RK05/RL02 Boot Sequence

From: Fred N. van Kempen <waltje_at_pdp11.nl>
Date: Fri Jul 2 03:01:18 2004

On Thu, 1 Jul 2004, Jerome H. Fine wrote:

> A word of caution - For reasons on a PDP-11 which I don't
> understand, the secondary bootstrap program avoids the
> VECTORS for the console device at 60,64 and for the
> LTC (line time clock) at 100. For all but the MSCP
> device driver, the 512 bytes is more than adequate.
This is to allow those bootstrappers to use interrupt-based
timeouts (ltc) if they want to, and same for papertape-based
loading (console vectors). I have seen only a few bootstraps
actually skipping these locations.


--f
Received on Fri Jul 02 2004 - 03:01:18 BST