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Re: Can ZX81 load progs directly from MP3 player?
Posted: Thu May 29, 2008 8:44 pm
by yerzmyey
Hehe, I can see "oldschool techno" in Your profile.
I like it too.
"James Brown is still alive"
heheheh.
Anywayz.
I will point it to one guy who maybe would be able to make such interface basing on the schemes etc. However I will have to wait for my ZX81 to come by post.
Re: Can ZX81 load progs directly from MP3 player?
Posted: Wed Jun 11, 2008 8:19 pm
by Andy Rea
A Question for SirMorris.
Re. MMC interface.
To Clarify a few things if you please.
1. I need 3 bits latched output + 1 bit input I/O capability on my ZX81 to work with MMC interface ?
2. The code can be assembled to work in the 8-16K region (assuming Ram is fitted?)
3. Could i ask where you sourced your MMC sockets from ?
My intention is to build simple-ish external module which includes the 8K static ram Mapped to 8-16K,
Regards Andy
Re: Can ZX81 load progs directly from MP3 player?
Posted: Wed Jun 11, 2008 9:55 pm
by sirmorris
1. I need 3 bits latched output + 1 bit input I/O capability on my ZX81 to work with MMC interface ?
Correct.
Out: Data, clock, chipselect [even if only one card]
In: Data
2. The code can be assembled to work in the 8-16K region (assuming Ram is fitted?)
Correct.
That's where mine runs from at the moment. You only need to alter two routines to get it working with whatever hardware you have.
3. Could i ask where you sourced your MMC sockets from ?
http://www.crownhill.co.uk. A couple of quid for the socket & 1.50 postage. Not bad.
My intention is to build simple-ish external module which includes the 8K static ram Mapped to 8-16K,
If I may be so bold might I suggest having eeprom in there. I'm bored of losing the contents of my BB ram and having to reload the driver
Keep me posted - this is one of my favourite subjects!
Re: Can ZX81 load progs directly from MP3 player?
Posted: Wed Jun 11, 2008 10:10 pm
by Andy Rea
Cool Thanks for that, i'll order a few bits from them.
I was wondering about putting an eprom in there too, maybe switchable so i can copy the code to main ram, then switch 8-16 to ram, and copy the code back again, wonder if i could arrage some kind of bootstrap so it would happen on power up ? Food for thought anyway.
Regards Andy
Re: Can ZX81 load progs directly from MP3 player?
Posted: Wed Jun 11, 2008 10:46 pm
by sirmorris
Maybe 4k rom & 4k ram..? 4k should be enough for anyone, right?!
If you've got a big rampack then the 4k ram could be used for code, and the data required can sit above 32k.
Switching in and out? naah. Switch on, load 3dmm.p, play, reset, load zxgal.p, play ..