Thanks, My Prop was similar except this 
was how I had it strapped for my setup; 

P77   P76
x-x   x-x
x-x   x-x

I changed it to your setup and now it displays key-press 
except, it only responds to 'R' key-press.

>  . . r
Testing SYSTEM RAM @F000-FFFF
RAM PAGE MARCH.
FAILED AT:042A - SYSTEM HALTED

<https://lh5.googleusercontent.com/-OFuepYGOYGU/VOQK1Few3DI/AAAAAAAAABQ/YG2vmwwMXwU/s1600/disp.jpg>

When does it try to boot to the SD card ? 
If you have time, how is your CPU board strapped ?
 



On Monday, February 16, 2015 at 1:45:14 PM UTC-6, Todd Miller wrote:
>
> Booting up Crusty's 8080 CPU board with ver 1 of 
> the Prop I/O card. The Boot loader flys off the screen
> like a key is being held down.  I can see the message;
>
> Altair/Imsai <banner>
>
> <D> Directory
> <R> Ram Test
> <V> View Load
> >
>
>
> First few boots I missed it, too busy looking
> at the SMB, but then caught it out the corner 
> of my eye. Rebooted and stopped the CPU after 
> I saw the menu.
>
> I'm guessing I don't have the Prop I/O set up
> for the correct "status bits" for KEYBOARD 
> in/out.  I recall dealing with this to match 
> it up to my ver Dos.
>
> What should it be set to ?
>
>
> JP8/JP9 all jumpered
> JP10 no jumpers, don't understand...
>

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