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29-10-88/E\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 » telesoftware10.adl |
| Filename: | 29-10-88/E\INFO |
| Read OK: | ✔ |
| File size: | 5AC5 bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
Duplicates
There is 1 duplicate copy of this file in the archive:
- CEEFAX disks » telesoftware10.adl » 29-10-88/E\INFO
- CEEFAX disks » telesoftware6.adl » 09-04-88/E\INFO
File contents
Eclipse Documentation
Eclipse requires 16K of sideways RAM in which to run. It cannot be
blown into ROM since it is by it's very nature a RAM only program. It has
been designed to provide easy access to sideways RAM which is normally
"hidden" from the user. To do this it divides the 16K into two areas of
8K, one for the actual program code and the other for the user. This
second 8k provides 32 "membanks" of 256 byes each.
Membanks can be used in several diiferent ways, e.g. they can be used
to keep notes and messages in, the first 10 membanks can be used as extra
function keys each of 256 bytes each instead of just 256 bytes between 10,
pages of main RAM can be swapped in and out of SWR (page 12 holds the User
Defined Graphic Characters, several alternative UDG set could be held in
various membanks and swapped in to replace page 12 when the user wished
thereby extending the number of UDGs available), last but not least the
banks can be used to hold macros.
Eclipse Macros are simply a series of operation system * commands
which Eclipse forces the operating system to execute when the user
executes the macro. So that these can be fully supported Eclipse provides
several control stuctures, links to machine code, input/output commands,
and allows other commands either on disc or in other ROMs to be inculuded
in a macro.
Eclipse's facilities can be divided into two main groups; minor
utilities and membanks. Eclipse has been designed to work from within any
language on the BBC micro and uses no calls to BASIC. (The exception to
this is the Baslist command which lists BASIC programs from discs).
Eclipse should work with all filing systems but has only been tested
with discs.
Eclipse is compatible with a Model B+, but a *CLEAN is required before
you start work. This is because on the B+, like some SWR boards for the B,
sets all locations initially to zero, causing Eclipse to think it has a
full complement of macros loaded. Eclipse has not been tested on a Master,
but there is no reason why it should not operate correctly.
Eclipse can perform many operations, to some users some of these
options may well be inappropriate, and it is therefore designed for
individual users to "tailor" it to there own uses. One good example of
this is the *BREAK command. The ability to add extra messages may seem
trivial but it is more important in that this provides an entry point for
interceping the OS after a break. Because Eclipse uses so much memory
users will either have to use fewer membanks or strip some functions out.
For details of entering Eclipse see the Technical section below.
Before continuing, several points must be noted. Firstly, some of the
commands mainly those intended for general use, print "OK" when they have
finished, I myself find this convenient but the facility can be turned of
with *NOOK and switched back on with *OK. The commands which are mainly
intended to be used from within membanks do not print "OK" at all to avoid
corruption of the screen.
Second, Eclipse operates entirely in hexadecimal. This reflects it's
closeness to machine code/assembly language. The only execption to this is
the SCREEN command (see below).
Finally, since Eclipse contains over 70 commands, it is quite possible
that one of Eclipse's commands may be recognized by another sideways
ROM/RAM and executed by mistake. To avoid this all Eclipse commands may be
prefixed by "P". Eclipse commands may be in either upper or lower case,
e.g. *PBASLIST, *baslist, & *pBaSlIsT perform the same task as *BASLIST.
General Commands.
1) *BREAK. This command is very important since several other commands
rely on it's setting. *Break should always be followed by a hexadecimal
value and sometimes a string of ASCII characters. The first four bits of
this value signify the following:
a) If bit 0 is set the "BBC Computer" message will not appear.
b) If bit 1 is set the string following *Break will be displayed on
each break. The string may be up to 40 characters.
c) If bit 2 is set then Eclipse will take control of the operating
system character output stream vector (WRCHV) allowing various changes to
the characters output to be made (see below).
d) If bit 3 is set then Eclipse will take control of the operating
system event vector (EVENTV) allowing the extended function keys to
operate.
