Added ability to test the instruction/data cache ram. The scratchpad and BIU register are now handled internally to the CPU.
All writes are performed with masks. SWL/SWR used to be implemented with two writes ( one byte and one word ) when writing three bytes, now it only ever performs one. Byte and Word writes use masks as they leave the rest of the register on the bus, which can be picked up by larger registers.
The read/write functions to use are cached when the SR bits are updated, as are the bad address masks.
Added coprocessor 1 & 3 support, though they don't do anything useful.
All loads now go through the delay pipeline, a lwl/lwr will grab the value out of the pipeline if it's updating the same register.
Added undocumented behaviour of BLEZ/BGTZ. The comparison for zero can be changed by specifying an alternate register in the RT field ( the documentation says you should always use register 0 ).
Restricted to 16 COP0 registers & generate an exception if any of the 5 for the MMU are used.
Added BCF/BCT instructions, although I have found no conditions that affect them yet.
Generates an exception if any MMU instructions are executed.
Sets the CE instruction for all exceptions, not just those involving a coprocessor. The bits of the opcode that specify the coprocessor are grabbed no matter what the instruction.
Added TAR register and BT bit in SR. When an exception occurs during a branch, BT determines whether it was taken or not. The TAR register gets set to the destination of the branch.
Fixed the BD bit when you are in a branch delay slot and you didn't take the branch, this shows up in the pipeline as !pc.
Fixed branches within a branch delay slot.
Multiply & divide instructions can be aborted if you write to HI/LO before reading the result.
Added data breakpoints, you don't appear to be able to set breakpoints on any of the addresses internal to the CPU.
Multiply/divide/GTE instructions can execute when an exception is taken, although the EPC indicates that it hasn't. The BIOS avoids rerunning GTE instructions as they are destructive, so you have to make sure they run.
Added bus error handling, PSXCPU is limited to 8mb of ram & any access outside this range will trigger an exception. I believe this is to be an internal limit.
Added CXD8611R as a specific CPU type, System 12 appears to allow more than 8mb of ram & it's possible that this is different.
Mapped out all instructions to either generate an exception or ignore bits.
Updated the disassembler to match the decoding.
Fixed disassembling of branch instructions in a branch delay slot.
Lui checks for a ori/addiu following and will show you the result.
Added step over/out support.
Fixed standalone disassembler.
Note that this is a significan change and some new bugs might be caused by it. Unlikely previous bugs, where extra garbage tiles would appear in the games, the new bugs would be tiles or sprites MISSING--so they will be harder to notice. This would happen because in some cases the 16x16 regions of the gfx ROMs can be used by both scroll2 and sprites, while in other cases they must be separated.
Rewrote INP recording from scratch, since all old INPs are broken anyways.
Header now includes timestamp, which overrides the default time base for MAME's system time.
Each frame recorded now gets a timestamp.
Analog ports are recorded once per frame and interpolated.
Analog port calculations are all done in fixed point for consistent results.
A bunch of other minor tweaks in the input port code.
There may still be a few changes to the final INP format (considering adding
NVRAM data directly in the INP file, for example....) but this at least seems
to work for the games I've tried.
All custom itemids were mapped to class SWITCH. With the recent modification, this implicitly changed to ABSOLUTE.
This fix will use the passed itemid to determine the class.
Subject: patch for state save in buggybjr
Here's a little patch for initial support of state saving in buggybjr.
(It'll help with tx1 and buggyboy too, but they are non-working)
All I did was get rid of the "anonymous" (temporary) timer that was
preventing saving, and replace it with a "permanent" timer. I didn't go
looking for data which might need to be saved.
Subject: pit8253 device
I have converted the pit8253 implementation into a device. To make it
easier to use I've also created a src/emu/devconv.h in the same style
as src/emu/memconv.h.
I do not have all roms/disk images to test all drivers. I have only
been able to test pf2012, filetto, and topgunnr.
Subject: some fix for aerfboot (bootleg of aerofgt)
this fix:
1) spriteram3 (previous value was too high and in the "city" level some build disappear
2) sprite gfx bank (previously some sprite appear right and some sprite was wrong)
3) the zoom is a litlle bit better
4) i have removed multisprite support; in the bootleg aren't present
the remaining problem is "not draw some sprite"; maybe there's a mark in some place
in the code i add, in a comment //, a way to avoid the draw of the sprite (searching a 0000 0000 0000 0000 sprite); this way works quite good but not perfectly (some time too many sprite are in the screen); maybe there's a value indicating the #number of sprite to draw (from the end to spriteram3 to start)
--
From: roberto zandona
Subject: addendum (aerfboot)
this fix perfectly the sprite zoom
Subject: a little fix
a little update: this fix priorities in mermaid and rougien and a sprite bug:
when a sprite have x coordinate >= 0xf0 the value is negative
this fix the sprite bug
+ if (sx >= 0xf0) sx -= 256;
If seems to break Varth, hower, and has dubious effects on the boot sscreens of avsp, sfa3 and possibly other CPS2 games.
01542: 3wonders, 3wonderu, wonder3: Wrong colour of background in game selection and start screens
00410: xmcota: After a couple passes through the demo mode, the background on the qsound screen will go to a shade of green.
