Casio Cassiopeia IT-700 Manual de usuario descargar pdf (Pagina 4)

The Casio PB-700 can be used

to generate graphic displays

as this sine plot shows.

Casio PB-700

On the calculator side of the PB-700,

there is a very useful key, called ANS.

On pressing this key you obtain the

result or "answer" of the last calculation,

whether it was from program execution

or by manual means. So even if you

forget to jot the last answer down it can

always be retrieved until a new

calculation is carried out.

An interesting application of ANS is

when you want to run a long program

which only returns one answer of

interest. You simply run the program

and leave the PB-700 indefinitely. Once

8 minutes have elapsed from the time the

program finishes, the PB-700 will switch

off automatically. On returning to the

PB-700, you just need to press the ON

button followed by the ANS button and

the desired result will be displayed.

Graphics

The PB-700 has a quite extensive

graphics capability. In the graphics

mode, the liquid crystal display is

accessed by the CPU on a dot-for-dot

basis, 32 x 160 or 5120 dots in all.

Two commands are available for using

individual dots in drawing curves,

DRAW/DRAWC and POINT. This is

opposed to positioning the cursor by the

command LOCATE in order to write

characters where required.

The DRAW command is used in the

following way. DRAW (x 1, y l) simply

draws one dot located at x 1 dots across

and y 1 dots down from the top left hand

dot located at (0, 0). To draw a line from

(xl, yl) to (x2, y2) the command DRAW

(xl, yl) — (x2, y2) is used. The DRAWC

command works in exactly the same way

except it erases rather than draws.

The command POINT on the other

hand is used to determine whether a

particular point is turned on or off. This

command is used in the same way as the

DRAW command; POINT (xl, yl).

From the program listing for the sine

wave, you can see that the DRAW

function is quite simple to use. The

DRAW (X, Y) statement actually does

the drawing of the sine wave; DRAW

(A, 2) — (A, 28) is used for the vertical

axis and DRAW (A, B) — (A + 150, B) is

used for the horizontal axis.

The version of Basic used by the

PB-700 has the v ability to trace

programs. This feature is generally used

for debugging. To start a program trace

the command TRON is used while to

end the trace sequence the command

TROFF is used. Since TRON, TROFF

are program commands, they can be

used in programs but they are usually

used by direct entry.

To obtain an appreciation of the speed

of the PB-700 the following program was

run.

10 FOR Y = 1 TO 1000

20 NEXT Y.

This simple program puts the unit into

a loop which it repeats until Y = 1000.

Execution of this program by the

PB-700 took approximately 12 seconds,

or in other words each loop took 12

milliseconds to execute. The same

program run on a TRS-80 was found to

execute in 2.7 seconds.

So the PB-700 is not fast.

Accessories

As already mentioned, add on RAM

packs are available for the PB-700. These

This short listing can be used to generate

the sine plot depicted above.

RAM packs fit into a compartment on

the back of the PB-700.

The most powerful accessory for the

PB-700 is the combined printer plotter

and microcassette interface. This clips

onto the PB-700 and prints in four

colours on 114mm wide paper. A

separate microcassette recorder is also

available and this plugs into the cassette

interface port on the PB-700.

Conclusion

While the PB-700 is a useful machine,

it is fairly slow. For many applications, a

scientific calculator would be cheaper

and much faster. However, for

applications requiring long and

complicated calculations the PB-700

could well come into its own for ease of

data entry and retention of final results.

Prices of the PB-700 and its

accessories are as follows. The PB-700

itself retails for $299. The FA-10 printer-

plotter is priced at $399 while the CM-1

micro-cassette recorder is $69. The 4K

RAM packs sell for $69.

The Casio PB-700 is distributed in

Australia by Mobex Pty Ltd, 76

Parramatta Rd, Camperdown, NSW

2050. Phone (02) 516 4055.

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ELECTRONICS Australia, November, 1984

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Casio Cassiopeia IT-700 Manual de usuario Pagina 4

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