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27_11_87/INFO
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » CEEFAX disks » telesoftware3.adl |
| Filename: | 27_11_87/INFO |
| Read OK: | ✔ |
| File size: | 28E7 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
Softscreen Text Editor - Instructions by Gavin Haines 25th March 1987
History
This package was originally written using an Acorn Electron, and the idea
was to provide a cheap RAM text editor for those who could not afford VIEW
etc. The programmer was a computer science graduate who undertook the
project as something to do while he was looking for employment. When the
package was nearly finished, he talked all about it to someone from a
local electronics firm who the n offered him a job.
Rather than let the whole thing go to waste, I decided to modify it for
use as an assembly language source file editor. It can also be used to
write letters etc., if you do do not have VIEW. However, the main idea is
to demonstrate how you can go about creating a large assembly language
program. It is is 6502 machine code throughout.
The idea of Softscreen is that you can enter and edit text without having
to worry about formatting. No matter how you insert, delete, or move
text, the screen is always kept completely up to date. Unlike VIEW, any
text deleted by accident can be recovered. The design philosophy has been
to keep it all extremely simple and easy to use.
The source code consists of a number of text files which can be assembled
in any order.
T.INSTR is this file.
T.SAMPLE is some sample text for testing out your printer etc.
I have assembled the following object files for the sake of convenience.
OBJ4B60 loads at &4B60 on the 32k BBC Micro
OBJE300 loads at &E300 on the 6502 Second Processor
OBJ8000 loads at &8000 on the BBC Micro (Paged RAM area)
All these versions are the same except in the size of text file which may
be loaded. (You can *RENAME this files to more more memorable
designations, such as EDITOR).
To use on the BBC Micro, you would type:
*OBJ4B60
It is forced into MODE 6 on a plain BBC Micro. MODE 7 is not used because
the Electron does not have it. You can use 80 columns on the other
systems with more memory.
To use on the 6502 Second Processor, you would type:
*OBJE300
With the Second Processor, it will start up in whatever MODE was
previously active. If the system is in MODE7, MODE6 will be selected.
This is so that you can use it on the Electron.
If your system has more than 32k, you can change MODE by going to the
Enter OS Command option and typing.
*FX255,251 (MODE3)
*FX255,254 (MODE6)
Then press the BREAK key. Changing MODE alters the amount of available
RAM on some systems, so any text in memory is cleared.
Entering Operating System (Star) Commands
You can enter any command that you could enter from BASIC, but do not
execute a command (such as *BASIC) that will take you out of Softscreen as
this will (obviously) lose any text that you happen to have in memory. To
exit to BASIC, select this option from the Main Menu. Obviously you
should not enter any command which could crash Softscreen. It is not
necessary to type the star * when entering system commands.
Typing CTRL-BREAK will get you out of Softscreen
Loading and saving of files from the Filer Menu is self-explanatory.
Saved files are automatically locked to prevent accidental deletion. To
use the same filename, unlock the file first.
IF you select the "Save workfile" option from the Editor menu, the system
will use the last used filename: You will get an error if no file has
been previously loaded, locked or unlocked.
You can use cassettes by selecting *TAPE
Cursor movement
Arrow keys move by character: up down left right
CTRL-T Top of page
CTRL-V Vertical - bottom of page
CTRL-S forwards one word
CTRL-A backwards one word
CTRL-S Start of Text
CTRL-E End of Text
CTRL-C Cut - define block
CTRL-C Cut - define end of block
CTRL-P Paste (having previously moved cursor below the block just
defined)
You cannot paste with the cursor above the block. To move text up, use
the DELETE and COPY keys.
CTRL-Z Zap delete the block
CTRL-O Overtype/insert toggle
CTRL-D Delete character in front of the cursor
The DELETE key deletes text behind the cursor
The COPY key undeletes
You can move words and lines by using the DELETE key, moving the cursor and then using the COPY key.
CTRL-L Deletes the end of the Line
CTRL-K (Kill) deletes the line back to the end of the previous line.