Examples:
*BREAK F Eclipse Sideways RAM - this will cause Eclipse to take
control of WRCHV vector and EVENTV vector and display Eclipse Sideways RAM
above the BBC Computer message
*BREAK 1 - this will just remove the BBC Computer mesages.
*BREAK C - this will leave the messages as normal but will claim both
WRCHV and EVENTV.
2) *Upper, *Lower and *Normal
If *Break has not claimed the WRCHV vector then these commands may not
be used.
*UPPER causes all lower case characters sent to the screen and printer
to be made into upper case characters.
*LOWER operates the same as *Upper but coverts all upper case
characters to lower case characters.
*NORMAL cancels the action of *Upper and *Lower
3) *Return and *Noreturn
Again the WRCHV vector has to be claimed. *RETURN {number} censures
the characters sent to the screen and if a character with the same ASCII
value as {number} is sent output is halted until the user presses the
RETURN key. *NORETURN cancels this action.
e.g. *RETURN D - means that the return key must be pressed before every
line feed
4) *Beep and *Nobeep
Again the WRCHV vector must be claimed. *BEEP x y slows down output to
the screen by causing a beep though the internal speaker of the same pitch
as the character sent to the screen. With Beep x and y are needed for
duration of beep (x) and amplitude (y). These are the same as for the BBC
BASIC sound command but the amplitude is positive not negative and
envelopes cannot be used, e.g. *BEEP 1 7. *NOBEEP cancels this action.
5) *Text, *Graphic and *Window
Within Eclipse space has been alloted to hold the settings for 16
windows which would normally have to be set with the VDU 23 and VDU 28
commands. The first 8 windows (0 to 7) are for text windows and the second
8, 8 to &F for graphic windows. *Text or *Graphic are used to set the
window's pararmeters and *Window to activate them
e.g.
*Text 0 5 10 D 1
*Window 0
*Graphic 8 96 12C 448 2BC
*Window 8
6) *Baslist
This is the only command requiring the BASIC ROM. *Baslist {filename}
will find the file specified and list it on screen as if it were in memory
and were being LISTed.
One advantage of this command is in recovering a "Bad program". Since
the output can be spooled as usual, if a program becomes bad the area of
memory containing the program can be *SAVEd, a *SPOOL file opened and then
the memory file *Baslisted to produces a file which when executed is a
normal BASIC program,
e.g. *SAVE BADPROG 1900 +1000
*SPOOL PROG
*BASLIST BADPROG
(program is listed)
*SPOOL
NEW (prepare BASIC for a new program)
*EXEC PROG
This may not recover all the program (the amount recovered depends on
the damage done) but will usually recover most of the program.
7) *CHANGE and *NOCHANGE
These 2 commands require WRCHV to have been claimed with *BREAK.
*NOCHANGE will wipe all settings set by *CHANGE. Change needs 3
parameters, the first of which is the priority (0 to &D), next comes the
character to be changed then the character to be changed to
e.g. *CHANGE 1 C 40
This would cause the @ sign to be printed when ever VDU12 was issued.
The priority is important since there may be several attempts to change
one character, the first to it wins e.g. with the following settings:-
*CHANGE 0 C 40
*CHANGE 1 C 41
*CHANGE 2 C 42
VDU 12 would be changed to @ not A to B.
8) *SETTINGS and *STATUS
These simply display details of various settings e.g break, beep,
return, change and windows.
Macros
Macros are one of the major functions of Eclipse. Macros in Eclipse
are a collection of Operating System star (*) commands. This enables
Eclipse to access OS functions, functions in other ROMs which have command
access and programs on disc. Eclipse also provides a host of support for
these commands including; if then else, for next, repeat until, variables
etc. Eclipse can, in some ways, be thought of as a small language.
