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Update BBC BASIC

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- Updated BBC BASIC (Z80) source from R.T.Russell's repository.
This commit is contained in:
Wayne Warthen
2025-02-17 17:21:44 -08:00
parent da05245b4a
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251
Source/Apps/BBCBASIC/bbcbasic.txt
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@@ -1,16 +1,21 @@
This is a RomWBW HBIOS adaptation of BBCBASIC v5.00. The
cursor and screen management assumes the use of an ANSI/VT-100 terminal
which is generally correct for RomWBW. Support for a hardware system
timer is also implemented. If your system does not have a hardware
timer, the TIME function will always return 0 and the timeout
This is a RomWBW HBIOS adaptation of BBCBASIC v5.00 by R.T.Russell.
This implementation was adapted from the source code found at
https://github.com/rtrussell/BBCZ80.
The cursor and screen management assumes the use of an ANSI/VT-100
terminal which is generally correct for RomWBW. Support for a hardware
system timer is also implemented. If your system does not have a
hardware timer, the TIME function will always return 0 and the timeout
parameter of the INKEY(n) function will not be observed (will never
timeout).
What follows is some basic information on BBCBASIC from the
distribution. Note that it starts with the v3.00 information and
later on provides information on the changes in v5.00.
later on provides information on the changes in v5.00. Complete
documentation for the BBC BASIC (Z80) is found online at
https://www.bbcbasic.co.uk/bbcbasic/mancpm/index.html.
-- WBW 1:15 PM 5/30/2024
-- WBW 4:21 PM 2/17/2025
@@ -23,55 +28,55 @@ later on provides information on the changes in v5.00.
1. INTRODUCTION
BBC BASIC (Z80) has been designed to be as compatible as possible with
Version 4 of the 6502 BBC BASIC resident in the BBC Micro Master series.
The language syntax is not always identical to that of the 6502 version,
BBC BASIC (Z80) has been designed to be as compatible as possible with
Version 4 of the 6502 BBC BASIC resident in the BBC Micro Master series.
The language syntax is not always identical to that of the 6502 version,
but in most cases the Z80 version is more tolerant.
BBC BASIC (Z80) is as machine independent as possible and, as supplied,
it will run on any CP/M 2.2 (or later) system using a Z80 processor
(checks are carried out to ensure that the processor is a Z80 and that
the version of CP/M is at least 2.2). It is minimally configured for an
BBC BASIC (Z80) is as machine independent as possible and, as supplied,
it will run on any CP/M 2.2 (or later) system using a Z80 processor
(checks are carried out to ensure that the processor is a Z80 and that
the version of CP/M is at least 2.2). It is minimally configured for an
ADM3a-compatible VDU.
Few CP/M systems offer colour graphics of the quality provided as
standard on the BBC Microcomputer, and no software can provide colour
high-resolution graphics from a monochrome character-orientated computer.
However, many CP/M system users are interested in the advanced program
structures available from BBC BASIC and, within the limitations of the
host computer, BBC BASIC (Z80) provides the programming structures and
Few CP/M systems offer colour graphics of the quality provided as
standard on the BBC Microcomputer, and no software can provide colour
high-resolution graphics from a monochrome character-orientated computer.
However, many CP/M system users are interested in the advanced program
structures available from BBC BASIC and, within the limitations of the
host computer, BBC BASIC (Z80) provides the programming structures and
the non-graphic commands and functions specified for BBC BASIC.
In order to make full use of the facilities available in BBC BASIC (Z80)
it is necessary to install a small patch to adapt it to the capabilities
of the host computer. The source code of the patch present in the
In order to make full use of the facilities available in BBC BASIC (Z80)
it is necessary to install a small patch to adapt it to the capabilities
of the host computer. The source code of the patch present in the
distribution version is supplied as BBCDIST.MAC.
This documentation should be read in conjunction with a standard BBC
BASIC manual. Only those features which differ from the standard Acorn
This documentation should be read in conjunction with a standard BBC
BASIC manual. Only those features which differ from the standard Acorn
versions are documented here.