CTRL-Q deletes a word backwords
CTRL-W deletes a word forwards
CTRL-N allows you to insert control characters into the file.
Printout:
You can number lines of automatically by selecting this option from the
Printout menu. Line numbering will remain in effect until you cancel
it.
The printer package is set up for standard 66 lines fanfold or A4 cut
sheet.
It is advisable to test print before trying to get hard copy, in case you
have inadvertently loaded the wrong file.
If you need to stop sending text to the printer (for example to change the
ribbon), press the SPACE bar. Press the ESC key to abandon printing
altogether.
Technical Information.
(You need some knowledge of assembly language if you are going to
understand what follows - it is not intended for the novice).
The following files of source code exist:
T.START2 - sets up assembler variables
T.HEADER - ROM header code and error trapping
T.COMMON - Routines common to the whole package
T.CURSOR - Routines which deal with the cursor
T.SCREEN - Routines dealing with screen
T.TEXT - Shift text about in memory
T.EDITOR - Execute editor commands
T.FILER - load and save
T.PRINTER - hard copy options
T.MAIN - Menu options
To assemble the source using the Alan Phillips ADE compatible assembler,
you would type eg:
*ASSEMBLE T.START2 -OOBJ -W
The files can be assembled in any order
Memory usage:
Page zero: &70 -&8F
Page &900
Page &A00
Softscreen does not over write any areas used by BASIC. Softscreen
subroutines can therefore be called from BASIC.
Subroutines
Shiftb - Shift block of memory starting at address in "origin" and ending
with the byte whose address is given by XA -1. New start address of block
is in "dest", which must be below "origin".
origin = address of first byte in block
XY = address of last byte in block
offset = distance to move block
offset < 0 means shift down
offset > 0 means shift up
exits if offset =0 or origin <XY
local: dest, ptra, ptrb (zero page)
on exit: origin and offset unchanged. A,X,Y,C undefined.
In order that the execution time be as short as possible, indexed
addressing is used with bases addresses poked into the program during
execution (this subroutine must run in RAM).
The piece of code which does the actual shifting is arranged so that on
entry X contains the number of pages to be shifted (including any
incomplete page), and Y contains the two's complement of the number of
bytes in the complete page.
The code previous to this calculates X and Y and sets up the initial base
addresses.
Sheot - same as shiftb with XY automatically set to eot (end of text).
Update - update address table
Any addresses greater than origin have offset added to them.
table starts at cur
number of entries = tabsiz -1
on exit: origin and offset unchanged. A,X,Y,C undefined
Curpos - check if cursor inside block. On exit: C =1 if sob < cur =< eob.
On exit: A,X,Y undefined
Block - checks valid block. On exit: C set if either sob or eob is
undefined or if sob > eob. On exit: A,X,Y undefined
Room - checks enough room for text in section: on exit C set if eot +
offset < EOW. On exit: A,X,Y undefined
Getv - find in which line on the screen a certain position in the text
occurs.
enter with address in YA.
exits with line in X; Y unchanged; A, C undefined.
if X = &FF then below screen (in memory)
if X = bottom then above screen
local: temp
Getlin - find lenght of a line and address of start of next line
enter with address of line in ptr
if ptr > eot then len = 0
length of line returned in len
address of start of next line returned in YA
on exit: X,C undefined.
Putcsr - place cursor at point given by Y,X
on exit: X,Y unchanged, A,C, undefined.
Csrsol place cursor at start of line X
on exit Y = 0, X unchanged, A,C, undefined.
Prline Print a line, filling up to the end of line with spaces.
CR characters are converted.
Enter with: address of line in ptr
position of line on screen in vpos
length of line in len
On exit: vpos, ptr, len unchanged. A,X,Y,C undefined.
Scrolu - scroll screen up by one line - checks for eot
Scrold - scroll screen down by one line - checks for sot.
