Letter from Peter McMullin to SyncWare News

Dear Mr. Bent & Mr. Woods:

Please accept the enclosed documented program as my entry in your Display Utilities Contest (ZX81).

I realize this entry stretches your rules a bit. So many screen utilities have been published for the ZX81 that it would seem difficult to come up with something completely original. Therefore, my entry, while very much a “Display Utility” and my own creation, addresses a specific challenge inherent in a very popular hardware add-on.

My PRTSC Utility uses the ZX ROM character generator to copy the screen as you see it to any EPSON-workalike printer via the MEMOPAK Centronics I/F.

Documentation covers modifying the program to work with printers which use non-standard graphics escape codes.