Micro­power

will appear. Then proceed as if using ordinary Nas-Sys, with the following commands added:–

Enter D to return control to CP/M (or press RESET).

Enter Pxxxx yyyy to Put a section of memory onto the disc, where xxxx is the start of the block and yyyy is the end of it.

Enter Fxxxx to Fetch a section of memory from disc, where xxxx is the start of the memory into which you want the data to be put.

The Limitations

Because of the changes made to the monitor, programs that decide which monitor they are being run with by reading the first byte of the monitor will need to be modified. This includes ZEAP you will find.

When you are asked for a file name and type by the P and F commands, there is no check whether your input is sensible. File names in lower case in the directory are very difficult to get rid of, a fact you may or may not find useful.

Programs that write direct to the VDU RAM, or read from it, will need to be modified to take account of the change in the address of this RAM in CP/M systems. This does not apply to programs making use of the monitor’s screen handling routines, of course.

The Commercials

If you don’t fancy all the typing that this project will need, send me a properly initialised disc (sysgen, etc.) and a pound for post, packing and not a lot of profit, and I’ll save you the effort. The address is:

Chris Blackmore,
__, _____ ____,
Ilminster,
Somerset,
____ ___

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CP/M is a trade mark of Digital Research Ltd.

Nas-Sys is a trade mark of Nascom Microcomputers Ltd.

Chris Blackmore is Doctor Dark of the INMC magazine, and the author of the VORTEX graphics program.

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