Text is maintained in memory as one long string. The cursor position
always corresponds to a character in text (hence at least always one
character in text). As much text is displayed on the screen without
splitting words across a line. The screen is always kept totally up to
date. As little of the screen is reprinted as possible.
Low level word processor routines.
dsable - osbyte called with X = 1, Y = 0
enable - osbyte called with X = 0, Y = 0
csron - switch cursor on
csroff - switch cursor off
wrch - write character, converting cr to back arrow
Operation of menu options.
Each string has a corresponding entry in a table of addresses. When you
select a particular option, it looks up the address of the subroutine in
the table, then the subroutine entry address (minus 1) is pushed onto the
stack, high order byte first. A 6502 RTS (Return from Subroutine) is used
to pop the address off the stack and into the 6502 program counter (after
incrementing by 1). When is an RTS not an RTS? Answer: when it is a JSR!
Filer options
When you call LOAD SAVE LOCK UNLOCK, it asks you for a filename which it
stored in oldstr. It sets up an OSFILE control block as documented in the
User Guides.
Converting this source code to BBC BASIC in-line assembler format:
Standard 6502 BBC BASIC
DFB 136 OPT FNEQUB (136)
DFB <label OPT FNEQUB (label-1) \high byte
label .label
STR"String" OPT FNS ("String")
label EQU &FFFF label = &FFFF
label >label2 .label OPT FNB(label2 MOD256)
LDY #<label LDY #label DIV 256 \high byte
LDA #>label LDA #label MOD 256 \low byte
label DS 2 label = FNW (2)
ORG &FFFF P%=&FFFF
DSECT W%=&900
ORG &900
DSEND
00000000 53 6f 66 74 73 63 72 65 65 6e 20 54 65 78 74 20 |Softscreen Text |
00000010 45 64 69 74 6f 72 20 2d 20 49 6e 73 74 72 75 63 |Editor - Instruc|
00000020 74 69 6f 6e 73 20 20 62 79 20 47 61 76 69 6e 20 |tions by Gavin |
00000030 48 61 69 6e 65 73 20 32 35 74 68 20 4d 61 72 63 |Haines 25th Marc|
00000040 68 20 31 39 38 37 0d 0d 48 69 73 74 6f 72 79 0d |h 1987..History.|
00000050 0d 54 68 69 73 20 70 61 63 6b 61 67 65 20 77 61 |.This package wa|
00000060 73 20 6f 72 69 67 69 6e 61 6c 6c 79 20 77 72 69 |s originally wri|
00000070 74 74 65 6e 20 75 73 69 6e 67 20 61 6e 20 41 63 |tten using an Ac|
00000080 6f 72 6e 20 45 6c 65 63 74 72 6f 6e 2c 20 61 6e |orn Electron, an|
00000090 64 20 74 68 65 20 69 64 65 61 0d 77 61 73 20 74 |d the idea.was t|
000000a0 6f 20 70 72 6f 76 69 64 65 20 61 20 63 68 65 61 |o provide a chea|
000000b0 70 20 52 41 4d 20 74 65 78 74 20 65 64 69 74 6f |p RAM text edito|
000000c0 72 20 66 6f 72 20 74 68 6f 73 65 20 77 68 6f 20 |r for those who |
