m working on. 10/1/2023 Important advisory on MAME 0.259 MAME 0.259 will lock up the app if you use 3.5″ floppies on at least the Apple II and Mac. This may also impact other systems using 3.5″ disks such as the PC, Amiga, and Atari ST, but I haven’t verified that yet. MAME 0.258 does not have this issue, so hopefully we will be able to have it fixed shortly in the git master. Posted by Arbee in General @ 8:04 pm -9/26/2023 That ain’t workin’, that’s the way you Apple MAME 0.259 is coming up in a few days, and we haven’t done an Apple update in a while so let’s cover what’s happened in Apple-land since my last post on May 31st. Starting off with 0.256 work done in June , the Apple custom real-time clock chips used in early Macs (the Quadra 800 in 1991 was the last Mac with one, and it was already kind of an outlier by that time) had been broken by a mis-optimization and would act weirdly in time zones other than US East Coast. That was fixed. Next up, in Apple II land , I added support for the Apple ROM firmware card. This card works similarly to the common 16K Language Card, except it has ROM instead of RAM. And the ROM was socketed so people could and did make up all kinds of wild configurations. (Hey, it was the early 80s, everyone had an EPROM burner. That’s the milieu that produced Tron and Neuromancer). In MAME you can configure it in two boring stock ways: Autostart Monitor + Applesoft BASIC, which turns a 48K Apple II into a 48K Apple II Plus, or Original Monitor + Integer BASIC, which turns a 48K II Plus into a 48K original II. But you can also customize it, and this time without a UV EPROM eraser. Just supply a 12K binary file and it will become the ROM of the emulated Apple II or II Plus. For July’s 0.257 release , the big news was that the Quadra 700 gained both working video and working SCSI, making it the first 68040 Macintosh officially considered working in MAME. This meant that for the first time you could properly run Mac OS 8.0 and 8.1 in MAME. Including in Japanese with KanjiTalk. That was followed quickly by the second-generation Quadras: Quadra 800, Centris 610, Centris 650, Quadra 610, and Quadra 650. Centris” was a short-lived attempt to have a midrange brand which quickly failed and so the machines got minorThat’s been fixed. Crashes and hangs with the IIgs games GBA Basketball , Paperboy , and Zany Golf have been fixed, thanks to everyone’s favorite code golfer, qkumba. Ensoniq ES5503 sound on the IIgs (and the Ensoniq ESQ-1 and SQ-80, because we emulate those too!) is even more accurate. In Mac land, it was The Final Cleanup. For those unfamiliar, when I originally got a bunch of Macs working circa 2011-2013, I jammed them all into the existing Mac driver (mac.cpp) regardless of if they had much in common other than being Macintoshes. This led to a giant unmaintainable blob and so a year or so ago I started splitting it up and emulating the shared major ASICs as separate devices (in MAME, a device is a C++ class with some minor extra powers granted by the core – they’re the key to our current modularity and ability to have freely configurable slots, among other things). Anyhow, after the 0.252 release, mac.cpp had been cut down to contain the Mac II series (minus the IIvx and IIvi, which already moved to their own driver and the VASP” ASIC device which powers them). Next on the chopping block was the IIfx, aka Wicked Fast”. It had recently gotten some work done on hooking up its dual 65C02 coprocessors by contributor AJR so it showed the flashing question mark disk, but still has a ways to go. Now, in its own driver , it can more easily get some love. Last out of the blob were the IIci and IIsi , which are near-twins based on the MDU” and RBV” pair of ASICs. (That’s Memory Decode Unit” and RAM Based Video” if you don’t speak Apple). MDU doesn’t have CPU-accessible registers so there wasn’t a lot of point to making it a device, but RBV was the origin of a pretty long line of Macintosh system ASICs leading all the way into the PowerPC era and it definitely became a device. For the PCI Macs, the Pippin driver was extensively cleaned up and renamed from macpci.cpp to pippin.cpp, because macpci.cpp” was a hangover from when I was going to blob the PCI Macs. Fortunately I realized that was a bad idea before it actually happened. Pippin’s specialized PCI bridge chip Aspen” is now supported as a subclass of the Bandit” PCI bridge chip used in most pre-G3 PowerMacs, and the Grand Central” PCI I/O chip is at the correct PCI address now so the system can find it. Also, I transferred all of the now decade-old Mac technical information from the old MESS blog to MAMEdev.org’s blog. You can access all of that information right here . It’s all been corrected and expanded all the way out to the PowerMac G5s, with the correct chips assigned to some machines that were wrong in the old list. And the list of Apple chips by 3xx-xxxx number is significantly expanded and includes a bunch of Apple II-related chips. What’s happening now for 0.254? I’m working on creating the descriptor-based DMA” device that most of the PowerMacs rely on, which hopefully will lead to hearing the boot beep from the PowerMac G3 and the original Bondi blue iMac. 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