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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Newsgroups: bit.listserv.ibm-main
- Path: sparky!uunet!gatech!paladin.american.edu!auvm!uvvm!klassen
- References: <92234.151249MEB117@psuvm.psu.edu>
- Message-ID: <92238.102030KLASSEN@UVVM>
- Date: Tue, 25 Aug 1992 10:20:30 PDT
- Sender: IBM Mainframe Discussion list <IBM-MAIN@RICEVM1.BITNET>
- Comments: Warning -- original Sender: tag was NETNEWS@UVVM.UVIC.CA
- From: Melvin Klassen <KLASSEN@UVVM.BITNET>
- Subject: Re: Zmodem for VM/CMS
- Lines: 98
-
- "Matthew E. Bernold" <MEB117@PSUVM.PSU.EDU> writes:
- >Sorry if this is the wrong place to post this, but I'm looking for a Zmodem
- >implication for the VM/CMS system running on an IBM mainframe.
-
- You won't find one, if postings from other mailing-lists can be believed!
- ________________________________________________________________________
-
- Date: Mon, 19 Aug 1991 16:42:00 CDT
- X-Sender: VM Utilities Discussion List <VM-UTIL@OHSTVMA>
- From: Neil Erdwien <NEIL@KSUVM>
- Subject: Re: ZMODEM and KERMIT
-
- >Is there any IBM VM/CMS program enabling ZModem file transfer
- >between the mainframe and a PC?
-
- ZMODEM: I know of no CMS implementation. ZMODEM gets some advantage by
- using the full duplex nature of most PC/Unix connections. Because the typical
- IBM front-end hardware can't do this, ZMODEM would help you little.
-
- I'm sure many people will respond to this -- KERMIT has some friends!
- I routinely get transfer rates over 90% of theoretical maximum, e.g.,
- 900 chars/sec on a 9600 BPS line. If you want noticeably faster transfer,
- you are going to need a faster transmission channel.
-
- Be sure you are using long packets -- I use 1900 bytes per packet.
- KERMIT also *DOES* do error correction.
-
-
- Date: Wed, 21 Aug 1991 15:05:00 EDT
- Sender: VM Utilities Discussion List <VM-UTIL@OHSTVMA>
- From: "John F. Chandler" <PEPMNT@CFAAMP.HARVARD.EDU>
- Subject: Re: ZModem for IBM VM/CMS system
-
- > I want to ask you if there is a VM/CMS port for X,Y,Z-Modem.
- There will almost assuredly never be any such products for CMS.
- Those programs assume some things that don't hold in most IBM/370-type
- systems: full-duplex, two-way 8-bit data channel. The foremost
- assumption is that of full-duplex transmission -- IBM mainframe
- architecture simply is incompatible with it, so that's just not going
- to happen (don't be confused by the possibility of type-ahead on
- protocol converters -- they aren't the mainframe).
-
-
- Date: Tue, 3 Mar 1992 12:53:44 PST
- Sender: VM Utilities Discussion List <VM-UTIL@OHSTVMA>
- From: "Russell N. Hathhorn, VM Systems Support" <SYSMAINT@PCCVM>
- Subject: where to find ZMODEM VM/CMS program ?
-
- You can find a VM/CMS Zmodem protocol in the same location as a
- 'MUFFLER BEARING' factory.
-
-
- Date: Tue, 3 Mar 1992 21:08:50 GMT
- Sender: VM Utilities Discussion List <VM-UTIL@OHSTVMA>
- From: "Korey J. Kruse" <kkruse@MATT.KSU.KSU.EDU>
- Subject: Re: where to find ZMODEM VM/CMS program ?
-
- This has come up before. Kermit is the only protocol that VM/CMS supports.
- This is because VM/CMS runs 7-bit data, with parity even with
- half-duplex (not sure about this last setting). Kermit is available
- free for both VM/CMS and for the dial-in computers, Apple, IBM PC, and
- a slew of others. ZMODEM just won't work.
-
-
- Date: Fri, 20 Mar 1992 22:49:22 CST
- Sender: VM Utilities Discussion List <VM-UTIL@OHSTVMA>
- From: Rich Chong <U41602@UICVM.UIC.EDU>
- Subject: Re: where to find ZMODEM VM/CMS program ?
-
- Sorry for a late reply on this... lets get things clear...
- Kermit is not the only [file transfer] protocol CMS supports.
- There are other vendor ones like Relay Gold's and IBM's IND$FILE.
- It's not because VM/CMS runs 7bit even-parity, as a matter of fact,
- that dependency is more the front-end processor (7171, 3705, Hydra, etc)
- definition. Right now I'm using a 9370 ascii subsystem FEP into a VM
- system at 8-bits no-parity no-problem ;-). Actually, ASCII is really
- only a 7-bit thing with parity, and people used that so much that
- another parity bit is sometimes used. IBM mainframe EBCDIC was always 8.
- The half-duplex nature of a real 3270 fullscreen (or IBM's old TTY)
- protocol is the main show-stopper. Now this isn't to be confused with
- the half/full duplex of your PC's comm. program or your modem. Those
- basically have to do with where the character may get echoed back
- (locally, remotely, not) rather than if the line really duplex capable.
- The problem is that the ASCII streaming protocols (X/Y/ZMODEM,etc)
- require a real full-duplex mode. Basically, this means that data can
- flow both ways at the same time. A streaming protocol basically shoots
- data down a line and won't stop until it's done or it hears that there
- is an error detected from the other end. In a real half-duplex line,
- this notification is not possible if one side is a jabbermouth.
-
-
- Date: Mon, 23 Mar 1992 18:51:00 EST
- Sender: VM Utilities Discussion List <VM-UTIL@OHSTVMA>
- From: "John F. Chandler" <PEPMNT@CFAAMP>
- Subject: Re: where to find ZMODEM VM/CMS program ?
-
- > Kermit is not the only [file transfer] protocol CMS supports.
- True, but it's the only protocol supported by other types of computer as well.
-