2. MEMORY UTILISATION
BBC BASIC (Z80) requires about 16 Kbytes of code space, resulting in a
value of PAGE of about &3E00. The remainder of the user memory is
available for BASIC programs, variables (heap) and stack. Depending on
BBC BASIC (Z80) requires about 16 Kbytes of code space, resulting in a
value of PAGE of about &3E00. The remainder of the user memory is
available for BASIC programs, variables (heap) and stack. Depending on
the system configuration, HIMEM can have a value up to &FE00.
3. COMMANDS, STATEMENTS AND FUNCTIONS
The syntax of BASIC commands, statements and functions is in most cases
identical to that of the BBC Micro version (BASIC 4). The few
The syntax of BASIC commands, statements and functions is in most cases
identical to that of the BBC Micro version (BASIC 4). The few
differences are documented here:
ADVAL
This function is not implemented.
CALL
CALL sets up a table in RAM containing details of the parameters; the
processor's IX register is set to the address of this parameter table.
CALL sets up a table in RAM containing details of the parameters; the
processor's IX register is set to the address of this parameter table.
The other processor registers are initialised as follows:
A is initialised to the least significant byte of A%
@@ -92,7 +97,7 @@ later on provides information on the changes in v5.00.
128 Fixed string $A%
129 Movable string A$
On entry to the subroutine the parameter table contains the following
On entry to the subroutine the parameter table contains the following
values:
Number of parameters 1 byte (at IX)
@@ -103,29 +108,29 @@ later on provides information on the changes in v5.00.
Parameter type ) repeated as often as necessary
Parameter address )
Except in the case of a movable string (normal string variable), the
parameter address given is the absolute address at which the item is
stored. In the case of movable strings (type 129) it is the address of a
4-byte parameter block containing the current length, the maximum length
Except in the case of a movable string (normal string variable), the
parameter address given is the absolute address at which the item is
stored. In the case of movable strings (type 129) it is the address of a
4-byte parameter block containing the current length, the maximum length
and the start address of the string (LSB first) in that order.
Integer variables are stored in twos complement form with their least
Integer variables are stored in twos complement form with their least
significant byte first.
Fixed strings are stored as the characters of the string followed by a
Fixed strings are stored as the characters of the string followed by a
carriage return (&0D).
Floating point variables are stored in binary floating point format with
their least significant byte first; the fifth byte is the exponent. The
mantissa is stored as a binary fraction in sign and magnitude format.
Bit 7 of the most significant byte is the sign bit and, for the purposes
of calculating the magnitude of the number, this bit is assumed to be set
to one. The exponent is stored as an integer in excess 127 format (to
Floating point variables are stored in binary floating point format with
their least significant byte first; the fifth byte is the exponent. The
mantissa is stored as a binary fraction in sign and magnitude format.
Bit 7 of the most significant byte is the sign bit and, for the purposes
of calculating the magnitude of the number, this bit is assumed to be set
to one. The exponent is stored as an integer in excess 127 format (to
find the exponent subtract 127 from the value in the fifth byte).
If the exponent byte of a floating point number is zero, the number is an
integer stored in integer format in the mantissa bytes. Thus an integer
can be represented in two different ways in a real variable. For example
If the exponent byte of a floating point number is zero, the number is an
integer stored in integer format in the mantissa bytes. Thus an integer
can be represented in two different ways in a real variable. For example
the value +5 can be stored as:
05 00 00 00 00 Integer 5
@@ -138,15 +143,15 @@ later on provides information on the changes in v5.00.
This statement is not implemented.
EDIT
A command to edit or concatenate and edit the specified program line(s).
The specified lines (including their line numbers) are listed as a single
line. By changing only the line number you can use EDIT to duplicate a
A command to edit or concatenate and edit the specified program line(s).
The specified lines (including their line numbers) are listed as a single
line. By changing only the line number you can use EDIT to duplicate a
line.
EDIT 230
EDIT 200,230
The following control functions are active both in the EDIT mode and in
The following control functions are active both in the EDIT mode and in
the immediate entry mode (i.e. at the BASIC prompt):
Move the cursor one character position to the left
@@ -159,8 +164,8 @@ later on provides information on the changes in v5.00.
