Re: Xi 8088 - The improved version of my XT board

[Sergey <skis...@gmail.com>]

Well, I guess you can program DMA to do some dummy refresh cycles. :-)
But even without it the speed is very close to the original PC or XT.

Thanks,
Sergey

On Sep 26, 1:49 am, roman fulek <roman...@gmail.com> wrote:
> Hello Sergey
>
> Thanks. I am more interested in the original "slowness" of PC/XT rather
> than getting high speeds. If it is really only slightly faster compared to
> original then I am in for it. I will definitely want an ISA backplane for
> ATX case too. That's wonderfull idea.
>
> Roman
>
> Dňa utorok, 25. septembra 2012 20:18:27 UTC+2 Sergey napísal(-a):
>
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> > Roman,
>
> > It will be slightly faster even on standard 4.77 MHz because SRAM
> > doesn't need to be refreshed, and so it saves some DMA cycles. But
> > other than that this board support turbo mode, so if you have fast
> > 8088 or V20 CPU you can run it on higher frequency. I was able to run
> > it (the previous version) on 13.33MHz with V20HL CPU.
>
> > Not sure if they Acqutek sells boards to individuals (I would assume
> > so, why not :-). But if they don't there are a lot of other places to
> > find ISA backplanes. Or maybe even construct one yourself.
>
> > If it will be a demand for backplanes, I'll consider designing a Micro
> > ATX sized backplane with 6 slots or so (I have to check how many slots
> > it will fit). But I don't think it will be cheaper to make one than to
> > buy one (say $30 for the PCB, $1.5 for each ISA connector, few dollars
> > for other components, so about $45).
>
> > Thanks,
> > Sergey
>
> > On Sep 25, 10:45 am, roman fulek <roman...@gmail.com> wrote:
> > > Sergey, will this board perform faster than original XT at the same
> > clock
> > > frequency because of SRAMs ? Does Acqutek sell ISA backplanes to home
> > > bilders too ?