Re: [N8VEM: 10557] Re: N8 Beta: socket city...

[Douglas Goodall <douglas...@mac.com>]

David,

How about a photo so we can verify the physical location of your jumpers...?

Thanks, Douglas


On Jul 14, 2011, at 11:15 PM, vk5dg wrote:

> 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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