TRS-80 Model I

woodelf bfranchuk at jetnet.ab.ca
Sun Feb 4 16:40:11 CST 2007


Tony Duell wrote:

> I thought every PC (maaning IBM compatible) did that. The floppy system 
> in the PC. XT and ZT has a DMA channel associated with it. You ask it to 
> read some secotyors from the current track, it does so and transfers the 
> data into memory, then gives you an iterrupt when it's done. 
Well on some computers, like the COCO the IRQ only is used
to end the cpu polling loop for the floppy.Since the default
OS is CP/M err MSDOS I expect the hardware is not used effectivly.
> 
> I know for a fact that other tasks carry on running on this (slow) linux 
> machine when it's doing floppy drive operations.
> 
> -tony




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