Delete all characters to the left of the cursor
Delete all characters from the cursor to the end of the line
The choice of which keys activate these functions is made when BBC BASIC
is configured for a particular system. The distribution version uses ^H,
The choice of which keys activate these functions is made when BBC BASIC
is configured for a particular system. The distribution version uses ^H,
^I, ^K, ^J, ^A, ^E, DEL (&7F), ^L and ^X.
To exit EDIT mode and replace the edited line, type RETURN (ENTER).
@@ -171,28 +176,28 @@ later on provides information on the changes in v5.00.
This statement is not implemented.
GET
This function waits for a character to be typed at the keyboard, and
This function waits for a character to be typed at the keyboard, and
returns the ASCII code.
GET can also be used to read data from a processor I/O port; full 16-bit
GET can also be used to read data from a processor I/O port; full 16-bit
port addressing is available:
N% = GET(X%) : REM input from port X%
INKEY
This function waits for a specified maximum number of centiseconds for a
character to be typed at the keyboard. If no character is typed in that
time, the value -1 is returned. In the distribution version the delay is
determined by a simple software timing loop, and may be very inaccurate.
The customisation patch allows this to be adjusted to suit the system in
This function waits for a specified maximum number of centiseconds for a
character to be typed at the keyboard. If no character is typed in that
time, the value -1 is returned. In the distribution version the delay is
determined by a simple software timing loop, and may be very inaccurate.
The customisation patch allows this to be adjusted to suit the system in
use.
INPUT#
The format of data files is different from that used by the BBC Micro, in
part to improve compatibility with standard CP/M files. Numeric values
are stored as five bytes in the format documented under CALL; if the
fifth byte is zero the value is an integer. Strings are stored as the
characters of the string (in the correct order!) followed by a carriage
The format of data files is different from that used by the BBC Micro, in
part to improve compatibility with standard CP/M files. Numeric values
are stored as five bytes in the format documented under CALL; if the
fifth byte is zero the value is an integer. Strings are stored as the
characters of the string (in the correct order!) followed by a carriage
return (&0D).
MODE
@@ -208,15 +213,15 @@ later on provides information on the changes in v5.00.
This function is not implemented.
PRINT#
The format of data files is different from that used by the BBC Micro, in
part to improve compatibility with standard CP/M files. Numeric values
are stored as five bytes in the format documented under CALL; if the
fifth byte is zero the value is an integer. Strings are stored as the
characters of the string (in the correct order!) followed by a carriage
The format of data files is different from that used by the BBC Micro, in
part to improve compatibility with standard CP/M files. Numeric values
are stored as five bytes in the format documented under CALL; if the
fifth byte is zero the value is an integer. Strings are stored as the
characters of the string (in the correct order!) followed by a carriage
return (&0D).
PUT
A statement to output data to a processor port. Full 16-bit addressing
A statement to output data to a processor port. Full 16-bit addressing
is available.
PUT A%,N% : REM Output N% to port A%
@@ -225,7 +230,7 @@ later on provides information on the changes in v5.00.
This statement is not implemented.
TIME
This pseudo-variable is not implemented in the distribution version, but
This pseudo-variable is not implemented in the distribution version, but
can be supported by means of the customisation patch. See BBCDIST.MAC.
USR
@@ -240,34 +245,34 @@ later on provides information on the changes in v5.00.
H is initialised to the least significant byte of H%
L is initialised to the least significant byte of L%
USR returns a 32-bit integer result composed of the processor's H, L, H'
USR returns a 32-bit integer result composed of the processor's H, L, H'
and L' registers, with H being the most significant.
4. RESIDENT Z80 ASSEMBLER
The in-line assembler is accessed in exactly the same way as the 6502
assembler in the BBC Micro version of BBC BASIC. That is, '[' enters
The in-line assembler is accessed in exactly the same way as the 6502
assembler in the BBC Micro version of BBC BASIC. That is, '[' enters
assembler mode and ']' exits assembler mode.
