This archive contains the following executable programs :-

BASIC522.COM,z80
BAS522FP.COM,z80
BASIC531.COM,z80
BAS531FP.COM,z80
(Remove the “,z80” from the file extensions before FTP’ing or copying the files to the MTX.)

USAGE

The “522” programs are for CP/M 2.2
The “531” programs are for CP/M 3.1

The “FP” versions are for use with MFX with Cyclone IV (red) FPGA boards and support floating point maths using the numeric accelerator configured in the FPGA.

Over and above the output options of the original BBC BASIC for CPM, all 4 versions of BASIC 5 have:

	COLOUR x	0 to 7 set the foreground text colour, 
			128 to 135 set the background colour
	MODE x 		mode 0 is 80x24, 
			mode 1 is 80x48
	OFF 		turns off the cursor
	ON 		turns on the cursor

In addition the CPM2 versions have block graphics on a virtual resolution of 1280 x 768. The actual plot resolution depends on the screen mode. All positions are absolute, there’s no relative drawing. If the start or end of a line is off the screen nothing is drawn, as the driver does not support clipping.

	DRAW x,y
	GCOL x		0 to 7 set the foreground plot colour, 
			128 to 135 set the background colour
	LINE x1,y1,x2,y2
	MOVE x,y
	PLOT x,y

The 2 FP versions run all the FP maths through the Red4 FPGA for a 10-15% speed up on average. Attempting to run those programs on MFX with Cyclone II (blue) FPGA boards will give unpredictable results and should be avoided. The non-FP programs can be run on machines with and without the numeric accelerator, including non-MFX systems.

A consequence of the extra commands the CPM2 version is 256 bytes bigger and therefore has that much less program space in addition to the smaller memory space to start with. CPM3 has 41.5K for the program, CPM2 gets a smaller but still useful 34K.


KEYBOARD FUNCTIONS

For compatibility with the MTX keyboard, the editing keys used in BASIC5 have been modified as listed below:

Up and Home	Move to the start of the line
Down and EOL	Move to the end of the line
Ctrl X		Clear everything Left
Ctrl C and BRK 	Delete Left
DEL     	Delete the Character under the Cursor
INS     	Toggle insert/Overtype
Left and BS     Cursor left
Right     	Cursor right