DMA-ybe!

Any discussions related to the creation of new hardware or software for the ZX80 or ZX81
Post Reply
sirmorris
Posts: 2811
Joined: Thu May 08, 2008 5:45 pm

DMA-ybe!

Post by sirmorris »

I have just transferred 10 bytes to zeddy memory via DMA :)

It's not reliable though :(

I don't think that it will ever be a workable solution to loading software on the zeddy. For every 1 successful, clean, transfer there are at least 20 power-cycle resets required.

I'm going back to the simple idea of RAM, EPROM & IO ports. 6 seconds to load 3D monster maze is fast enough, right? :)

-Charlie
User avatar
siggi
Posts: 990
Joined: Thu May 08, 2008 9:30 am
Location: Wetterau, Germany
Contact:

Re: DMA-ybe!

Post by siggi »

Yes, that is fast enough for most zeddy users, who are used to load programs while having a coffee break. :D
I also use such a parallel port mmc interface in my ZX81 laptop, due to its minimal hardware requirements.
But my web-server still runs with the prototype of my fast mmc interface (using a hardware shift register) I made in 2007 and loads 16K programs in less than a second.

Siggi
My ZX81 web-server: online since 2007, running since dec. 2020 using ZeddyNet hardware
http://zx81.ddns.net/ZxTeaM
Post Reply