Tricks to speed the Vdp up.

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By Metalion

Paragon (1622)

Metalion's picture

10-11-2016, 11:43

Pippo wrote:

Dear Metalion,
please, can you answer to my question?
(It was for you). Smile

Sorry but I just saw your message ...
However, NYYRIKKI replied perfectly to your question Smile

By Pippo

Hero (521)

Pippo's picture

10-11-2016, 16:18

Thank you Nyyrikki and Metalion and excuse me, my reply will be later.
I'm very, very busy, unfortunately.
Please, please, wait.... Smile

By Pippo

Hero (521)

Pippo's picture

11-11-2016, 09:01

Hello Nyyrikki,
thank you very much for your wonderful explanations.
But I am not an expert.
I used a simple HMMM command and, in Msx-Basic, it could be this:

COPY (2,90)-(255,121) TO (0,90)

It is repeatedly executed.
Please, can you kindly, if it is not too much disturb, show me a little Assembler example with Vdp interrups in order to make smooth my text scroll?
Many, many thanks for your patience. Smile

By NYYRIKKI

Enlighted (6016)

NYYRIKKI's picture

11-11-2016, 10:17

Yes sure...

In this example I change screen background color, but instead of calculating borders & changing colors I could simply just adjust the screen position and be done with the task.

By Pippo

Hero (521)

Pippo's picture

11-11-2016, 13:27

Thank you Nyyrikki, thank you very much!! Big smile
You and Latok are my heroes! Smile
Thanks a lot to the others as well. Smile
I'll try to use those instructions for my scroll.
I hope to succeed.... Smile

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