DMA and port 63h

Thread View: alt.msdos.programmer

1 messages

[T] Back to Threads [V] Tree View [G] Group Articles

1 total messages Started by Mats Fraennhagen Thu, 05 Nov 1992 12:27

#599

Author: Mats Fraennhagen
Date: Thu, 05 Nov 1992 12:27

17 lines
927 bytes

Hi!

I have two questions:

 1) Is the DMA-chip faster than using "rep movsw", which takes
     CX*4 clocks(286), when transfering for instance a
     320x200x256 screen from "ordinary" memory to "graphics" 
     memory ?

 2) What function has port 63h ? One bit turns the speaker on and
    off(?) but what about the others.

 /Mats 


-- 
 Mats Fraennhagen 	Email: d91mf@efd.lth.se

Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads