RE: [N8VEM-S100:6335] Re: IMSAI 8080A CPU board help.

Here's how I have my board strapped....

Date: Mon, 16 Feb 2015 19:25:39 -0800
From: litte...@gmail.com
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:6335] Re: IMSAI 8080A CPU board help.

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;

I see his screen has a prompt > with 5/dots + the BOOT BIOS.HEX, INIT_FAT.

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...

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