Macros are programmed in the same way as notes are taken, with the use
of the MEM command. To tell Eclipse that the membank contains a macro it
must start with a zero. Next must be the name of the command and finally a
carriage return or space to signal the end of the command, e.g. *MEM 00
|@EXAMPLE|M defines a new command in membank 00 called EXAMPLE, as yet it
does nothing. By typing *MACROS all the macros so far defined will be
listed. Suppose a command is needed to catalogue both sides of the disc at
the same time. Then
*MEM 00 |@BOTH|MCAT 0|MCAT 2|M
Notice that you need not insert the *. This also shows how commands
may be placed one after another by separating commands with a return. The
final |M is not strictly necessary since Eclipse automatically inserts one
when it comes to the end of the membank. Macros can be recalled in the
normal way with *RECALL. To use a macro simply type its name as a normal *
command e.g. *BOTH. To reduce clashes the macro's are case sensitive e.g.
*BOTH and *both are different commands.
An alternative way to use macros is without a command. The macro is
defined as normal but the zero, name, and return code is left out. To run
the macro the command *MACRO x is used where x is the number of the
membank containing the membank. Do not confuse this command with *MACROS
which looks for a zero at the start of a membank and if it finds one
displays the name. Macros defined in this alternative way will not show up
on a *MACROS call. Using this method the above dual catalogue would be
written thus:
*MEM 00 .0|M.2|M
To use it *MACRO 00 would be used. (The use of *. as apposed to *CAT is
irrelevant.)
Variables
Eclipse supports variables both inside and outside macros although
other ROMs and * commands will not recognize Eclipse's variables, unless
they have been programmed to do so. There are just 26 variables, A to Z
(upper case only ). So that Eclipse knows that, what it expects to be a
number is actually a variable. It is preceeded with a percent sign (%). To
set a variable the command *LET is used e.g. *LET %T=77. To see the value
of a variable *SCREEN can be used e.g. *SCREEN %T. All Eclipse commands
will accept variables instead of a number.
If a variable or value is prefixed by ?, as in BASIC the effect will
be like a PEEK command, substituting the returned value for the value of
the memory location of the following value e.g. *LET %T=?FFFF or *LET
%T=?%U. By using 2 question marks an indirect operator can be simulated
e.g. LET %T ??&C00 means the value at the memory pointed to by the value
of memory location &C00.
Initially all variables are set to zero. Variables are 16 bit, if an
Eclipse command only needs 8 bits only the lower 8 bits will be looked at.
Variables are one of the central points of the Eclipse macro system
allowing macros to more than just replace a series of keyboard commands.
Since Eclipse only uses memory within SWR macros can be used from within
most language ROMs. The only memory not in SWR that they use are a few
zero page locations which are allotted for transient disc commands.
To support variables there are a host of special * commands, they are
mainly based on BASIC commands since most users will be familiar with
these but some do have a similarity to Forth.
1) *LET x y. This uses 2 values, the first (x) must be a variable, the
second can be another variable or a number. The equals sign used above is
optional.
2) *ADD x y z. This will store in variable x the sum of y and z. y and
z may be variables and/or numbers e.g. *ADD %R %Y 6 or *ADD %W 9 9
3) *SUB x y z. This is the same as ADD but will subtract z from y and
store the result in x.
4) *AND x y z. This will perform a Boolean AND operation on y and z at
bit level and store the result in x.
5) *OR x y z. This is the same as AND but will perform a bit level
Boolean OR operation on y and z storing the result in x.
6) *EOR x y z. The same as OR but a Boolean bit level Exclusive OR
operation on y and z.
7) *NOT x. This will carry out a bit level Boolean NOT on x
effectively making it negative, if positive and vice versa.
8) *TEST x y [condition] z. This will test y against z wih the
condition specified and store a true (&FF) or false (0) result in x e.g.
*TEST %T %Y>0 or *TEST %T %U>=%I. The conditions that can be used are =,
>, <, <>, >=, or <=.
