ISO-ROM

Because I have no description I can only describe features witch I have tried
out....

The BASIC improvements are:

The cursor keys (6 and 7) can also used by editing in the line.
#nnnn - edit line with number nnnn
@     - call the build in monitor from basic
,     - display the free memory for about 5 seconds
!     - in front of LOAD, SAVE, CAT ... The Beta-Disc-Interface is controlled
        in simpler syntax (!xx instead of RANDOMIZE USR 15363:REM:xx).

At least he following options are available in the monitor:

caps shift and h   - switch between HEX/DEC (display and input)
caps shift and t   - switch between byte/text display of the memory content
caps shift and 1   - load the top memory cell
caps shift and l   - load the flashing stack or register
caps shift and 5   - memory display -1
caps shift and 6   - memory display +64
caps shift and 7   - memory display -64
caps shift and 8   - memory display +1
caps shift and o   - stack and register choice -1
caps shift and p   - stack and register choice +1

symbol shift and h - the entered address will be processed as assembler CALL.
                     At the end (1. RET) the program returnes to the monitor.
                     Register contents are not considered!
symbol shift and y - executes a RET, continues at the point where the actual
                     program was interrupted by a NMI pulse (if the pulse was
                     short enough). The address to continue is displayed at the
                     top of the stack column.
SPACE              - set the actual memory cell to the entered value
RESET              - warm start
CAPS and RESET     - cold start

Quelle: http://www.zxspectrum.it/