05774: calchase: Page fault when booting game

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
05774	Crash/Freeze	Major	Always	Nov 1, 2014, 20:57	Nov 3, 2014, 00:22

Tester	Justin Kerk	View Status	Public	Platform	MAME (Official Binary)
Assigned To	crazyc	Resolution	Fixed	OS	Windows Vista/7/8 (64-bit)
Status [?]	Resolved			Driver	pc/calchase.cpp
Version	0.155	Fixed in Version		Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	05774: calchase: Page fault when booting game
Description	GAME_NOT_WORKING, but I'd call this a heavy regression. The game used to boot to attract mode, coin up, and enter gameplay, but now it just shows a "Run time Protected Mode termination" and "Page fault" error message.
Steps To Reproduce	1. mame calchase 2. When the BIOS screen asks you to press F1 to continue, press "s" (mapped to F1 in the controls) 3. Wait for the Windows logo to go away and the DOS prompt to appear 4. Slowly type "boot" and press Enter
Additional Information	In 0.148, the game boots into attract mode and you can coin up and enter the game. (See e.g. Kale's WIP at http://mamedev.emulab.it/kale/?p=1652 ) In 0.149 and 0.150, it still boots and runs but the graphics mode is garbled. In 0.151 and 0.155, it shows a page fault error and dumps you back to the DOS prompt. (386 issue?)
Github Commit

Flags
Regression Version	0.151
Affected Sets / Systems	calchase

Attached Files	calchase_0148.png (146,822 bytes) Nov 1, 2014, 20:57 Uploaded by Justin Kerk
	calchase_0149.png (44,386 bytes) Nov 1, 2014, 20:57 Uploaded by Justin Kerk
	calchase_0151.png (3,856 bytes) Nov 1, 2014, 20:58 Uploaded by Justin Kerk

No.11206 NekoEd Senior Tester Nov 1, 2014, 23:36	I'm going to confirm this, it's a pretty heavy regression indeed.
No.11215 crazyc Developer Nov 3, 2014, 00:22	Fixed in https://github.com/mamedev/mame/commit/414477ee2ca3e85b80509e523721625312e02714 The BIOS stores the ram size in the cmos and it was getting overwritten which was causing the dpmi server to get confused when allocating ram.