>To get RT-11 to deal with two DU controllers, you can either:
>
>2. COPY DU[X].SYS to another name (say, DG[X].SYS), and then SET
> DG:CSR=nnnnnn and SET DG:VECTOR=nnn, where nnnnnn is the CSR and nnn
> is an unused vector in your system. When you create a bootable
> floppy which you want to be bootable on your second controller, you
> must lay down the DG bootstrap instead of DU, since the DU device
> points to the wrong controller.
The problem with this technique is that the handler name is built into
the driver, which is used by XM to locate the extended memory region
used to store data (and other code), and the two handlers would still
have the same name. You would need to SIPP the new handler and search
for all references to the name 'DU' (search for ;rDU) to 'DG' (;rDG).
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com |
| Unix Support Engineering Group | (home): mbg!world.std.com |
| Compaq Computer Corporation | addresses need '_at_' in place of '!' |
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| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
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+--------------------------------+-------------------------------------+
Received on Wed Oct 14 1998 - 20:18:46 BST