[Info-vax] OT: news from the trenches (re: Solaris)

[glen herrmannsfeldt]

Bill Gunshannon <bill at server3.cs.scranton.edu> wrote:

(snip, I wrote)
>> The XT/370 and AT/370 run VM/PC, a customized version of VM/370.
>> The CP (virtual machine) part runs partly on the 370 and partly on
>> the 8088 or 80286, communicating with interrupts and shared memory.
>> I believe the CMS is the same as VM/SP's CMS. 
 
> I never got my hands on one (although there is one on eBay right now
> for a bit more than a grand.  Don't know what you would do with it
> as it was an ISA card and even I have no ISA machines left.)  I always
> thought the only thing the PC hardware provided was device access.
> Terminal, Printer and Disks.

That is about right for the P/370, but not for the XT/ and AT/370.

Also, the ISA machine has to be a little unusual.  I had an AT/370
in an AT clone. For one, it needs to run with wait states and only
at 8MHz, even though the system would normally run at 10MHz.

The AT/370 maps into host memory at 512K to 640K. The XT/370 takes
even more host memory space.  Yes terminal, printer, and disks, but 
much of the processing that is done is S/370 code in real VM/370
is done in 8088 code for VM/PC.  Some years ago, there was a company
selling board sets for a low price, about $30 each. 

-- glen