Printer User's Manual

I
Nowwewill calculatethevertical numerical valuesofthecolumnsofdots,
andenterthemunderneaththegrid.Eachverticalcolumnisfirstdivided
into
threegroupsof eightdots.Eachgroupof eightdots is representedby one
byte,whichconsistsof eightbits.
This
iswherethenumbersdowntheleftsideofthegridcome in. Noticethat
thereis a numberfor each row of dots and that each numberis twicethe
numberbelow
it. Bymakingthesenumberspowersoftwo we can takeany
combinationof dotsin
a verticalcolumnandassignthem a uniquevalue.
Assigning the Index Table data
Unlikedefiningin the Standardmode,youmustassigntheIndexTablewith
the IBM mode.This IndexTable is preparedfor the informationof each
charactersattributedata,such
ascharactertype(Normal24-dothigh,or30-
dot high block graphics),the dot pattern data
in thememory, and the
compressionmaskbit data.
Eachcharacterrequires9 indextabledata.
Thefirstandthesecondbytes(ml andTn2)indicatesthepositionofthefirst
dotpattern
inthememory.ml isthehighorderbyte,andrn2istheloworder
byte.
Thethirdbyte,m-?,indicatesthecharacter
type andthedotpatterndatawidth
in the memory.
If the ch~acter
isnormal,simply enter the width of dot pattern inthe
memory.If the characteris a block graphic,add 128to the widthof dot
patternin the memory.
Ourtelephonesymbolis
anormalcharacterandthewidthofthedotpattern
in thememoryshouldbe 25, so this
value is 25.
The fourthbyte,m4,indicatestheprintingattribute.
Thisbyteindicatesthecharacterwidthto beprinted,andinformationofthe
repetitiondotsfor blockgraphics“characters.
If the character
isa normalcharacter,add 192to the characterwidth.
If thecharacter
isablockcharacter,andit shouldbeprintedasa linedraw
character,add64
to the characterwidth.If the blockcharacteris not a line
drawcharacter,thisbyteshouldbe the sameasthe characterwidth.
Ourtelephonesymbol
isanormalpicacharacter,sothe characterwidthis
35,andthisbyteshouldbe 227.
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