000000d0 63 6f 75 6c 64 20 6e 6f 74 20 61 66 66 6f 72 64 |could not afford|
000000e0 20 56 49 45 57 0d 65 74 63 2e 20 54 68 65 20 70 | VIEW.etc. The p|
000000f0 72 6f 67 72 61 6d 6d 65 72 20 77 61 73 20 61 20 |rogrammer was a |
00000100 63 6f 6d 70 75 74 65 72 20 73 63 69 65 6e 63 65 |computer science|
00000110 20 67 72 61 64 75 61 74 65 20 77 68 6f 20 75 6e | graduate who un|
00000120 64 65 72 74 6f 6f 6b 20 74 68 65 0d 70 72 6f 6a |dertook the.proj|
00000130 65 63 74 20 61 73 20 73 6f 6d 65 74 68 69 6e 67 |ect as something|
00000140 20 74 6f 20 64 6f 20 77 68 69 6c 65 20 68 65 20 | to do while he |
00000150 77 61 73 20 6c 6f 6f 6b 69 6e 67 20 66 6f 72 20 |was looking for |
00000160 65 6d 70 6c 6f 79 6d 65 6e 74 2e 20 20 57 68 65 |employment. Whe|
00000170 6e 20 74 68 65 0d 70 61 63 6b 61 67 65 20 77 61 |n the.package wa|
00000180 73 20 6e 65 61 72 6c 79 20 66 69 6e 69 73 68 65 |s nearly finishe|
00000190 64 2c 20 68 65 20 74 61 6c 6b 65 64 20 61 6c 6c |d, he talked all|
000001a0 20 61 62 6f 75 74 20 69 74 20 74 6f 20 73 6f 6d | about it to som|
000001b0 65 6f 6e 65 20 66 72 6f 6d 20 61 0d 6c 6f 63 61 |eone from a.loca|
000001c0 6c 20 65 6c 65 63 74 72 6f 6e 69 63 73 20 66 69 |l electronics fi|
000001d0 72 6d 20 77 68 6f 20 74 68 65 20 6e 20 6f 66 66 |rm who the n off|
000001e0 65 72 65 64 20 68 69 6d 20 61 20 6a 6f 62 2e 0d |ered him a job..|
000001f0 0d 52 61 74 68 65 72 20 74 68 61 6e 20 6c 65 74 |.Rather than let|
00000200 20 74 68 65 20 77 68 6f 6c 65 20 74 68 69 6e 67 | the whole thing|
00000210 20 67 6f 20 74 6f 20 77 61 73 74 65 2c 20 49 20 | go to waste, I |
00000220 64 65 63 69 64 65 64 20 74 6f 20 6d 6f 64 69 66 |decided to modif|
00000230 79 20 69 74 20 66 6f 72 0d 75 73 65 20 61 73 20 |y it for.use as |
00000240 61 6e 20 61 73 73 65 6d 62 6c 79 20 6c 61 6e 67 |an assembly lang|
00000250 75 61 67 65 20 73 6f 75 72 63 65 20 66 69 6c 65 |uage source file|
00000260 20 65 64 69 74 6f 72 2e 20 20 49 74 20 63 61 6e | editor. It can|
00000270 20 61 6c 73 6f 20 62 65 20 75 73 65 64 20 74 6f | also be used to|
00000280 0d 77 72 69 74 65 20 6c 65 74 74 65 72 73 20 65 |.write letters e|
00000290 74 63 2e 2c 20 69 66 20 79 6f 75 20 64 6f 20 64 |tc., if you do d|
000002a0 6f 20 6e 6f 74 20 68 61 76 65 20 56 49 45 57 2e |o not have VIEW.|
000002b0 20 20 48 6f 77 65 76 65 72 2c 20 74 68 65 20 6d | However, the m|
000002c0 61 69 6e 20 69 64 65 61 20 69 73 0d 74 6f 20 64 |ain idea is.to d|
000002d0 65 6d 6f 6e 73 74 72 61 74 65 20 68 6f 77 20 79 |emonstrate how y|
000002e0 6f 75 20 63 61 6e 20 67 6f 20 61 62 6f 75 74 20 |ou can go about |
000002f0 63 72 65 61 74 69 6e 67 20 61 20 6c 61 72 67 65 |creating a large|
