05823: coco cocoe coco2 coco2b: -ramsize does nothing for emulation although it does change the .ini file

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
05823	Core	Minor	Always	Jan 3, 2015, 23:01	Aug 29, 2016, 09:39

Tester	Robert Gault	View Status	Public	Platform	MESS (Official Binary)
Assigned To	Bletch	Resolution	Fixed	OS	Windows XP
Status [?]	Resolved			Driver	trs/coco12.cpp
Version	0.157	Fixed in Version	0.177	Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	05823: coco cocoe coco2 coco2b: -ramsize does nothing for emulation although it does change the .ini file
Description	MESS has had the option of selecting different RAM sizes for each of the Coco emulations. This can be done with a command line parameter -ramsize or via a ui configuration menu. It can also be set by an entry in an ini file such as coco.ini . I'm not sure when this stopped working but it did in 0.134b and 0.136b. Please note that this feature still works for coco3 and coco3h emulation but not for coco, cocoe, coco2, and coco2b. However, the range of memory for a coco3 or coco3h is 128K-8Meg while that for the coco-coco2b is 4K-64K. That should suggest why one group works and the other fails. For the coco and coco2 series, the effect of this feature can be shown via BASIC using the MEM function.
Steps To Reproduce	Using mess 0.134b mess coco -ramsize 4096 When emulation starts, enter the command PRINT MEM 2343 The free memory will be shown as above. Using mess 0.157 mess coco -ramsize 4096 PRINT MEM 31015 That last value shows that -ramsize was ignored.
Additional Information
Github Commit

Flags
Regression Version	0.148
Affected Sets / Systems	coco cocoe coco2 coco2b

Attached Files

No.11353 Osso Moderator Jan 4, 2015, 08:23	This regressed between 0.147 and 0.148. Looking at the possible causes, this commit seems the most probable: http://git.redump.net/mame/commit/src/mess?id=d3570cf17645ec5aec710cc377c4b6379434eb3d
No.12293 Osso Moderator Dec 30, 2015, 11:35	The problem seems to be at line 179 of mame/machine/6883sam.h: m_space_0000 has a hardcoded _addrend of 0x7FFF, which doesn't get changed by the emulation according to the chosen -ramsize value.