Zool won't load with CE on

Maren · 19 October 2010, 12:45

I'm talking about at least 2 of the cracked ADF versions. No problems with the IPF, though. Take the one below for example, after bypassing the crack credits, the screen goes black and the floppy is accessed for a few seconds before everything stops.

Zool (1992)(Gremlin)(Disk 1 of 2)[cr CSL].adf (CRC32:44BDF0E2)
Zool (1992)(Gremlin)(Disk 2 of 2)[cr CSL].adf (CRC32:9D01465E)

Disabling CE fixes the problem.

Get the savestate here: http://filesurf.ru/209998/zool.uss.html

Regards.

Toni Wilen · 19 October 2010, 21:31

Stupid bug. Paula FIFO was not reset when disk DMA was started and previous DMA was still active. (This loader is quite weird..)

Code:

for (int i = 0; i < 3; i++)
 fifo_inuse[0] = 0;

..

Galahad/FLT · 19 October 2010, 21:41

That loader is beyond weird and shit. If its the one I think it is, its ridiculously slow to load the game.

Toni Wilen · 20 October 2010, 10:57

I guess crackers didn't have space for full track buffer because loader uses sector sized DMA, then immediately polls DMA'd data and either accepts the sector (if header sector number matches) and continues decoding the rest or aborts the DMA immediately and restarts until correct sector is found.

Confusing part is unused doublebuffered sector buffer (two buffers, pointers swapped after each sector). Both DMA and MFM decoder use same buffer pointer..

Start DMA to buffer1, poll word at buffer1+6 until contents are non-zero, read 2 MFM longs, zero read longs, MFM decode and back to polling until all data has been read. Swap buffer pointers and continue..

19 October 2010, 21:31	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,518	Stupid bug. Paula FIFO was not reset when disk DMA was started and previous DMA was still active. (This loader is quite weird..) Code: for (int i = 0; i < 3; i++) fifo_inuse[0] = 0; ..

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19 October 2010, 21:41	#3
Galahad/FLT Going nowhere Join Date: Oct 2001 Location: United Kingdom Age: 50 Posts: 9,004	That loader is beyond weird and shit. If its the one I think it is, its ridiculously slow to load the game.

20 October 2010, 10:57	#4
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,518	I guess crackers didn't have space for full track buffer because loader uses sector sized DMA, then immediately polls DMA'd data and either accepts the sector (if header sector number matches) and continues decoding the rest or aborts the DMA immediately and restarts until correct sector is found. Confusing part is unused doublebuffered sector buffer (two buffers, pointers swapped after each sector). Both DMA and MFM decoder use same buffer pointer.. Start DMA to buffer1, poll word at buffer1+6 until contents are non-zero, read 2 MFM longs, zero read longs, MFM decode and back to polling until all data has been read. Swap buffer pointers and continue..

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