00000300 20 61 73 73 65 6d 62 6c 79 20 6c 61 6e 67 75 61 | assembly langua|
00000310 67 65 0d 70 72 6f 67 72 61 6d 2e 20 20 49 74 20 |ge.program. It |
00000320 69 73 20 69 73 20 36 35 30 32 20 6d 61 63 68 69 |is is 6502 machi|
00000330 6e 65 20 63 6f 64 65 20 74 68 72 6f 75 67 68 6f |ne code througho|
00000340 75 74 2e 0d 0d 54 68 65 20 69 64 65 61 20 6f 66 |ut...The idea of|
00000350 20 53 6f 66 74 73 63 72 65 65 6e 20 69 73 20 74 | Softscreen is t|
00000360 68 61 74 20 79 6f 75 20 63 61 6e 20 65 6e 74 65 |hat you can ente|
00000370 72 20 61 6e 64 20 65 64 69 74 20 74 65 78 74 20 |r and edit text |
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000003b0 74 74 65 72 20 68 6f 77 20 79 6f 75 20 69 6e 73 |tter how you ins|
000003c0 65 72 74 2c 20 64 65 6c 65 74 65 2c 20 6f 72 20 |ert, delete, or |
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00000420 78 74 20 64 65 6c 65 74 65 64 20 62 79 20 61 63 |xt deleted by ac|
00000430 63 69 64 65 6e 74 20 63 61 6e 20 62 65 20 72 65 |cident can be re|
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00000450 73 69 67 6e 20 70 68 69 6c 6f 73 6f 70 68 79 20 |sign philosophy |
00000460 68 61 73 20 62 65 65 6e 0d 74 6f 20 6b 65 65 70 |has been.to keep|
00000470 20 69 74 20 61 6c 6c 20 65 78 74 72 65 6d 65 6c | it all extremel|
00000480 79 20 73 69 6d 70 6c 65 20 61 6e 64 20 65 61 73 |y simple and eas|
00000490 79 20 74 6f 20 75 73 65 2e 0d 0d 54 68 65 20 73 |y to use...The s|
000004a0 6f 75 72 63 65 20 63 6f 64 65 20 63 6f 6e 73 69 |ource code consi|
000004b0 73 74 73 20 6f 66 20 61 20 6e 75 6d 62 65 72 20 |sts of a number |
000004c0 6f 66 20 74 65 78 74 20 66 69 6c 65 73 20 77 68 |of text files wh|
000004d0 69 63 68 20 63 61 6e 20 62 65 20 61 73 73 65 6d |ich can be assem|
000004e0 62 6c 65 64 0d 69 6e 20 61 6e 79 20 6f 72 64 65 |bled.in any orde|
000004f0 72 2e 0d 0d 54 2e 49 4e 53 54 52 20 69 73 20 74 |r...T.INSTR is t|
00000500 68 69 73 20 66 69 6c 65 2e 0d 54 2e 53 41 4d 50 |his file..T.SAMP|
00000510 4c 45 20 69 73 20 73 6f 6d 65 20 73 61 6d 70 6c |LE is some sampl|
00000520 65 20 74 65 78 74 20 66 6f 72 20 74 65 73 74 69 |e text for testi|
00000530 6e 67 20 6f 75 74 20 79 6f 75 72 20 70 72 69 6e |ng out your prin|
00000540 74 65 72 20 65 74 63 2e 0d 0d 49 20 68 61 76 65 |ter etc...I have|
00000550 20 61 73 73 65 6d 62 6c 65 64 20 74 68 65 20 66 | assembled the f|
00000560 6f 6c 6c 6f 77 69 6e 67 20 6f 62 6a 65 63 74 20 |ollowing object |
00000570 66 69 6c 65 73 20 66 6f 72 20 74 68 65 20 73 61 |files for the sa|
00000580 6b 65 20 6f 66 20 63 6f 6e 76 65 6e 69 65 6e 63 |ke of convenienc|