Although the variables can be used freely, 4 of them are special. %A,
%X, %Y and %P roughly correspond to the 6502 A, X, Y and PSR registers.
This means that when the direct links to machine code e.g. GO, MC, GOSUB,
OSWORD, OSBYTE etc. are used the values in %A, %Y, %X, and %P are copied
into the A, X, Y and PSR registers and where there is a return the
registers are copied into the variables. This enables machine code calls,
particularly OSBYTEs to be used and monitored.
Control Structures
Three control structures are implemented in a similar manner to their
BASIC equivalents, but there are slight differences.
1) If
The if structure uses 4 commands, *IF x [condition] y, *THEN
instructions, *ELSE instructions (optional statement), *ENDIF. A possible
example of this would be:
*MEM 01 |@EXAMPLE
IF %Y=6
THEN
SCREEN Y is equal to six
|@ELSE
SCREEN Y is not six
|@ENDIF
SCREEN OK?
[Note that this definition could not be entered like this. It would
need to be expressed as: *MEM 01 |@EXAMPLE|MIF %Y=6|MTHEN|MSCREEN Y is
equal to six|M|@ELSE|MSCREEN|MY is not six|M|@ENDIF|MSCREEN OK?|M]
Translated this means:
*MEM 01 - store the following im membank 1
|@EXAMPLE - this is a macro (|@ gives 0), it is called EXAMPLE and
ends with a carriage return (|M)
IF %Y=6 - this is one phrase. It is terminated by the carriage return
(|M). When Eclipse encounters an IF it evaluates the condition and stores
the result as a flag, the last flag set is consulted by THEN and ELSE and
only removed when ENDIF is found. (For the condition available see *TEST
above.)
THEN - if the last IF flag is false Eclipse will ignore all the
following instructions. It will look for the next zero in the membank
before executing any more instructions. If the IF flag is true Eclipse
will continue executing the following instructions as before
SCREEN Y is equal to six - this is just a message for screen display (
see below)
|@ - this tells Eclipse that the THEN instructions are finished so
revert to executing instructions regardless of the IF condition
ELSE - this is the reverse of the THEN statement. If the latest IF
flag is true Eclipse will skip the following instructions until it
encounters a zero.
|@ - this signals the end of the ELSE
ENDIF - this will remove the latest IF flag. Note that since Eclipse
works with an IF flag which is only removed when it is told to there are
several useful situations:
1) You can place non-conditional statements between the IF, THEN, ELSE
and ENDIFat any point as long as neither THEN or ELSE has been executed or
after the zero (|@).
2) You can place the THEN and ELSE in any order or have more than one
e.g. ELSE, THEN, ELSE, THEN, ELSE is possible.
3) If the membank is terminated before the ENDIF removes the flag it
will remain. This will normally be a disadvantage since after 16
unfinished IFs you will get a "Too many" error since Eclipse can only
handle 16 ifs at a time - this should be more than adequate. To clear any
unwanted flags use *ENDIF until a no start error occurs.
2) The For loop
The for loop uses the commands FOR and NEXT. It has a control variable
and an upper and lower limit. It also has an optional step control but if
none is specified it will use 1.
FOR takes the form FOR x y z t. Where x is the control variable, y the
lower limit and z the upper limit, t is the optional step, if the default
is to be used a carriage return should be placed after the z. y and z may
be numbers and/or variables.
NEXT simply increments the control variable by the step and continues
execution from the command after FOR, provided the upper limit has not
been reached.
*MEM 02 |@EXAMPLE2
FOR %T 0 10
SCREEN %T
NEXT
or
*MEM 02 |@EXAMPLE3
FOR %T 0 20 2
SCREEN %T
NEXT
Again FOR NEXT uses a series of flags and if the macro is terminated
prematurely by the exit from the membank the result will be to leave these
flags set. Eclipse can handle 8 indented FOR loops at one time. To clear
any spare loops simply use *NEXT directly.
