Vertical scrolling routine (MSX1)

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By thegeps

Master (254)

thegeps's picture

10-01-2019, 19:31

And I'm here again...
the routine is mostly rewritten. Added double buffering, removed a lot of LDDR actions on tiles (now I read the from RAM with an offset). Also added JIFFY polling. No more flickering nor tiles flashing. Thank you all for your hints.
I'm pretty sure I can improve this routine even more. But before do it... I have to download and install openMSX (I'm soooo lazy, LoL) so I can test speed, cpu time etc etc.
Here's the video, enjoy!

https://m.facebook.com/groups/25612789952?view=permalink&id=...

By hit9918

Prophet (2866)

hit9918's picture

11-01-2019, 00:04

I cant see the video.
the first video of the thread I could see.

By thegeps

Master (254)

thegeps's picture

11-01-2019, 01:32

By santiontanon

Paladin (822)

santiontanon's picture

11-01-2019, 05:22

very nice again!! Let us know if you have troubles measuring CPU time with OpenMSX! Smile

By thegeps

Master (254)

thegeps's picture

11-01-2019, 06:59

LoL, downloaded few hours ago. And discovered that I have to search for bios roms etc etc... And I have no idea where. I'll think about that later (now I have to really wake up and go to work XD)

By Wlcracks

Champion (321)

Wlcracks's picture

11-01-2019, 07:40

Put a logic analyzer or a scope to the printer port on a real MSX and toggle it in software. Hannibal

By thegeps

Master (254)

thegeps's picture

11-01-2019, 07:49

I haven't none of them. I have to download what I need. Also I have to beat lazyness... I hate read insteuctions before use a software. But there isn't a user friendly interface so I have to. Sad

By Wlcracks

Champion (321)

Wlcracks's picture

11-01-2019, 08:20

thats the fun of old 8 bit. almost everything you have to do for yourself.

By thegeps

Master (254)

thegeps's picture

11-01-2019, 10:28

Ok, tested on openMSX too.
I had to change all the OTIR instances with someting like:
Loop:
Outi
Jp nz,loop
to avoid garbage...
And all works fine! Big smile

By Manuel

Ascended (15686)

Manuel's picture

11-01-2019, 10:39

On which real MSX were you running the code? (Showing no corruption.)

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