Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
06982 Gameplay Critical (emulation) Always May 24, 2018, 14:46 May 27, 2018, 21:53
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) May 24, 2018, 15:06 Uploaded by MrGW
There are no relationship linked to this issue.
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May 27, 2018, 15:28
Mea culpa. I've fixed this in 9b27fcb332a195a41a5b8caaf89af98486069748.
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May 27, 2018, 21:53
AJR - thank you!