ZX Spectrum next... Anybody backing ?

Talk about non-Acorn classic computers/hardware/software here (including retro consoles)
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lazarusr
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Re: ZX Spectrum next... Anybody backing ?

Postby lazarusr » Tue Jul 25, 2017 7:26 pm

Just received the latest update. They are apparently adding a DMA controller to the design. I'm not sure how I feel about that. Seems to be a step too far from the basic nature of the original
Speccy.
Last edited by lazarusr on Tue Jul 25, 2017 10:08 pm, edited 1 time in total.

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fordp
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Re: ZX Spectrum next... Anybody backing ?

Postby fordp » Tue Jul 25, 2017 10:07 pm

DMA will be great.for new advanced features the old ROMs will not use it of course.
FordP (Simon Ellwood)
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vanpeebles
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Re: ZX Spectrum next... Anybody backing ?

Postby vanpeebles » Wed Jul 26, 2017 8:01 am

I have an mb02, and I'm sure that had DMA.

Andrew_Waite
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Re: ZX Spectrum next... Anybody backing ?

Postby Andrew_Waite » Wed Jul 26, 2017 5:13 pm

The Spectum-DMA hack that has now been implemented into the 'NEXT' is a modification for the ZX Spectrum that seems to go back as far as the Czech Republic in the 1990s. The Spectrum's Z80 is moved to a daughterboard with a Z80DMA chip and some glue logic inside a GAL16V8, the daughterboard is then connected into the Spectrum's CPU socket.

There is more information on this modification here :

http://velesoft.speccy.cz/data-gear.htm

https://www.youtube.com/watch?v=eiD45DRGtuI

To my mind the idea behind this modification is as brilliant as it is simple, and I wonder if it can be applied to other machines with CPUs that can be tri-stated such as the BBC B+?

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fordp
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Re: ZX Spectrum next... Anybody backing ?

Postby fordp » Wed Jul 26, 2017 6:32 pm

Hoglets FPGA ( previously GODIL) based "6502" would be a good candidate for having DMA added.
FordP (Simon Ellwood)
Time is an illusion. Lunchtime, doubly so!


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