08071: czeroize: [possible] Graphics start messing up at number 50.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08071	Graphics	Major	Always	Sep 2, 2021, 04:11	Sep 4, 2021, 23:09

Tester	Dullaron	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10 (64-bit)
Status [?]	Confirmed			Driver	dataeast/decocass.cpp
Version	0.235	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08071: czeroize: [possible] Graphics start messing up at number 50.
Description	Here is a video that I made showing the graphics issue on the countdown. I had to start the recording before it get to 50. I already know there is no dump of the czeroize.pro. Is this the issue? Should be flag yellow?
Steps To Reproduce
Additional Information
Github Commit

Flags	Possible
Regression Version
Affected Sets / Systems	czeroize

Attached Files

No.19208 Tafoid Administrator Sep 2, 2021, 05:11	The graphics malfunction you mentioned is documented in the MAMEINFO.dat file and is expected. Whether or not it is correct behaviour from the original cassette load on original hardware, I'm not 100% sure. - The tape loading counter starts at 142 and the graphics messed up at 50, because some data are loaded into the character/sprite generator RAM area. The .pro file is the protection dongle which has not been dumped. There is simulation in place at this time until such a dongle is found. As documented in the src\mame\machine\decocass.cpp file: /* * FIXME: remove if the original ROM is available. * The Zeroize 6502 code at 0x3707 issues LODCTRS with 0x8a, * and expects to read 0x18 from 0x08a0 ff. within 7 bytes * and 0xf7 from 0x8a1 (which 0xd is subtracted from presumably in order * to form a NOP of 0xea). * This hack seems to be sufficient to get around * the missing dongle ROM contents and play the game. */
No.19209 Dullaron Tester Sep 2, 2021, 05:37	ok I will mark it red flag in my notes.

No.19208

Tafoid

Administrator

Sep 2, 2021, 05:11

The graphics malfunction you mentioned is documented in the MAMEINFO.dat file and is expected. Whether or not it is correct behaviour from the original cassette load on original hardware, I'm not 100% sure.

- The tape loading counter starts at 142 and the graphics messed up at 50, because some data are loaded into the character/sprite generator RAM area.

The .pro file is the protection dongle which has not been dumped. There is simulation in place at this time until such a dongle is found.
As documented in the src\mame\machine\decocass.cpp file:

/*
* FIXME: remove if the original ROM is available.
* The Zeroize 6502 code at 0x3707 issues LODCTRS with 0x8a,
* and expects to read 0x18 from 0x08a0 ff. within 7 bytes
* and 0xf7 from 0x8a1 (which 0xd is subtracted from presumably in order
* to form a NOP of 0xea).
* This hack seems to be sufficient to get around
* the missing dongle ROM contents and play the game.
*/

No.19209

Dullaron

Tester

Sep 2, 2021, 05:37

ok I will mark it red flag in my notes.