Nascom News­let­ter

e

Erase a byte at a specified memory location and move the contents of memory down to fill the gap.

f

Find up to nine occurrences of a specified string (Hexadecimal or character string input.)

h

Convert a hexadecimal number in the range 0H to FFFFH to decimal.

i

Insert a byte at a specified memory location and move the contents of memory up to make space.

k

Keyboard input only. Suppress those annoying spurious characters when your cassette recorder switches off.

l

Label a cassette tape. Tape labels are displayed on the top line of the screen when tapes are read. Label names may be between zero and forty two characters long.

n

Return to NAS-SYS. (Rarely needed as all NAS-SYS commands can be used normally from within SYS-EX.)

q

Query tape contents. Read a cassette, scanning for and displaying all tapes program and file labels.

r

Read a named file. Works as for NAS-SYS ‘R’, but only loads the fiLe with the name you specify.

s

Search for and display the next tape label as written by the SYS-EX ‘l’ command.

t

Print on the top line of the screen. The required text can be typed in, or may come from any specified memory location.

u

Set up user routine addresses for the ‘x’, ‘y’ and ‘z’ commands.

v

Verify a named file. Works as for NAS-SYS ‘V”, but only verifies the file with the name you specify.

w

Writes a named file. Works as for NAS-SYS ‘W’, but first wites a file label with the name you specify. Names may be between zero and forty two characters in length.

x

Calls the user routine whose address is stored in ARG8. (ARG8 may be set up using the ‘u’ command.)

y

Calls the user routine whose address is stored in ARG9. (ARG9 may be set up using the ‘u’ command.)

z

Calls the user routine whose address is stored in ARG10. (ARG10 may be set up using the ‘u’ command.)

SYS-EX commands are entered in the same way as NAS-SYS commands except that the lower case letters of the alphabet are