All standard Zilog mnemonics are accepted: ADD, ADC and SBC must be
followed by A or HL. For example, ADD A,C is accepted but ADD C is not.
However, the brackets around the port number in IN and OUT are optional.
Thus both OUT (5),A and OUT 5,A are accepted. The instruction IN F,(C)
All standard Zilog mnemonics are accepted: ADD, ADC and SBC must be
followed by A or HL. For example, ADD A,C is accepted but ADD C is not.
However, the brackets around the port number in IN and OUT are optional.
Thus both OUT (5),A and OUT 5,A are accepted. The instruction IN F,(C)
is not accepted, but the equivalent code is produced from IN (HL),C
The pseudo-ops DEFB, DEFW and DEFM are included. DEFM works like EQUS in
The pseudo-ops DEFB, DEFW and DEFM are included. DEFM works like EQUS in
the 6502 version.
5. OPERATING SYSTEM INTERFACE
The following resident Operating System ("star") commands are
implemented. They may be accessed directly (e.g. *BYE) or via the OSCLI
The following resident Operating System ("star") commands are
implemented. They may be accessed directly (e.g. *BYE) or via the OSCLI
statement (OSCLI "BYE").
Control characters, lower-case characters, DEL and quotation marks may be
incorporated in filenames by using the 'escape' character '|'. However,
Control characters, lower-case characters, DEL and quotation marks may be
incorporated in filenames by using the 'escape' character '|'. However,
there is no equivalent to the BBC Microcomputer's '|!' to set bit 7.
*BYE
@@ -278,7 +283,7 @@ later on provides information on the changes in v5.00.
*. [filespec]
*DIR [filespec]
List the files which match the (optional) ambiguous filespec. If the
List the files which match the (optional) ambiguous filespec. If the
filespec is omitted, all .BBC files are listed:
*DIR List all .BBC files on the disk
*DIR B:*.* List all files on disk B:
@@ -288,53 +293,53 @@ later on provides information on the changes in v5.00.
Select drive d as the default drive for subsequent disk operations.
*ERA filespec
Erase (delete) the specified disk file or files. The extension defaults
Erase (delete) the specified disk file or files. The extension defaults
to .BBC if omitted.
*ESC [ON|OFF]
*ESC OFF disables the abort action of the ESCape key; after *ESC OFF the
ESCape key simply returns the ASCII code ESC (27). *ESC ON, or *ESC,
*ESC OFF disables the abort action of the ESCape key; after *ESC OFF the
ESCape key simply returns the ASCII code ESC (27). *ESC ON, or *ESC,
restores the normal action of the ESCape key.
*EXEC filespec
Accept console input from the specified file instead of from the
Accept console input from the specified file instead of from the
keyboard. If the extension is omitted, .BBC is assumed.
*LOAD filespec aaaa
Loads the specified file into memory at address aaaa. The load address
Loads the specified file into memory at address aaaa. The load address
must be specified. If the extension is omitted, .BBC is assumed.
*OPT [n]
Select the destination for console output characters. The value n is in
Select the destination for console output characters. The value n is in
the range 0 to 2, as follows:
0 Send characters to the console output
1 Send characters to the auxiliary output
2 Send characters to the printer (list) output
*REN newfile=oldfile
*RENAME newfile=oldfile
Renames 'oldfile' as 'newfile'. If the extension is omitted, .BBC is
Renames 'oldfile' as 'newfile'. If the extension is omitted, .BBC is
assumed.
*RESET
Rest the disk system (CP/M function 13). This command does not close any
files nor does it perform any other housekeeping function. You should
Rest the disk system (CP/M function 13). This command does not close any
files nor does it perform any other housekeeping function. You should
use *RESET after you have changed a disk.
*SAVE filespec aaaa bbbb
*SAVE filespec aaaa +llll
This command saves a specified range of memory to disk. The address range
is specified either as start (aaaa) and end+1 (bbbb) or as start (aaaa)
This command saves a specified range of memory to disk. The address range
is specified either as start (aaaa) and end+1 (bbbb) or as start (aaaa)
and length (llll). If the extension is omitted, .BBC is assumed.
