[Info-vax] Simh Licensing question 3900 vs 780

[Bob Eager]

On Sat, 24 Oct 2009 16:21:35 -0400, JF Mezei wrote:

> 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

Your version doesn't have the PTR device (paper tape reader).

All it's doing is attaching a device to the file as a crude way of 
patching the byte at offset 4 from 2 to 1. Any other method would work, 
e.g. adb or similar.

But in your case, just use a device that *does* exist. The TS tape device 
will work, so:

  sim>set ts ena
  sim>att ts ka655x.bin
  sim>ie ts 4
  4: 02 1
  sim>det ts

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