On 04/07/2012 05:19, Jecel Assumpcao Jr. wrote:
Ethan Dicks wrote:
First
consumer machine with a 3.5" floppy (and/or no 5.25" floppy in
the era of floppies being standard)?
The HP 150 came out two months earlier.
ACT Apricot precedes even that, though not by much. The Wikipedia
AFAIK The Apricot had no true text mode eithre.
The Aprocot vidoe system is a bit strange. There's the normal 'CRT
controller' to address the video RAM and generate timing signals. The
video RAM is 2K*16 bits. some bits of which are used as attributes, but
11 bitsd (I think) are used as the 'chracter'. This addresses an area of
the main DRAM which cotnains the character patters.
Now, you can use that as a convnetional text display. Assume you only
have 256 chracters, load the patterns into the right bit fo the main
memroy, nad put the character codes in the 2K video RAM.
But note that 11 bits is enough to have a differenc chracter pattern at
each fo the 80*24 loctaions on the screen. So you can store a differnet
chracter code in each location and then use the appropriate area of the
main memory to control idividuyal pixels on the display.
I think the Sirius/Victor 9000 does the same thing.
-tony