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000005a0 6c 6f 61 64 73 20 61 74 20 26 34 42 36 30 20 6f |loads at &4B60 o|
000005b0 6e 20 74 68 65 20 33 32 6b 20 42 42 43 20 4d 69 |n the 32k BBC Mi|
000005c0 63 72 6f 0d 4f 42 4a 45 33 30 30 20 20 20 20 20 |cro.OBJE300 |
000005d0 6c 6f 61 64 73 20 61 74 20 26 45 33 30 30 20 6f |loads at &E300 o|
000005e0 6e 20 74 68 65 20 36 35 30 32 20 53 65 63 6f 6e |n the 6502 Secon|
000005f0 64 20 50 72 6f 63 65 73 73 6f 72 0d 4f 42 4a 38 |d Processor.OBJ8|
00000600 30 30 30 20 20 20 20 20 6c 6f 61 64 73 20 61 74 |000 loads at|
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00000620 43 20 4d 69 63 72 6f 20 28 50 61 67 65 64 20 52 |C Micro (Paged R|
00000630 41 4d 20 61 72 65 61 29 0d 0d 41 6c 6c 20 74 68 |AM area)..All th|
00000640 65 73 65 20 76 65 72 73 69 6f 6e 73 20 61 72 65 |ese versions are|
00000650 20 74 68 65 20 73 61 6d 65 20 65 78 63 65 70 74 | the same except|
00000660 20 69 6e 20 74 68 65 20 73 69 7a 65 20 6f 66 20 | in the size of |
00000670 74 65 78 74 20 66 69 6c 65 20 77 68 69 63 68 20 |text file which |
00000680 6d 61 79 0d 62 65 20 6c 6f 61 64 65 64 2e 20 20 |may.be loaded. |
00000690 28 59 6f 75 20 63 61 6e 20 2a 52 45 4e 41 4d 45 |(You can *RENAME|
000006a0 20 74 68 69 73 20 66 69 6c 65 73 20 74 6f 20 6d | this files to m|
000006b0 6f 72 65 20 6d 6f 72 65 20 6d 65 6d 6f 72 61 62 |ore more memorab|
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000006e0 2e 0d 0d 54 6f 20 75 73 65 20 6f 6e 20 74 68 65 |...To use on the|
000006f0 20 42 42 43 20 4d 69 63 72 6f 2c 20 79 6f 75 20 | BBC Micro, you |
00000700 77 6f 75 6c 64 20 74 79 70 65 3a 20 0d 0d 2a 4f |would type: ..*O|
00000710 42 4a 34 42 36 30 0d 0d 49 74 20 69 73 20 66 6f |BJ4B60..It is fo|
00000720 72 63 65 64 20 69 6e 74 6f 20 4d 4f 44 45 20 36 |rced into MODE 6|
00000730 20 6f 6e 20 61 20 70 6c 61 69 6e 20 42 42 43 20 | on a plain BBC |
00000740 4d 69 63 72 6f 2e 20 20 4d 4f 44 45 20 37 20 69 |Micro. MODE 7 i|
00000750 73 20 6e 6f 74 20 75 73 65 64 20 62 65 63 61 75 |s not used becau|
00000760 73 65 0d 74 68 65 20 45 6c 65 63 74 72 6f 6e 20 |se.the Electron |
00000770 64 6f 65 73 20 6e 6f 74 20 68 61 76 65 20 69 74 |does not have it|
00000780 2e 20 20 59 6f 75 20 63 61 6e 20 75 73 65 20 38 |. You can use 8|
00000790 30 20 63 6f 6c 75 6d 6e 73 20 6f 6e 20 74 68 65 |0 columns on the|
000007a0 20 6f 74 68 65 72 0d 73 79 73 74 65 6d 73 20 77 | other.systems w|
000007b0 69 74 68 20 6d 6f 72 65 20 6d 65 6d 6f 72 79 2e |ith more memory.|
000007c0 0d 0d 54 6f 20 75 73 65 20 6f 6e 20 74 68 65 20 |..To use on the |
000007d0 36 35 30 32 20 53 65 63 6f 6e 64 20 50 72 6f 63 |6502 Second Proc|
000007e0 65 73 73 6f 72 2c 20 79 6f 75 20 77 6f 75 6c 64 |essor, you would|