3) The Repeat loop
This is implemented as in a similar way to the FOR NEXT and IF
structures. The above FOR NEXT macros can be written with this structure
as:
*MEM 02 |@EXAMPLE4
LET %T=0
REPEAT
SCREEN %T
ADD %T %T 1
UNTIL %T>10
or
*MEM 02 |@EXAMPLE5
LET %T=0
REPEAT
SCREEN %T
ADD %T %T 2
UNTIL %T>20
Again REPEAT UNTIL uses flags and the premature exit of a macro will
leave these flags set, to cure this use *UNTIL 1=1.
Memory manipulation
Apart from the commands already covered in the general section for
changing pages of memory there are two more commands. These are *BYTE and
*WORD. *BYTE x y will store the lower 8 bits of y in memory location x.
*WORD x y will store the 16 bits of y in x and x+1 corresponding to the
upper and lower bytes.
Operating System routines and machine code
Eclipse allows users to incorporate machine code, where necessary,
this may be either calls to specialist Operating System calls or the users
own machine code. To allow for this Eclipse provides nine commands. These
used together with the %A, %X, %Y and %P relationships (above) allows most
machine code functions to be easily accessed.
First the OS commands. Before using these %A, %X and %Y will have to
be set and in some cases a control block established in memory. P% has
little effect so this is only set on return, the PSR is not changed on
entry. Any block of memory used will normally be in main RAM but could be
in one of Eclipses membanks although this may cause problems if other ROMs
or the OS is accessed. The memory may be set up from outside Eclipse or
with the use of Eclipse's STORE, RESTORE, BYTE, and WORD commands.
Once the conditions have been set (refer to the BBC User Guide or any
other book documenting OS calls e.g. BBC Advanced User Guide). Simply use
one of the following commands: OSBYTE, OSCLI, OSWRCH, OSASCI, ORWRCH or
OSWORD. This is by no means a comprehensive list of all OS calls, these
are just the most frequently used commands; so Eclipse supports them,
there would be little point in including many rarely used commands which
may not be used very often. Any command not listed can still be
synthesized using the GOSUB command. The filing system commands have to be
left out because although they are very useful they are probably better
left to a full blown language - although GOSUB can be used.
The GOSUB x command will jump to location x and execute the machine
code there. %A, %X and %Y are copied to the registers before leaving.
Since Eclipse expects a return the registers will be copied back to %A,
%X, %Y and %P on return.
The GO x command is the same as the GOSUB command but Eclipse does NOT
expect a return. This means that when the routine is left control will be
return to the OPERATING SYSTEM. The OS is ignorant of any action that may
have been taken by Eclipse since it passed the * command to Eclipse it is
important therefore, that the machine code run exits with A=0, if it does
not then the OS will continue to process the command if A=4, if A is set
to another value results will be slightly unpredictable.
The MC command is different from all other Eclipse commands since it
is intended to bring together directly, machine code intended for Eclipse
into Eclipse. MC should ONLY be used within a macro. Its effect is to take
the current memory pointers from Eclipse, set %A, %X and %Y and hand
control over to machine code that follows the MC command e.g. the inside
of the membank would be something along the lines of 0,E,G,13,M,C,13 [pure
machine code]. The machine code will, of course, have to be calibrated to
run in the membank unless it only uses relative addressing. Eclipse does
not expect a return from this command so the same exit conditions exist as
with GO.
Input and Output within Macros
When a normal * command is entered it may be followed by paramenters,
Eclipse macros may also be followed by paramenters. This is accomplished
through the GET and STRING commands.
GET x - this takes a number following the Macro and stores it in
variable x. e.g GET %T within the macro EXAMPLE would take the 20 from the
command *EXAMPLE 20 and store it in %T.
STRING x - here the string of characters following the command are
taken and strored at location x. e.g. STRING C00 in macro "EXAMPLE this is
text" - would store "this is text" at location &C00 on.
It is advised that if STRING and GET are to be used they are used
early on in the macro e.g. first or second command executed. GET can be
reused e.g. GET %T GET %U but once STRING has been used neither it or GET
can be used again.