*SPOOL [filespec]
Copy all subsequent console output to the specified file. If the filename
is omitted, any current spool file is closed and spooling is terminated.
Copy all subsequent console output to the specified file. If the filename
is omitted, any current spool file is closed and spooling is terminated.
If the extension is omitted, .BBC is assumed.
*TYPE filespec
Type the specified file to the screen. If the extension is omitted, .BBC
Type the specified file to the screen. If the extension is omitted, .BBC
is assumed.
*| comment
@@ -352,7 +357,7 @@ later on provides information on the changes in v5.00.
Trappable - BASIC:
1 Out of range 24 Exp range
2 25
2 25
3 26 No such variable
4 Mistake 27 Missing )
5 Missing , 28 Bad HEX
@@ -383,9 +388,9 @@ later on provides information on the changes in v5.00.
198 Disk full 254 Bad command
200 Close error 255 CP/M error
204 Bad name

New features in BBC BASIC (Z80) version 5.00, May 2024:
New features in BBC BASIC (Z80) version 5.00, January 2025:
1. BASIC V statements
@@ -394,7 +399,7 @@ New features in BBC BASIC (Z80) version 5.00, May 2024:
1.3 CASE...WHEN...OTHERWISE...ENDCASE
1.4 LOCAL DATA / RESTORE DATA
1.5 ON ERROR LOCAL / RESTORE ERROR
1.6 DIM var LOCAL size
1.6 DIM var LOCAL size
1.7 ERROR err, message$
1.8 RESTORE +n
1.9 SWAP var1,var2
@@ -408,10 +413,10 @@ New features in BBC BASIC (Z80) version 5.00, May 2024:
2.3 REPORT$
2.4 Binary constants
2.5 LEFT$ & RIGHT$ with last parameter omitted
2.6 MOD(array)
2.7 SUM(array)
2.8 SUMLEN(array)
2.9 GET$#file
2.6 MOD(array())
2.7 SUM(array())
2.8 SUMLEN(array())
2.9 GET$#file
3. BASIC V whole array operations
@@ -423,9 +428,12 @@ New features in BBC BASIC (Z80) version 5.00, May 2024:
3.6 Array initialisation lists
3.7 Array compound assignment (+= etc.)
3.8 Make a whole array LOCAL
3.9 DIM a LOCAL array (on the stack) +
3.9 DIM a LOCAL array (on the stack) +
* String array expressions are not currently supported, instead of using
a$() = b$() + c$() use a$() = b$() : a$() += c$()
The use of EVAL with whole-array expressions is not currently supported.
* String array expressions A$() = B$() + C$() are not currently supported.
+ LOCAL string arrays should be initialised to their maximum needed length
to eliminate the risk of a memory leak each time the PROC/FN is called:
LOCAL a$() : DIM a$(size%) : a$() = STRING$(max%, "a") : a$() = ""
@@ -434,22 +442,27 @@ New features in BBC BASIC (Z80) version 5.00, May 2024:
