SPECIAL KEYSTROKES FOUND SO FAR ! = (Paw Key) = (-) @ lower right ( on my keyboard )

(Paw Key) and R or C increase or decrease backlight !
(Paw Key) and X or E increase or decrease LCD screen contrast !
(Paw Key) and H  = Screen / Keyboard / power settings.  No facility to set Char size 
(Paw Key) and M  = Toggles between ( 80 x 25 ) and ( 80 x 12 ) screen mode
(Paw Key) and L  = Backlight on/off toggle
(Paw Key) and S  = Sounder on/off toggle
(Paw Key) and 9  = Scroll lock toggle
(Paw Key) and F1 = retype single char.
(Paw Key) and F3 = Dos line retype . 
(Paw Key) and F5 = @(cr) . 
(Paw Key) and F6 = ctrl + Z
(Paw Key) and F7 = ctrl + @

STANDARD = CTRL + ALT + DELETE = reboot

Under Gwbasic :- (Paw) and F(1) to (9) and (0) =
 F(1) = LIST  
 F(2) = RUN(CR) 
 F(3) = LOAD" 
 F(4) = SAVE" 
 F(5) = CONT(CR) 
 F(6) = "LPT1:"  
 F(7) = TRON(CR) 
 F(8) = TROFF(CR) 
 F(9) = KEY 
 F(0) = SCREEN 0,0,0 (CR)

For other settings use UTIL.COM (v1.2)= 
Set up for Time, Date, Floppy(A?)(B?) , Format C:(D:), Com1 and Com2(?) settings    

Please note even this machine is not Y2K compliant ( wont rollover the year 1999 to 2000 barrier )
So I use the standard fudge of using the last valid years in the 20th centuary as alternatives,
so 2008 = 1997 to get the right day of the week in basic and applications. 
( I am told that later versions of the bios have solved this problem )
This is actually quite a common problem and TSR's do exist to correct dates on old PC's !