pcjs/devices/pdp11/machine/1120/bootstrap

layout	title	permalink	machines
page	PDP-11/20 Bootstrap Loader Demo	/devices/pdp11/machine/1120/bootstrap/	id type test1120 pdp11

Bootstrap Loader Demo

This machine pre-loads the Bootstrap Loader code into 16Kb of RAM:

<ram id="ram" addr="0x0000" size="0x4000" file="/apps/pdp11/boot/bootstrap/BOOTSTRAP-16KB.json"/>

and then pre-attaches the Absolute Loader tape image to the PC11 Paper Tape Reader:

<device id="pc11" type="pc11" baudReceive="9600" autoMount='{path:"/apps/pdp11/tapes/DEC-11-L2PC-PO.json"}' ...>...</device>

Click "Run" to load the Absolute Loader. When the Bootstrap Loader is finished, it will HALT, leaving the Absolute Loader ready to run immediately after the HALT.

You can then select another tape image in the Absolute Loader format, such as BASIC (Single User), click "Attach" and then "Run".

If you need to start over, select "Bootstrap Loader (16Kb)" from the list of tapes and click "Load" instead of "Attach", re-installing the Bootstrap Loader directly into RAM.

Alternatively, just press the "Reset" button. The RAM component was recently updated to restore pre-loaded images whenever the entire machine is reset. You'll still need to manually re-attach the Absolute Loader tape image, however.

{% include machine.html id="test1120" %}

This machine is also available with our built-in Debugger.