The command SCREEN has appeared above on several ocasions. All
*SCREEN does is display the following message on the screen. If % occures
SCREEN will take the following letter and handle it as a variable
displaying its hexadecimal value on screen. If ~ is used the SCREEN will
take the following value, numeric or variable and display it in decimal.
If ^ is found SCREEN will display the following value, again numeric or
variable, as an ASCII code.
The command INSERT x will insert into the keyboard buffer the string
of characters x e.g INSERT This is the Insert command.
Since SCREEN and INSERT are both intended to be used from within
macros any | characters included during their entry will be left so if
used directly the | character will show up as |x. The only exception which
may cause problems is |@ (0) as Eclipse uses this when dealing with IF,
THEN, ELSE, ENDIF.
Since SCREEN must be used within a membank long messages may cause
problems, one way round this is to install the message(s) in a membank(s)
and RECALL the membank(s) needed.
The final input command is INKEY x y. This is the same as the BASIC
inkey. x is the length of time in hundreths of a second to be waited and
the ASCII value of the key pressed (if at all) is stored in y. e.g. INKEY
20 %T.
00000000 20 20 20 20 20 20 20 20 20 20 20 20 45 63 6c 69 | Ecli|
00000010 70 73 65 20 44 6f 63 75 6d 65 6e 74 61 74 69 6f |pse Documentatio|
00000020 6e 0d 20 20 20 20 20 45 63 6c 69 70 73 65 20 72 |n. Eclipse r|
00000030 65 71 75 69 72 65 73 20 31 36 4b 20 6f 66 20 73 |equires 16K of s|
00000040 69 64 65 77 61 79 73 20 52 41 4d 20 69 6e 20 77 |ideways RAM in w|
00000050 68 69 63 68 20 74 6f 20 72 75 6e 2e 20 49 74 20 |hich to run. It |
00000060 63 61 6e 6e 6f 74 20 62 65 0d 62 6c 6f 77 6e 20 |cannot be.blown |
00000070 69 6e 74 6f 20 52 4f 4d 20 73 69 6e 63 65 20 69 |into ROM since i|
00000080 74 20 69 73 20 62 79 20 69 74 27 73 20 76 65 72 |t is by it's ver|
00000090 79 20 6e 61 74 75 72 65 20 61 20 52 41 4d 20 6f |y nature a RAM o|
000000a0 6e 6c 79 20 70 72 6f 67 72 61 6d 2e 20 49 74 20 |nly program. It |
000000b0 68 61 73 0d 62 65 65 6e 20 64 65 73 69 67 6e 65 |has.been designe|
000000c0 64 20 74 6f 20 70 72 6f 76 69 64 65 20 65 61 73 |d to provide eas|
000000d0 79 20 61 63 63 65 73 73 20 74 6f 20 73 69 64 65 |y access to side|
000000e0 77 61 79 73 20 52 41 4d 20 77 68 69 63 68 20 69 |ways RAM which i|
000000f0 73 20 6e 6f 72 6d 61 6c 6c 79 0d 22 68 69 64 64 |s normally."hidd|
00000100 65 6e 22 20 66 72 6f 6d 20 74 68 65 20 75 73 65 |en" from the use|
00000110 72 2e 20 54 6f 20 64 6f 20 74 68 69 73 20 69 74 |r. To do this it|
00000120 20 64 69 76 69 64 65 73 20 74 68 65 20 31 36 4b | divides the 16K|