4.1 Bit-shifts <<, >>, >>>
4.2 Floating-point indirection (|)
4.3 RETURNed parameters from FN/PROC
4.4 Compound assignment (+=, -=, *=, /= etc.)
4.5 Assigning to a sub-string: LEFT$()=, MID$()= , RIGHT$()=
4.6 Hooks for CIRCLE,ELLIPSE,FILL,LINE,MOUSE,ORIGIN,RECTANGLE,TINT,SYS,WAIT
4.7 Hooks for WIDTH function, TINT function, MODE function
4.3 Additional VDU delimiter '|'
4.4 RETURNed parameters from FN/PROC
4.5 Compound assignment (+=, -=, *=, /= etc.)
4.6 Assigning to a sub-string: LEFT$()=, MID$()= , RIGHT$()=
4.7 Hooks for CIRCLE, ELLIPSE, FILL, LINE, ORIGIN, RECTANGLE (graphics)
4.8 Hooks for MOUSE, OFF, ON, SYS, TINT, WAIT (statements)
4.9 Hooks for MODE function, TINT function, WIDTH function
5. Extensions to Acorn's BASIC V, compatible with BB4W, BBCSDL and BBCTTY
5.1 EXIT REPEAT / WHILE / FOR [var]
5.2 Address-of operator ^
5.3 Byte variables and arrays (& suffix)
5.2 Address-of operator (^)
5.3 Byte (unsigned 8-bit) variables and arrays (& suffix)
5.4 'BY len' and 'TO term' qualifiers to GET$#file
5.5 ELSE IF <condition> THEN; (trailing semicolon)
5.6 == synonymous with = in comparisons
5.7 DIM a global array inside a FN/PROC (use RETURN)
5.8 DIM var LOCAL -1 returns the stack pointer, even outside a FN/PROC
5.9 RESTORE LOCAL restores local variables without exiting the FN/PROC
Note: The token for PUT has changed from &CE in version 3 to &0E in version 5.
If this token is present in existing programs it will list as ENDWHILE rather
than PUT, and the programs will need to be modified to restore functionality.
than PUT, and the programs will need to be modified to restore functionality.


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@@ -1,64 +1,68 @@
NAME ('HOOK')
;
GLOBAL CLG
GLOBAL COLOUR
GLOBAL DRAW
GLOBAL ENVEL
GLOBAL GCOL
GLOBAL MODE
GLOBAL MOVE
GLOBAL PLOT
GLOBAL SOUND
GLOBAL PUTIMS
GLOBAL CIRCLE
GLOBAL ELLIPSE
GLOBAL FILL
GLOBAL MOUSE
GLOBAL ORIGIN
GLOBAL RECTAN
GLOBAL LINE
GLOBAL TINT
GLOBAL WAIT
GLOBAL SYS
;
GLOBAL ADVAL
GLOBAL POINT
GLOBAL GETIMS
GLOBAL TINTFN
GLOBAL MODEFN
GLOBAL WIDFN
;
EXTRN EXTERR
;
CLG:
COLOUR:
DRAW:
ENVEL:
GCOL:
MODE:
MOVE:
PLOT:
SOUND:
ADVAL:
POINT:
GETIMS:
PUTIMS:
CIRCLE:
ELLIPSE:
FILL:
MOUSE:
ORIGIN:
RECTAN:
LINE:
TINT:
TINTFN:
MODEFN:
WIDFN:
WAIT:
SYS:
XOR A
CALL EXTERR
DEFM 'Sorry'
DEFB 0
;
END
NAME ('HOOK')
;
GLOBAL CLG
GLOBAL COLOUR
GLOBAL DRAW
GLOBAL ENVEL
GLOBAL GCOL
GLOBAL MODE
GLOBAL MOVE
GLOBAL PLOT
GLOBAL SOUND
GLOBAL PUTIMS
GLOBAL CIRCLE
GLOBAL ELLIPS
GLOBAL FILL
GLOBAL MOUSE
GLOBAL ORIGIN
GLOBAL RECTAN
GLOBAL LINE
GLOBAL TINT
GLOBAL WAIT
GLOBAL SYS
GLOBAL CSRON
GLOBAL CSROFF
;
GLOBAL ADVAL
GLOBAL POINT
GLOBAL GETIMS
GLOBAL TINTFN
GLOBAL MODEFN
GLOBAL WIDFN
;
EXTRN EXTERR
;
CLG:
COLOUR:
DRAW:
ENVEL:
GCOL:
MODE:
MOVE:
PLOT:
SOUND:
ADVAL:
POINT:
GETIMS:
PUTIMS:
CIRCLE:
ELLIPS:
FILL:
MOUSE:
ORIGIN:
RECTAN:
LINE:
TINT:
TINTFN:
MODEFN:
WIDFN:
WAIT:
SYS:
CSRON:
CSROFF:
XOR A
CALL EXTERR
DEFM 'Sorry'
DEFB 0
;
END

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@@ -0,0 +1,19 @@
Copyright (c) 2024, Richard T. Russell, http://www.rtrussell.co.uk/
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.

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