Sharp PC-1500 - LH5810 I;O Port Pin Assignments and Descriptions

A ll and more about Sharp PC-1500 at http://www.PC-1500.info
VJa tc h c lo se 'ly as pairs of n umbe rs appear br i ef ly on the screen. The second number in the pair
(on the right) will be the sq uare of t he first. Eight pairs of numbers will be displayed because
th at is what yo u asked for when you responded to the program's question.
When the pr ompt retu rns. re·run the program (type RUN, press l •• ••• I I and ma ke a different
response to the "L IST SIZE? '' quest ion. Run the program several times experimenting with
differ
ent li st s.izes. You are experien cing one of the im por tant adva nta ges of programmab le
compu ters; they can perform a t ed ious task repe atedly , varying it sligh tly eac h time in r espons e
to the in put .
Re·run the program once more b ut th is tim e e nt er a zero for the list si ze . What happens?
Yes, the prog ram ends wit hout havi ng pr oduced a list. Although this may seem odd, the PC · 1500
is si mply follow ing ou r i nstruct ions.
This i llustrates why the computer is such a po .. verful tool. It ca r'' be prC>grammed to fo ll o .. v
different sets of in struc tions and process th e variety of infor mation it is given. Because of the
i
nstructions in li ne 20, if the user's in put is ze ro (or less) the co m puter skips: over t he computa·
tiQn Qf the li it ~ n d 99e1 t9 t he end Qf the pr99 ram, In e ff ect, it hai made a dec ision based on the
us er 's request. As a programmer, you contro l wh at decisions are po ssible and w h en th ey are made .
Thu s, th e full powe r of the comP<J tcr is available to you to so lve you r speci fic pro blem in the
manner you think is best.
I. GETTING ACQUAINTED
After you l!lnpack yo ur Sharp Pocket Compu ter (hereafter we'll call it SHARP) and ad mi re
yo ur h ands o me new friend, you might wonder 1,vhat yo u're star ing at. Le t's exam ine SHARP :
n e servab le
k1:ys
Batte ry f unct i Qn indiC3tor
eioooe:Jo
El a -.111aa111•1111mW _ Cil0
Sh ift k~y
On· Off keys
1-- +- - Clcar k ey
••••• Ill • • • (!] [fil [[) [iJ ~-+ -Mode ~cv
aamaamlllillil l!JIII ~ 88
~ CTJ 51 - ~!fl I 'j'u I llJ (;) _ :_ lti _ lfl
L s man k ey E1 ltty key
N ume ric keys
A l phab e tic keys
We will d es cribe the display in a mome nt. First. even before you tu rn on SHARP, noti ce
several impo rta nt features of t he keyboa r d:
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