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Mark Pizzolato 5bce9da97c QVSS: Fix to get the VSYNC interrupts to be more reasonable. Addresses Issue #88. From Mike Burke
The vertical sync interrupt generated in vc_svc() was too slow for Ultrix. The driver enables interrupts and then calls DELAY(20000), which I guess is 20ms. This translates to about 10000 simulated instructions, but tmxr_poll works out at ~75000 instructions.  I've added a new unit to simulate just the vsync interrupts activating every 8000 instructions.

This approach will completely disable the ability to idle while the QVSS device is enabled.
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