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ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
06982 Gameplay Critical (emulation) Always 28 days ago 25 days ago
Tester MrGW View Status Public Platform MAME (Self-compiled)
Assigned To AJR Resolution Fixed OS Linux (64-bit)
Status [?] Resolved Driver coco12.cpp
Version 0.197 Fixed in Version 0.198 Build 64-bit
Summary MESS-specific 06982: Other Coco related drivers: 1bit audio DAC issue
Description William Schaub reported this issue to me after discovering the issue doing some software development. William's comments:

"There are two programs on the 1bit.dsk
SLTON.BIN assembled from slton.asm with lwasm with a listing in slton.lst
This program appears on page 278 of the Assembly Language Programming for the Color Computer (1985) (Laurence A Tepolt).pdf file.
Block at $4000 (16384) of length $003A ( 58): end at $403A
BIN file length: $0044 ( 68)
Entry point : $4000 (16384)
Content length : $003A ( 58)
Overhead : 17.2 %
Single continuous block goes from $4000 (16384) to $403A (16442)

P25.BIN: assembled from P25.ASM with lwasm with a listing in P25.lst this program appears as program 25 in the 6809_ch14_15.pdf file.
Block at $3E00 (15872) of length $0124 ( 292): end at $3F24
BIN file length: $012E ( 302)
Entry point : $3E00 (15872)
Content length : $0124 ( 292)
Overhead : 3.4 %
Single continuous block goes from $3E00 (15872) to $3F24 (16164)

On MAME these two programs are totally silent. On XRoar and a real Coco 2 they both produce sound.
I think somehow the 1bit dac is not being routed properly somehow."
Steps To Reproduce Mount 1bitsound.dsk


... or ...or

You will not hear any audio. You will on a real Coco.
Additional Information Thanks for any help you can provide!
Regression Version
Affected Sets / Systems Other Coco related drivers
Attached Files
zip file icon (9,628 bytes) 28 days ago Uploaded by MrGW
There are no relationsihp linked to this issue.
User avatar
25 days ago
Mea culpa. I've fixed this in 9b27fcb332a195a41a5b8caaf89af98486069748.
User avatar
25 days ago
AJR - thank you!