0.84u3 [Aaron Giles]

NOTES :
- Hardware: Midway Zeus system

WIP :
- 0.130u4: Aaron Giles fixed MAME asserts during load time in all Midway Zeus sets.
- 0.129u2: Phil Bennett fixed a access violation (debug) for all Midway Zeus sets.
- 0.127: smf identified compatible timekeeper used by Midway Zeus II. Removed all the timekeeper memory handlers, except for 8 bit & changed the drivers to use the conversion built into the memory system.
- 0.125u7: Fabio Priuli updated the Midway Zeus driver which shared some input code.
- 0.122u3: Added layout\crusnexo.lay. Zeus updates [Aaron Giles]: Better documented various bit latches. Hooked up crusnexo lamp board (added layout). Fixed year in MK4 startup test.
- 0.122u2: Zeus2 (+related) updates [Aaron Giles]: Fixed save states for DCS games. Cleaned up Zeus2 waveram handling. Added Zeus2 save state support. Added preliminary model and quad rendering support for Zeus2. Added support to timekpr for the ZPRAM used on Zeus2. Hooked up ZPRAM in Zeus2 games. Hooked up controls in Zeus2 games. Updated poly.c to ensure it is idle before saving state. Added artifical Z offset of -2 to make the full screen show in crusnexo.
- 27th December 2007: Aaron Giles - When I first started working on the Midway Zeus 3D hardware, I was hopeful that the so-called "Zeus 2" chip would follow logically from the original. So it was with heightened expectations that I started looking at Cruis'n Exotica and The Grid, during a couple of free days I had off. Sadly, my wishes did not come true. While the second generation Zeus chip shares a few fundamental concepts with the original, there is quite a lot about it that is very different. For example, the Zeus 2 renders to a 32bpp framebuffer instead of 16bpp, and directly accepts some parameters in the wacky TMS3203x floating-point format rather than requiring the main CPU to convert everything to integers first. But even worse, all the registers and data formats are different, so it's like starting from scratch again. It's been pretty frustrating making progress, but at least I have something to show. The game is "playable" as long as you don't mind not seeing large chunks of geometry and enjoy having your view blocked by the background. But at least textures and colors seem to be mostly right, and the geometry is fundamentally there, if a bit mis-sorted. The Grid is proving even more problematic, demonstrating a fundamental flaw in the TMS3203x interrupt handling that is causing me to rework it in the core and then fix all the other games that use it.
- 0.122u1: Added video\midzeus2.c. Zeus updates [Aaron Giles]: Figured out data format of 2 matrix form. Extracted data for lights. Added backface culling which mostly works but fails sometimes, so it is disabled. Started on some initial lighting calculations. Cleaned up zeus wave RAM accessors. Changed rendering code to allow for greater parallelism on multicore systems. Removed some vestigial zeus 2 hacks. Reduced visible area to remove artifacts. Made right/bottom vertices inclusive to fix some gapping issues. Fixed invasn lightgun offset. Zeus 2 hardware [Aaron Giles]: Fixed ROM loading, added banking support. Separated zeus 2 video implementation from zeus implementation. Implemented direct pixel accesses; enough to get startup screens to show. Hooked up ZPRAM. Fixed digital inputs for crusnexo. Fixed default screen parameters to match the games. Aaron Giles fixed ROM-based DCS2 system to ignore HLE transfers (fixes broken sound in invasn). Properly reduced internal memory on the ADSP-2104 variants.
- 0.121u4: Midway Zeus improvements [Aaron Giles]: Cleaned up video code, removed unnecessary math. Added bilinear filtering. Removed perspective correction. Added proper video timing configuration. Added lightgun support to Invasion. Increased resolution on fixed point math to prevent overflows. Fixed texture addresses to only count even rows. Added missing U/V scale factors. Added solid polygon rendering support. Fixed screen clear trigger. Implemented fade out effect. Added Z offsets. Added support for splitting model commands. Hooked up FIFO empty IRQ to make invasn work nicely. Correct PIC values for invasn. Implemented per-quad texture offsets. Hooked up writes to registers during model data processing.
- 11th December 2007: Aaron Giles - So I've been spending a good amount of time reverse engineering the Zeus chip's behavior. Thanks goes out to the folks who offered to loan me a Mortal Kombat 4 board. So far I haven't had to hack into it yet, but as I delve into some of the more esoteric behaviors of the chip, I suspect I will need to eventually. The board I've been loaned has at least been very helpful to understand what things are supposed to look like. In the past few days I've finally figured a number of things out... First off, textures now appear to be correct in most cases. It turns out there are a bunch of subtleties in the texture handling, including per-quad offsets, independent U and V coordinate scaling, ignoring the low address bit, determining when to make things transparent, etc. Getting these basics figured out means that the games are now respectable looking. I knew Invasion ran on the same hardware as Mortal Kombat 4, but the way it handles models, textures, and interrupts was quite different. I think I've finally reconciled most of it, so the game boots, coins up, and plays, though there are still a bunch of models missing and glitches to figure out. I also need to hook up the light guns so you can actually try playing. Even better, Mortal Kombat 4 is mostly playable, at slow speeds (no serious optimizations yet). Lots of glitches remain, but it fundamentally works, which is pretty thrilling given where I was a couple months ago. As I've been figuring stuff out, I've been adding to the rapidly expanding Midway Zeus wiki page (http://mamedev.org/devwiki/index.php/Midway_Zeus). This is pretty much a brain dump of how I understand the chip to work, and writing it down has helped me deduce a bunch of stuff. Yet there are still a bunch more things to figure out, such as alpha blending effects, lighting, missing bits of models, extra vectors and matrices I don't understand, crashes, weird results, etc. But in the meantime, enjoy some WIP screenshots of Mortal Kombat 4 and Invasion running in MAME.
- 0.121u3: More Zeus improvements [Aaron Giles]: Converted over to 64-bit data and simplified the logic to work more like the hardware.
- 0.121u2: Some more internal improvements to the Midway Zeus driver [Aaron Giles].
- 0.120u2: Added video\midzeus.c and includes\midzeus.h. Aaron Giles made some progress on the Midway Zeus-based system. The 3D command stream is now parsed and the format is partially understood, enough to display some polygons but with incorrect textures in Mortal Kombat 4.
- 0.107u3: ClawGrip updated Midway Zeus games input ports to use IPT_BILL1 for bill acceptors.
- 0.84u5: Brian Troha fixed dipswitches in the Midway Zeus games.
- 0.84u3: Added midzeus.c driver.

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