Commodore Computer 4023 Manual de usuario descargar pdf (Pagina 15)

(Liz Deal Printer tips continued from page 2)

lines/page. Channel 3 on the printer understands that. I haven’t

tried it but this should work:

open 4,4,3:print#3,chr$(90):close 4 — for 90 lines/page

How to page? print clear-the-screen to the printer just as you

open it. Either chr$(147) or, in quotes, the CLR character

(shifted CLR/HOME key):

open4,4:print#4,chr$(147):cmd4:Iist

print#4:close4

Lists a program, and skips over the perforations IF AND

ONLY IF you started with the print head positioned right under

the perforation.

Once paging is turned on, do not do any manual adjustments

- or you’ll confuse things. If some printing ends before a page

is over, push the red-light-button to move to the next page. (Don’t

do it if you haven’t defined paging - unless of course you NEED

to MOVE ALL the paper from this to the other side...)

Suppose you want to list a disk directory to the printer. No

problem. There are two ways: the old-fashioned way is to

ioad"$0",8 for directory in drive zero. The problem is that this

method destroys any program in memory so do it when you don’t

need a program. Now follow the load with the listing instruction:

open4,4:cmd4:Iist

print#4:close4

Few people realize that the B-machine is capable of printing

the directory on the printer WITHOUT having to LOAD it in.

First let’s see how to see the directory. The magic words are

DIRECTORY or CATALOG, they can be abbreviated ’cA’ or if

you prefer three letters to two, ’diR’. The full and complete

syntax would include drive number and unit (if you forget the

drive number, the wrong drive always fires up, right?):

catalog u9,dl,"optional pattern matching scheme"

But it’s perfectly all right to omit much of this stuff, catalog

dl or directory dO do just fine. So, to put it out on the printer,

we say:

open4,4:cmd4:directory

Hurray. You’d think Commodore would let us in on this

secret!

Liz’s hint for the day: Compact Disk Directory Listings:

Put computer in text mode (no graphics), then:

open4,4,7:print#4:close4 text mode

open4,4,6:print#4,chr$(24):close 4 9/16 inch

load"$0",8

open4,4"cmd4:list — now it all prints

print#4:close4 to kill CMD

It should be possible to ’page’ in the 9/16 inch mode, by

telling the 4023 that it’s page length is now 99:

yet.

open4,4,3:print#4,chr$(99):cIose 4 — but I’ve not tried it

8023p PRINTER TIPs hy John Branca

CBM 8023p printer format settings needed with Super

script II edit mode:

a.) Set condense:

RVSsal3

b.) Cancel" RVSsal4

c.) set Double strike RVSsal3:sal5

d.) Cancel RVSsal4:sal2

e.) Reset width when in width default mode; ESC shifted

CLR - when control line says "restart program?", answer "y".

When the screen appears, change width setting to the one

desired. 160 is about right for a full 8 1/2" line of condensed

mode.

f.) Cancel width setting: same as e. above except change

back to 80.

These are the program changes necessary for the "banner"

program when using CBM 8023p printer. If you use the

program "as is" you will have 2 blank spaces between each

line which produces an unsatisfactory looking letter - too long.

Correct the problem as follows:

a.) List line 4030, change print#2, chr$(24) to

print#2,chr$(9). Use (8) if you want a more solid letter.

b.) List line5005, change is the same as for line 4030.

(4023 continued from page 1)

there is something else wrong.

THE 4023 DIAGNOSTICS

This is a general descrip

tion of the routine run when

the 4023 is first turned on. The

first thing done is to turn the

LED (light) off. Then it pro

ceeds to check the zero page

ram. Each byte gets the values

0 through 255 stored in it and

is checked to see if the value

read is the same as the one

stored. If any of the bytes foil

the test, the printer flashes an

error code of one.

Upon passing the zero page

test the printer computes the

checksum of the ROM. If an

incorrect value is obtained, it

generates error 2.

If the checksum is right, it

then proceeds to check internal

timers. The timers that I num

bered one through four are

started. It waits until timer 1

has counted down to zero and

checks to see if timer two is

also at zero. This code seems

peculiar in that if timer one is

not working, the computer

will probably sit there forever

waiting for timer one, without

indicating an error.

If timer one works and

timer two doesn’t, error 3 is

generated. If timer two is in

sync with timer one but timer

three isn’t, error 4 is gener

ated. If timer three is in sync

with timer one but timer four

isn’t, error 5 is generated. Al

though this timer is not used

by the 4023, it is probably

checked because it is used on

some other printer and it’s op

erating system was re-used so

a new one need not be written

from scratch.

At this point, the diagnos

tics are complete and the LED

is turned on. Then the printer

sets up house and gets ready to

print.

June 1993

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