[Info-vax] Simh Licensing question 3900 vs 780

[Wilm Boerhout]

JF Mezei mentioned  on 24-10-2009 22:21:
> Wilm Boerhout wrote:
> 
>> But you can change the VAXserver 3900 to a MicroVAX 3900 so it will 
>> accept A type licenses. See the SIMH FAQ (not the SIMH VAX FAQ)
> 
> Ok, so I looked it up :
> 
> ##
> The system type is controlled by a "magic byte" in the CPU's boot ROM.
> By default, the system type is a VAXserver 3900. To change the type to a
> MicroVAX 3900, patch the boot ROM as follows:
> sim> set ptr ena
> sim> att ptr ka655x.bin
> sim> ie ptr 4
> 4: 2 1
> sim> det ptr
> ##
> 
> 
> Unfortunatly, in my universe where everything works just a tad differently:
> 
> bash-3.2# bin/vax
> 
> VAX simulator V3.8-1
> 
> sim> set ptr ena
> Non-existent device
> 
> sim> att ptr ka655x.bin
> Non-existent device
> 
> I guess I will have to read some other FAQ on how to get the commands in
> the first FAQ to work :-( ;0-( :-(

JF, the VAX has no Paper Tape Reader (PTR) device. The SIMH PDP-11 does. 
All that SIMH needs is a read/write binary device to modify the boot 
ROM, so if you just fire up the PDP11.exe from the SIMH distribution, 
and follow the commands, you're set, and the back to the VAX. Here's the 
PDP11.ini file that I used. If you feed this to PDP11.exe, you can 
modify the ROM as specified.

---
set ptr enable
set cpu 11/73, 4M
---

/Wilm