Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
06763 Misc. Major Always 30 days ago 28 days ago
Tester demotester View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Other
Status [?] Acknowledged Driver bbc.cpp
Version 0.191 Fixed in Version Build 32-bit
Summary MESS-specific 06763: bbcm : Testing some demos on BBC Master 128!
Description 1) Demo 128 by The Master --> http://www.pouet.net/prod.php?which=56807
- runs fine till loading the 2nd part where hangs!

2) Some Nasty Effects by CRTC --> http://www.pouet.net/prod.php?which=66197
- timing problems! (Note: Check a video captured on a real hardware on pouet link above!)

3) Mode Infinity by CRTC --> http://www.pouet.net/prod.php?which=61849
- timing problems! (Note: Check a video captured on a real hardware on pouet link above!)

4) The Master of Your Old School --> http://www.pouet.net/prod.php?which=55785
- timing problems! (Note: Check a video captured on a real hardware on pouet link above!)

5) Teletextr --> http://www.pouet.net/prod.php?which=70465
- does not start! (Note: Check a video captured on a real hardware on pouet link above!)

6) Sugar Smash --> http://www.pouet.net/prod.php?which=67796
- does not start!

7) Redistribution --> http://www.pouet.net/prod.php?which=53827
- does not start! (Note: This demo is for BBC B model, but should work also on a Master 128 model!)
Steps To Reproduce Start the BBC Master 128 driver and insert one of above demos!
In running driver press SHIFT + F12 to boot the demo!
Additional Information All demos tested to work fine on B-em v2.2 emu!
(Model: Master 128, Video display type: Interlaced, Borders: Full.)

NOTE: On a real machine the BREAK key act as a reset and the ESCAPE key act as a break - what is same on MAME/MESS where F12 act as a BRK key. The problem is now only with the function of F3 key when not in full key mode, as it usually hangs the emu?
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Regression Version
Affected Sets / Systems bbcm
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Notes
4
User avatar
No.14445
Pernod
Developer
29 days ago
All bbc machines are currently marked MACHINE_IMPERFECT_GRAPHICS, and all of these demos rely on video timing and full handling of the 6845 CRTC.
User avatar
No.14446
demotester
Tester
29 days ago
edited on: 29 days ago
At least graphics on the demo 1) seems to not be a problem, but for some others it definitely yes.
The testing of demos documents what demos currently at least partially working and what dont.
Hope it could be of help in future developement in improving the CRTC driver timings.

Not sure are you aware of F3 key problem while in partial keyboard mode!? (It crashes the emu!)
I guess it should behave same as F12 key while in full keyboard mode!

User avatar
No.14447
Pernod
Developer
29 days ago
I'll take a look at the F3 issue, wasn't aware of that. Many of these demos really push the CRTC to it's limits, as do some games. They change the screen dimensions and resolution per scanline which requires exact timing of interrupts. I've looked at improving the graphics a few times but haven't yet managed to get things right, it's high on my list though.
User avatar
No.14448
demotester
Tester
29 days ago
edited on: 29 days ago
All demos have been tested to work fine on B-em v2.2 emu!
(Model: Master 128, Video display type: Interlaced, Borders: Full.)

So it is currently the only emu that can handle all mentioned demos pretty close.
Now not sure is it same possible on MAME!? (regarding needed accuracy)
But hope at least it could be improved more than it is now, if comparing with some other 'mature' drivers.