Sharp PC-1500 - Page 94

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Bec .a use our character is 5 columns wid e we wi ll need 5 s eparate numbers in the patte r n·
expressi on li st of the GPRINT statement. The numbe rs representi ng the co l umns 1 and 5 must
each specify a single dot in the row label ed 4. Similarly, the numbers representing co l umns 2
and 4 mus t eacli spec ify a single dot in row 2. The final sta tement i s:
GPRINT 4; 2; 127 ; 2;4
The specifi ca t ion of the th ird co lumn (127) is the on ly n umber wh ose de ri vation may not be
imm ediately obvio·u s. The number 127 is the sum of a dot in th e first row (1 ). a d· ot in the second
row (2). a dot in the thi rd r ow (4), and so on . Thus. 127 is 1 + 2 + 4 + 8 + 16 + 32 + 63 and
specifies all 7 do ts in the column. Any pa tten) •nay be created by specifying a r ow or a sum of
se ve ral ro .. -.. s.
If the hexadeci ma l addressing scheme is used. the 7 rov1s of the display are conc.eptually divi ded
in to a l owe r group of 3 r o\\IS and an uppe r group of 4 ro .. vs. Each group is nu mber e d, fr om its t op
row. by powers of two as illustrated be l ow:
1
2
4
8
1
2
4
Thus, it is pos:sible to represent all the pa tte rns of a group by a si ng le hex adecimal dig it .
Because the
lower gr oup has only 3 rows, the ran ge of all owab le digi ts for this group will be from
0 to 7. Of the two hexadeci ma l digits required to specify an ent ire c olum n. thic fi rst digit wi ll
represent the l ower group "nd t he second digit wi ll r epre s ent the u p ~ >e r gr oup.
The form of t he hexadecimal GPRINT is:
GPR
INT "hexadecima l- string ..
wher e:
hexadecimal-string is a string consisting of hex di gi ts. each pa ir spec ifyin9 the dot pattern of a
single co lumn.
Us in g th is for mat to create ou r Up Arr ow character from t he pr evious cxamp ~ c \vould give us
the statenlen
t:
(; PR IN T .. 04027F0 2 04"
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