help on DMA programming

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2 total messages Started by Synectics Medical AB Tue, 31 Oct 1995 00:00

#102

Author: Synectics Medical AB
Date: Tue, 31 Oct 1995 00:00

12 lines
1651 bytes

Hi !! I am trying to program the PC dma controller to do any stupid 
thing...just trying to learn how it works...does anyone have a simple 
-SIMPLE-  code performing something  not too complicated? ( eg: moving into 
video 
memory an image using memory to memory tranfer mode...something not too 
twisted..or just moving in memory a asciiz message and using DOS print 
string function check that is has actually moved...I don't know.)
If possible in C or assembler....

Thanks

Ariel/

Re: help on DMA programming

#101

Author: Jerzy Tarasiuk
Date: Fri, 03 Nov 1995 00:00

13 lines
1831 bytes

>>>>> "S" == Synectics Medical AB <synmedab@algonet.se> writes:

S> Hi !! I am trying to program the PC dma controller to do any stupid 
S> thing...just trying to learn how it works...does anyone have a simple 
S> -SIMPLE-  code performing something  not too complicated? ( eg: moving into 
S> video 
S> memory an image using memory to memory tranfer mode...something not too 

I tried memory-to-memory transfer on many machines, never it
was working correctly (the DMA chip supports it, but machine
doesn't). On present machines it is nonsense - DMA transfer
slows programs (by using bus) more than using CPU for the
transfer. The problem was already discussed many times...

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