Path: utzoo!mnetor!uunet!husc6!cmcl2!brl-adm!umd5!rutgers!ames!ucbcad!ucbvax!RAND-UNIX.ARPA!bridger%rcc
From: bridger%rcc@RAND-UNIX.ARPA
Newsgroups: comp.os.cpm
Subject: Re: CP/M Plus, Banked ZRDOS, Z280
Message-ID: <8712141855.AA10189@newton.arpa>
Date: 14 Dec 87 18:55:21 GMT
References: <4290@ecsvax.UUCP>
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 38

1. Z280:
Scott Moore at Zedux, 818-787-0113 voice, 818-787-0458 bbs has a Z280
board running with a multi-tasking OS he supplies with it.  It
supports multiple cp/m partitions, but not zcpr3.

2. Z3ON3 -- the port of ZCPR33 to CP/M 3 (CP/M PLUS) that is under
development -- will provide essentially all ZCPR3 features on a CP/M 3
system, including:

	z3 external environment descriptor
	zcpr33 command processor
	flow control (FCP)
	resident command processor (RCP),
	z3 termcap
	z3 named directories
	but NOT: input/output packages (IOP).

Most CP/M 3 features remain active:
	hashed directories
	bdos disk buffering
	RSX capability, including PUT/GET redirection

There are some changes:
	multiple command line is zcpr3 style
	file-level passwords not supported by the command processor

Importantly, no bios changes are required -- Z3ON3 will be a "drop-in"
RSX; the user will install and remove "ZCPR33" features from a cp/m 3
system dynamically, with one command.


3. Echelon developed a banked version of ZRDOS for the DT-42, with a
cp/m 2.2 bios.  I don't believe any other banked versions have been
developed.  Trying to do one for a CP/M 3 bios would be problematic
at best, because CP/M 3 makes fundamental changes in the bios/bdos
disk i/o interface.

--bridger