[comp.sys.ibm.pc] turbo xt mother board software speed switch

shapiro@oucs.UUCP (09/06/87)

In my recent posting I requested info on programming my xt turbo
motherboard to switch speeds without pressing the ctrl-alt-'-' on
the numeric keypad. In a recent issue of PC magazine, V 6 # 16 dated 
9/29/87 I found the solution. the following debug session will
create 3 com files to switch speeds on the motherboard. They are
 
FAST.COM - put motherboard in 8 mhz mode.
SLOW.COM - put motherboard in 4.77 mhz mode.
SWITCHSP.COM - put motherboard in the alternate mode
               if in 4.77 then go to 8 or if in 8 go to 4.77
 
A>debug<cr>
-RCX<cr>
-7<cr>
-n fast.com<cr>
-a 100<cr>
-in al,61<cr>
-or al,4<cr>
-out 61,al<cr>
-<cr>
-w<cr>
-n slow.com<cr>
-a 102<cr>
-and al,fb<cr>
-<cr>
-w<cr>
-n switchsp.com<cr>
-a 102<cr>
-xor al,4<cr>
-<cr>
-w<cr>
-q<cr>
A>

The symbol <cr> represents the pressing of the carriage return key.
 
I hope this will be of benefit to some other users.
 
Brian
-- 
Brian Shapiro, Ohio University Computing  and  Learning Services
Haning Hall, Athens, Ohio 45701   (614) 593-1608
BITNET: shapirob@ouaccvma                 CSNET: shapiro@pdp.cs.ohiou.edu
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