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ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
07361 Sound Minor Always Jun 14, 2019, 02:46 Jun 14, 2019, 17:50
Tester tlindner View Status Public Platform SDLMAME
Assigned To tlindner Resolution Fixed OS MacOS X
Status [?] Resolved Driver
Version 0.210 Fixed in Version 0.211 Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary MESS-specific 07361: coco: Speech/Sound Cartridge music plays fast
Description This cartridge can play stored music. The note length is seems to be halved compared to real hardware. The pitch is OK.
Since the pitch is OK, I assume I have the clock frequency correct.
My current suspect is the timer clock divider in the TMS7000.
Steps To Reproduce I created a test program that measures the length of a short song using different note lengths and time bases.
Download my test disk image:
Start the CoCo with coco3 -ext multi -ext:multi:slot3 ssc -flop1 SSC.dsk
Additional Information The attached picture shows the values produced by the test program on real hardware.
The number to look at are the LEN values. The higher the LEN value the long the song played.
Github Commit
Regression Version
Affected Sets / Systems coco
Attached Files
jpg file icon SSCTEST_Real_Hardware.jpg (103,723 bytes) Jun 14, 2019, 02:52 Uploaded by tlindner
Test on real hardware
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