Sharp Pocket Computer PC-1280 Resource Page
Documentation
For manuals and documentation related to Sharp pocket computers in general have a look at the Documentation Section.
System Addresses
|
Address
|
Description
|
|
&FDCD,&FDCE
|
The RESTORE pointer. It is possible to remember the
RESTORE pointer with e.g. B=256* PEEK &FDCE+ PEEK &FDCD
and go to the remembered position with
POKE &FDCD,B-256* INT (B/256), INT (B/256)
|
Accessing the display
The 1280 has a GPRINT-command, which you can use from BASIC. If you
want to access the display from a machine language program, port a
program from other models (witch draw graphics with POKE) or just
access the special function display, then read on:
|
POKE &283C,X
|
|
1
|
BATT
|
|
2
|
-
|
|
4
|
-
|
|
8
|
RSV
|
|
16
|
PRO
|
|
32
|
RUN
|
|
64
|
CAL
|
|
128
|
-
|
|
|
POKE &283D,X
|
|
1
|
-
|
|
2
|
DEF
|
|
4
|
SHIFT
|
|
8
|
DBL
|
|
16
|
-
|
|
32
|
-
|
|
64
|
-
|
|
128
|
-
|
|
|
POKE &287C,X
|
|
1
|
E
|
|
2
|
M
|
|
4
|
RAD
|
|
8
|
G
|
|
16
|
-
|
|
32
|
-
|
|
64
|
PRINT
|
|
128
|
-
|
|
|
POKE &287D,X
|
|
1
|
jap.
1)
|
|
2
|
jap.
2)
|
|
4
|
SML
|
|
8
|
DE
|
|
16
|
-
|
|
32
|
-
|
|
64
|
-
|
|
128
|
-
|
|
1) Japanese character, looks like 'Pi'-'Tau'
2) Japanese character, looks like '+'
Note, that I wasn't able to locate the busy-flag, because this
is reseted by the sharp operating system after performing the POKE.
The flag may be located with a little machine language program,
but this wasn't important enough for me to implement it. If you
have done it, just mail me your result ...
Remember, that switching the display may activate the corresponding mode
e.g. switching "SHIFT" on will cause the next key you press to activate the
orange-coloured symbol.
To access the display blocks just write to the display memory:
POKE Addr,Pattern
The display columns have addresses as shown in the table below:
|
Characters pos. 0-11,0
|
Characters pos. 12-23,0
|
|
&2800
|
&283B
|
&2A00
|
&2A3B
|
|
|
Characters pos. 0-11,1
|
Characters pos. 12-23,1
|
|
&2840
|
&287B
|
&2A40
|
&2A7B
|
|
As you can see, the display is divided into four block, all
addressed bottom up.
Calculating the column pattern:
|
The pattern is calculated by adding the value of every pixel you want
to display in black together, e.g. the second column in the picture at
the right side would be 4+32+64=100. If you want to display the figure
at the right side at character position 0, you would use
POKE &2800,2,100,29,100,2
If you want to display the figure at the right side at character position
9, you would use
POKE &282D,2,100,29,100,2
|
|
If you want to keep the display stable for a while, just insert a waiting
loop:
FOR I=0 TO 200:NEXT I
Unlike most of the Sharp pocket computers, the PC-1280 has no nasty
side effects at the right side of the display while doing direct access
to the display memory. With this model it is not necessary to turn the display
on with a CALL, because it is not turned off during calculations.
Here's an example which fills the display from the left to the right
with black columns, first the upper line, then the lower line:
20 FOR I=0 TO &3B
30 POKE &2800+I,&FF
40 NEXT I
50 FOR I=&7B TO &40 STEP -1
60 POKE &2A00+I,&FF
70 NEXT I
80 FOR I=0 TO &3B
90 POKE &2840+I,&FF
100 NEXT I
110 FOR I=&7B TO &40 STEP -1
120 POKE &2A40+I,&FF
130 NEXT I
Programs
Have a look at the PC-1280 File Archive.
To avoid minikeyboard typing, first have a look at Tools to link your pocket computer to your big PC.
