Need Docs for XT RAM Board...

[Jim Leonard]

Julian Wolfe wrote:
> There's a utility called 'fastv20' that speeds up NEC V20 chips, and fixes a
> compatibility problem with them through software.  I don't exactly remember
> what it does to make it faster, since I don't have the docs in front of me
> right now.  It does do a pretty good job though!

Found it.  I was somewhat disappointed:

   mov     al, 74h
   out     43h, al         ; Timer 8253-5 (AT: 8254.2).
   mov     al, 8Fh
   out     41h, al         ; Timer 8253-5 (AT: 8254.2).
   mov     al, 2
   out     41h, al         ; Timer 8253-5 (AT: 8254.2).
   int     20h             ; DOS - PROGRAM TERMINATION

This is the standard "reduce DRAM refresh rate so CPU has more leftover 
cycles" trick.  It has nothing to do with V20's at all, it works on any 
XT.  I was rather hoping it was something V20/V30-specific.
-- 
Jim Leonard (trixter at oldskool.org)            http://www.oldskool.org/
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