lector
Graphic
P13shwriter
II
Board
TABLE
OF
CONT~~'~
i:
.'
Hepa;
r
j\,S
re(:r:1ent
TaDle
of
Contents
Ie
Int:c6ccticn
02scription
of
the
Board.......
...•.....
1·
~2
~esc~~ption
of
the
Manual
6
•••
~_~.~.n
~
..
~
',,:::C'-':/
cf.
Operation
",
"
r.-',
"
_~
i:~'
(':'
\;'
b
_I
rrdPo;.·· t6
-.;:
It; '1'
~
II>
"
eo
••••
, "
.',
0;
*'
, . -
"
.....
~.
~~
~;cd;,:oi",·.:al
Sync
Circuitry
•..••
c
•••••••••••
"
c·.
<
2.
j
Vert~cal
Sy~c
Circuitry
•••..•••.••••.••.••..•..•
~-~
),':;
':2:.,c:"yl\ddress
Multiplexer
,.G.,
••
,
',c'
2 • 5
(-'.2;(,0
ry
La
t c h 0
••.•••••••••.••••••.•
,.
• • • • • •
•.
••
.',
- • " • "
,:."
•
2.6
Char~cter
Generator
and
Shift
Register.....
,;·3
c.~
M0oilor
ROM
Circuit
••.•.••.•.•••••..•..••.••..
III,;
:Jserls
Gui·de
3.1
Modifications
to
the
Standard
Co
,1
fig
u
rat
ion
••••••••••...••••.••..•.
"
...
'
•...
~.!.J
Creating
a
New
Character
Set
•••..•..
~,,1.'2
Changing
the
Address
of
Video
rVje=-~,;:):cy.
3.;
.
.:\
P..1tting
a
Monitor
PROf"'!
on
the
BOEd:-C
3.100
Address
of
the
Monitor
PROM
on
the
30
a
i:"
dt
•••
c •
,_
0;
('r
(_
"
~.
(
.-
.j
..
~
.'.
.
..
.~.
~-
~;
3.
*
1.
.G
3,1.'7
3.
L8
3.1.9
3.1.10
3~1.-ll
3 •
.i.
•
12
S?ec~fying
whether
M0nitor
PROM
cn
Board
is
2708
or
272.5
••.••
,
E
r:.a
'~,,:
..
~.
i
;l.g
a ]
~ITI~)
0nft
e~:;
et
..
~
~.
C<
..
~,
q.
I>
..
.,.
••
Chang
~
ng
the
Keyboa
rd
Pc'
rt
l\dd
r
ess
..
, ,
Changing
the
Polarity
of
the
Vertical
Sync
Sign.:]
.•..•.
Obtaining
MWRITE
•.•...
o
••••••••••••
Changing
the
Polarity
of
the
Keyboard
Strobe
••••.••.•••
,."
.•....
,"
~
Using
Interrupt
Driven
Software,
•.•
"0 "
••
,~-~~,
Supplying
a
Keyboard
wi~h
a
Negative
Vol';;'age
Powe:'
SuppI~'
..
Usi~g
a
Spare
Key
on
the
Keyboard
fol.'
Reset
'.'
•.••
0.'
.,
Accessing
the
60
Hz
Veitical
Blanking
Signal
.••••.•.....
".
i- .
",
(";
/·i
iJJ
':j
