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Re: N8 Beta: socket city...
Hello Sergio,
I looked through the collection but don't have a 12.288. Don't have a
9.216 either and I reckon
that would work better with the 5MHz 82C55 I have ready to try.
Regards
David
On Jul 16, 3:05 am, Sergio Gimenez <zetao...@gmail.com> wrote:
> Hi david , also you can use 12.288Mhz crystal with 19200 baud rate .
>
> Regards.
>
> Sergio.
>
> 2011/7/15 vk5dg <vk...@aapt.net.au>:
>
>
>
>
>
>
>
> > Hello All,
>
> > Just got my bare minimum N8 running. Its got enough chips to get the
> > dbgmon and CP/M A; and B: up with Max's ROM image. No drives yet.
> > Bewdy!
> > All done in just two days with a dose of the flu to slow me down.
> > Now the real fun begins.
>
> > I had to make one change from the drawing because I did not get a
> > 6.144 MHz oscillator block.
> > I used one of many crystals on hand, a 470k resistor and 2x 27pF
> > capacitors soldered under the
> > board across pins 3 and 4 of the CPU. K17 was left out.
>
> > Regards
>
> > David
>
> > P.S. Here is a list of what chips and jumpers used.
> > U3 74LS10
> > U6 74ALS32
> > U8 74LS06
> > U10 74LS14
> > U17 ROM (27C040 in this case)
> > U19 MAX-232
> > U24 74ALS32
> > U34 74LS04
> > U52 CPU (Z8S18016VSC) running at 6.144 MHz
> > U53 RAM (681000 128k chip)
> > U54 DS1210 (or use wire links between pins 1-8 and 5-6)
> > U55 74LS273
> > U57 74LS682
> > U58 74LS138
> > U64 74LS139
> > U68 74ALS138
> > U69 74ALS32
> > U70 74LS174
> > P37 CPU osc (not used by me, xtal under board)
>
> > Jumpers
> > K3 1-2
> > K4 1-2
> > K5 1-2
> > K16 2-3 (128k RAM)
> > K17 2-3 (not used by me, xtal under board)
> > K18 1-2
> > P22 3-4, 5-6
>
> > --
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