00000130 20 69 6e 74 6f 20 74 77 6f 20 61 72 65 61 73 20 | into two areas |
00000140 6f 66 0d 38 4b 2c 20 6f 6e 65 20 66 6f 72 20 74 |of.8K, one for t|
00000150 68 65 20 61 63 74 75 61 6c 20 70 72 6f 67 72 61 |he actual progra|
00000160 6d 20 63 6f 64 65 20 61 6e 64 20 74 68 65 20 6f |m code and the o|
00000170 74 68 65 72 20 66 6f 72 20 74 68 65 20 75 73 65 |ther for the use|
00000180 72 2e 20 54 68 69 73 0d 73 65 63 6f 6e 64 20 38 |r. This.second 8|
00000190 6b 20 70 72 6f 76 69 64 65 73 20 33 32 20 22 6d |k provides 32 "m|
000001a0 65 6d 62 61 6e 6b 73 22 20 6f 66 20 32 35 36 20 |embanks" of 256 |
000001b0 62 79 65 73 20 65 61 63 68 2e 0d 20 20 20 20 4d |byes each.. M|
000001c0 65 6d 62 61 6e 6b 73 20 63 61 6e 20 62 65 20 75 |embanks can be u|
000001d0 73 65 64 20 69 6e 20 73 65 76 65 72 61 6c 20 64 |sed in several d|
000001e0 69 69 66 65 72 65 6e 74 20 77 61 79 73 2c 20 65 |iiferent ways, e|
000001f0 2e 67 2e 20 74 68 65 79 20 63 61 6e 20 62 65 20 |.g. they can be |
00000200 75 73 65 64 0d 74 6f 20 6b 65 65 70 20 6e 6f 74 |used.to keep not|
00000210 65 73 20 61 6e 64 20 6d 65 73 73 61 67 65 73 20 |es and messages |
00000220 69 6e 2c 20 74 68 65 20 66 69 72 73 74 20 31 30 |in, the first 10|
00000230 20 6d 65 6d 62 61 6e 6b 73 20 63 61 6e 20 62 65 | membanks can be|
00000240 20 75 73 65 64 20 61 73 20 65 78 74 72 61 0d 66 | used as extra.f|
00000250 75 6e 63 74 69 6f 6e 20 6b 65 79 73 20 65 61 63 |unction keys eac|
00000260 68 20 6f 66 20 32 35 36 20 62 79 74 65 73 20 65 |h of 256 bytes e|
00000270 61 63 68 20 69 6e 73 74 65 61 64 20 6f 66 20 6a |ach instead of j|
00000280 75 73 74 20 32 35 36 20 62 79 74 65 73 20 62 65 |ust 256 bytes be|
00000290 74 77 65 65 6e 20 31 30 2c 0d 70 61 67 65 73 20 |tween 10,.pages |
000002a0 6f 66 20 6d 61 69 6e 20 52 41 4d 20 63 61 6e 20 |of main RAM can |
000002b0 62 65 20 73 77 61 70 70 65 64 20 69 6e 20 61 6e |be swapped in an|
000002c0 64 20 6f 75 74 20 6f 66 20 53 57 52 20 28 70 61 |d out of SWR (pa|
000002d0 67 65 20 31 32 20 68 6f 6c 64 73 20 74 68 65 20 |ge 12 holds the |
000002e0 55 73 65 72 0d 44 65 66 69 6e 65 64 20 47 72 61 |User.Defined Gra|
000002f0 70 68 69 63 20 43 68 61 72 61 63 74 65 72 73 2c |phic Characters,|
00000300 20 73 65 76 65 72 61 6c 20 61 6c 74 65 72 6e 61 | several alterna|
00000310 74 69 76 65 20 55 44 47 20 73 65 74 20 63 6f 75 |tive UDG set cou|
00000320 6c 64 20 62 65 20 68 65 6c 64 20 69 6e 0d 76 61 |ld be held in.va|
00000330 72 69 6f 75 73 20 6d 65 6d 62 61 6e 6b 73 20 61 |rious membanks a|
00000340 6e 64 20 73 77 61 70 70 65 64 20 69 6e 20 74 6f |nd swapped in to|
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00005ac5 
29-10-88/E\INFO.m0
29-10-88/E\INFO.m1
29-10-88/E\INFO.m2
29-10-88/E\INFO.m4
29-10-88/E\INFO.m5
.