EnterBootRom

where

rES - is the contents of the ES register upon entry to the bootstrap ROM.
rDX - is the contents of the DX register upon entry to the bootstrap ROM.

Description
EnterBootRom is a system call which appears to:

• allow the workstation type to be set, then
• performs a "warm" boot.
• from the R12.2.0 manual "...transfer control to the beginning of the bootstrap ROM".

The call does not seem to work with IOP boards, and this might be the reason it became undocumented for general use.

In fact, it is now documented in the Restricted (to Unisys) R12.3 Procedural Interface Manual).

I do not know if the cache is cleared when EnterBootRom is called.

Parameter(s)
rES
Setting rES to the workstation type will cause the system to boot with that workstation ID.
A list of workstation-type numbers may be found in the CTOS System Adminstration Guide.

Sample Pascal Program
PROGRAM Boot(INPUT, OUTPUT);
Procedure EnterBootRom (WsType:WORD) ;External;
Begin
  WriteLn('****Enter <Return> to boot****');
  ReadLn;
  EnterBootRom (092);
END.

Disclaimer
This article is provided as is without any express or implied warranties.  While every effort has been taken to ensure accuracy of the information contained in this article, the author assumes no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein.
 

Dale 'Cat' Robinson - catfromdarwin@oocities.com
6 December 1999

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