I changed some jumpers;
On the CPU board: JP10 2nd from left.
On the Prop I/O board: set P74 bit one & P75 bit two.
Now when I boot, I no longer get a runaway on the display.
I do however get treated with the prompt;
> five dots two spaces five dots.....
Keyboard has no effect.
I did see this in another post of Jeff Albrecht;
For those that have a working board, what is the normal mode of operation in this boot sequence ?
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...