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PDP-8e Running OS-8

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  by Bill Degnan - 08/19/2010 23:39


I purchased a replacement M8650 serial card. Although it was highly customized I was able to restore it to a stock configuration. I replaced the 14hz crystal with a 19.661 crystal and upgraded the card to 9600 baud. The system now boots up with no problem and I have begun learning OS-8, the operating system for the PDP 8 series. To the right is an 11/05 system. On the display terminal is a directory listing of the drive. OS-8 boot screen

The command to load BASIC in OS-8 (with partitioned RK05 drives)


The prompt used by OS/8 is the period ( . )

OS/8 has to partition RK05 disk packs, so you need to remember that when trying to run a program. For example, to run a directory of the A partition in drive 0 type the following command:

.DIR RKA0 [return]

The B partition of drive 1 would be:

.DIR RKB1 [return]

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