Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
04187 Sound Minor Always Jan 15, 2011, 01:33 Oct 20, 2018, 13:41
Tester M.A.S.H. View Status Public Platform MAME (Self-compiled)
Assigned To Resolution Open OS Windows XP (32-bit)
Status [?] Confirmed Driver saturn.cpp
Version 0.141 Fixed in Version Build Normal
Summary 04187: colmns97: Missing sound
Description Sound is missing in Columns '97 since MAME 0.126u3.
In 0.126 the sound works and 0.126u1 and u2 the game crashed.
Steps To Reproduce
Additional Information The crash first came about due to the installation of the SH2 DRC in 0.126u1 (r2211)
The fix for the crash didn't fix the sound in 0.126u3 (r2328)

stv.c merged into saturn.c in 0.142u2
Regression Version 0.126u1
Affected Sets / Systems colmns97
Attached Files
related to 05869Acknowledged colmns97: AddressSanitizer: heap-buffer-overflow 
related to 07102Confirmed colmns97: "SCSP MCIEB enabled ffff, contact MAMEDEV" at SEGA screen 
User avatar
Nov 21, 2013, 17:33
It now displays "SCSP MCIEB enabled ffff, contact MAMEdev" right after the patents screen.
User avatar
Oct 20, 2018, 13:41
edited on: 25 days ago
SCSP MCIEB is a side effect of what the game is trying to do behind the curtains. Basically it sends an illegal DMA operation to sound section, causing the lack of sound and those messages.

ETA: Several SCU DMAs are sent to sound RAM sections, most of them with a size of 0xfffff***.
DMA lv 0 max size is known to be 0xfffff, so this is supposed to be an illegal op. Might be a SH2 cache issue or a SCU side effect when choosing that size (backwards? autocorrected?)
fwiw these are the values that the game sends (and a presumed next offset, since I totally suppose that the ending transfer must be linear or close anyway).

(at sega logo)
dst     wrong_size next_offset
5a14fa0 ffb49      c2ce
5a2126e ffbac      9bac
5a2ae1a ffcc2      dcc2
5a38adc ffba8      c9a8
5a45484 ffaa8      c0a8
5a5152c fff84      c614
5a5db40 ffacc      ????
(on easy selection)
5a065d6 ffb44      ????