At 04:54 PM 12/18/97 -0500, you wrote:

>> LCD_LINE0 EQU 0x000
>> LCD_LINE1 EQU 0x040
>> LCD_LINE2 EQU 0x014
>> LCD_LINE3 EQU 0x054
>
>These are the RAM addresses of the starting positions of each line of
>the display.
> LCD_LINE0 EQU 0x000
> LCD_LINE1 EQU 0x040
>Now maybe someone else can explain why this makes sense.

A lot of the old LCD's were x 64.  So of course, the second line of text
started at 0x40.  You will notice that 0x14 = 20, so RAM locations 0x00 -
0x13 are the first line, and the second line would normally start at 0x14
except by tradition (and in supporting a degree of backwards compatibility)
the second line starts at 0x40, so the addresses between 0x14 and 0x3F
inclusive for use use a little lower in the display.  The same thing applies
to the forth line's offset from the second line.

Actually I suspect that some simple hacks were done to the early x 64
display controllers, and why change chip designs when they're deployed and
working fine?

Wynn