07209: dai: Since 0.153, assembler based games are not working anymore

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
07209	Crash/Freeze	Major	Always	Jan 20, 2019, 16:01	Mar 27, 2019, 16:11

Tester	wim	View Status	Public	Platform	MAME (Official Binary)
Assigned To	Robbbert	Resolution	Fixed	OS	Windows 10 (64-bit)
Status [?]	Resolved			Driver	dai/dai.cpp
Version	0.153	Fixed in Version	0.208	Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	07209: dai: Since 0.153, assembler based games are not working anymore
Description	0.152 was the latest version on which games written in assembler code were working. They lock up starting from 0.153.
Steps To Reproduce	Download the attached WAV file. Start mess with: mess.exe dai -cass 2bis.wav Type: UT + return Z3 + return R + return The program now loads. After loading is finished, type: G3D9 + return On 0.152 the program runs (with some errors in the graphics and the sound, I will open a separate bug report for that). On 0.153 and all the following versions, the emulation simply stops. On the original DAI computer, the program runs as expected.
Additional Information
Github Commit

Flags	Verified with Original
Regression Version	0.153
Affected Sets / Systems	dai

Attached Files

No.16056 wim Tester Jan 20, 2019, 16:05	The file is too big to be attached, it can be downloaded from: https://drive.google.com/file/d/1vabEs1HtBCKvZ10cswumGshcCXdIQEpw/view?usp=sharing
No.16057 Tafoid Administrator Jan 21, 2019, 06:11	Suspected regression commit: https://github.com/mamedev/mame/commit/1310c56964ab76d4412e732106b5c7f52d8d5213 January 15, 2014 Involving tms5501 and cassettes
No.16253 Robbbert Moderator Mar 20, 2019, 13:38	The program does a check of the transmit buffer status in the TMS5501, however this sometimes returned 0 (not empty) when it was empty. So it would loop, waiting for the correct status which never came.