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This port took less than 24 hours. Unfortunately I don't think it waits long enough for the VDP to react properly so expect a screwed up display when trying on the real thing.

http://gm.64pixels.org/stuff/robotfindskitten-sms.zip

Complete with source. If you manage to get it to run on the real thing, please let me know.

A few questions.
1. Should it wait for a vblank before blanking the display?
2. How long do I have to wait after the display is blanked before I get the nice 8-cycle timing?
3. What ports do I have to be careful of with the 29/8-cycle timing, $BF, $BE, or both?

(btw, this is my old nickname, I generally go by GreaseMonkey nowadays.)

EDIT: Link was dead, updated to my current host.

1. No, you can disable the screen any time you like.
2. Not sure - I'd guess pretty much immediately, but mid-frame stuff is likely to look dreadful.
3. The timing is for VRAM/CRAM accesses. Registers are fair game, but changes may not take immediate effect.

Author	Message
thematrixeatsyou Joined: 27 Feb 2006 Posts: 37 Location: Wellington, New Zealand	robotfindskitten port (not tested on hardware) Posted: Wed Dec 15, 2010 1:08 am Last edited by thematrixeatsyou on Mon Jan 16, 2012 9:43 pm; edited 1 time in total
	This port took less than 24 hours. Unfortunately I don't think it waits long enough for the VDP to react properly so expect a screwed up display when trying on the real thing. http://gm.64pixels.org/stuff/robotfindskitten-sms.zip Complete with source. If you manage to get it to run on the real thing, please let me know. A few questions. 1. Should it wait for a vblank before blanking the display? 2. How long do I have to wait after the display is blanked before I get the nice 8-cycle timing? 3. What ports do I have to be careful of with the 29/8-cycle timing, $BF, $BE, or both? (btw, this is my old nickname, I generally go by GreaseMonkey nowadays.) EDIT: Link was dead, updated to my current host.

Maxim Site Admin Joined: 19 Oct 1999 Posts: 14741 Location: London	Posted: Wed Dec 15, 2010 7:21 am
	1. No, you can disable the screen any time you like. 2. Not sure - I'd guess pretty much immediately, but mid-frame stuff is likely to look dreadful. 3. The timing is for VRAM/CRAM accesses. Registers are fair game, but changes may not take immediate effect.

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