000007f0 20 74 79 70 65 3a 0d 0d 2a 4f 42 4a 45 33 30 30 | type:..*OBJE300|
00000800 0d 0d 57 69 74 68 20 74 68 65 20 53 65 63 6f 6e |..With the Secon|
00000810 64 20 50 72 6f 63 65 73 73 6f 72 2c 20 69 74 20 |d Processor, it |
00000820 77 69 6c 6c 20 73 74 61 72 74 20 75 70 20 69 6e |will start up in|
00000830 20 77 68 61 74 65 76 65 72 20 4d 4f 44 45 20 77 | whatever MODE w|
00000840 61 73 0d 70 72 65 76 69 6f 75 73 6c 79 20 61 63 |as.previously ac|
00000850 74 69 76 65 2e 20 20 49 66 20 74 68 65 20 73 79 |tive. If the sy|
00000860 73 74 65 6d 20 69 73 20 69 6e 20 4d 4f 44 45 37 |stem is in MODE7|
00000870 2c 20 4d 4f 44 45 36 20 77 69 6c 6c 20 62 65 20 |, MODE6 will be |
00000880 73 65 6c 65 63 74 65 64 2e 20 0d 54 68 69 73 20 |selected. .This |
00000890 69 73 20 73 6f 20 74 68 61 74 20 79 6f 75 20 63 |is so that you c|
000008a0 61 6e 20 75 73 65 20 69 74 20 6f 6e 20 74 68 65 |an use it on the|
000008b0 20 45 6c 65 63 74 72 6f 6e 2e 0d 0d 49 66 20 79 | Electron...If y|
000008c0 6f 75 72 20 73 79 73 74 65 6d 20 68 61 73 20 6d |our system has m|
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000008f0 45 20 62 79 20 67 6f 69 6e 67 20 74 6f 20 74 68 |E by going to th|
00000900 65 0d 45 6e 74 65 72 20 4f 53 20 43 6f 6d 6d 61 |e.Enter OS Comma|
00000910 6e 64 20 6f 70 74 69 6f 6e 20 61 6e 64 20 74 79 |nd option and ty|
00000920 70 69 6e 67 2e 0d 0d 2a 46 58 32 35 35 2c 32 35 |ping...*FX255,25|
00000930 31 20 20 20 28 4d 4f 44 45 33 29 0d 2a 46 58 32 |1 (MODE3).*FX2|
00000940 35 35 2c 32 35 34 20 20 20 28 4d 4f 44 45 36 29 |55,254 (MODE6)|
00000950 0d 0d 54 68 65 6e 20 70 72 65 73 73 20 74 68 65 |..Then press the|
00000960 20 42 52 45 41 4b 20 6b 65 79 2e 20 20 43 68 61 | BREAK key. Cha|
00000970 6e 67 69 6e 67 20 4d 4f 44 45 20 61 6c 74 65 72 |nging MODE alter|
00000980 73 20 74 68 65 20 61 6d 6f 75 6e 74 20 6f 66 20 |s the amount of |
00000990 61 76 61 69 6c 61 62 6c 65 0d 52 41 4d 20 6f 6e |available.RAM on|
000009a0 20 73 6f 6d 65 20 73 79 73 74 65 6d 73 2c 20 73 | some systems, s|
000009b0 6f 20 61 6e 79 20 74 65 78 74 20 69 6e 20 6d 65 |o any text in me|
000009c0 6d 6f 72 79 20 69 73 20 63 6c 65 61 72 65 64 2e |mory is cleared.|
000009d0 0d 0d 45 6e 74 65 72 69 6e 67 20 4f 70 65 72 61 |..Entering Opera|
000009e0 74 69 6e 67 20 53 79 73 74 65 6d 20 28 53 74 61 |ting System (Sta|
000009f0 72 29 20 43 6f 6d 6d 61 6e 64 73 0d 0d 59 6f 75 |r) Commands..You|
00000a00 20 63 61 6e 20 65 6e 74 65 72 20 61 6e 79 20 63 | can enter any c|
00000a10 6f 6d 6d 61 6e 64 20 74 68 61 74 20 79 6f 75 20 |ommand that you |
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