[vcf-midatlantic] Pdp-8 focal @ Kennett Classic

David Gesswein djg at pdp8online.com
Fri Jul 7 02:15:55 UTC 2023


Note if your loading a FOCAL program if whatever is sending baudrate is
faster than the PDP-8 transmit baud rate the loading will fail after a while
with buffer overrun. I've adjusted the pot on the TTY clock card to make it
load from a teletype. I'm talking if your using a PC that transmits exactly
110 baud and the PDP-8 actually transmits at 108 baud you have problems.
Loading the FOCAL tape itself doesn't have this problem. 

Note that some versions of the FOCAL tape have two sections so without reader 
run if you don't hit continue quick enough after the first halt you will not 
load the initial dialog.

On Thu, Jul 06, 2023 at 09:45:15PM -0400, Bill Degnan via vcf-midatlantic wrote:
> Saturday at the museum we're going to try to load FOCAL from papertape into
> the PDP-8 system.  12 noon to ?  All are welcome.  Also going to document
> system in detail, measure voltages, etc.
> Kennettclassic.com
> Bill


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