Anything CP/M
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CP/M Programmer’s Utilities Guide recreation
maciaszek.net Programmer’s Utilities Guide recreationDigital Research’s Programmer’s Utilities Guide (for CP/M) as a cleanly typeset, searchable, and hyperlinked PDF.
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CP/M's open-source status clarified after 21 years - by Liam Proven
www.theregister.com CP/M's open-source status clarified after 21 yearsThe venerable Z80 OS is a now hobbyist favorite
Link to the new license: http://www.cpm.z80.de/license.html
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