[Coco] Xmodem, Ymodem

[George Ramsower]

From: "Gene Heskett"

> What version of zmodem, George?

Here is what I have:

Header for:  Dloadx
Module size: $0388    #904
Module CRC:  $5980B1 (Good)
Hdr parity:  $A3
Exec. off:   $0145    #325
Data Size:   $01A0    #416
Edition:     $43      #67
Ty/La At/Rv: $11 $81
Prog mod, 6809 obj, re-en, R/O

Header for:  Dloady
Module size: $0401    #1025
Module CRC:  $FA419E (Good)
Hdr parity:  $2D
Exec. off:   $0147    #327
Data Size:   $0525    #1317
Edition:     $43      #67
Ty/La At/Rv: $11 $81
Prog mod, 6809 obj, re-en, R/O


 This is from OS9-LII BBS



>
> AFAIK, rzsz-3.36, the last one I built, should work against any other 
> zmodem
> extant unless mickeysoft has "improved" it somehow on the pc end. 3.36,
> running on nitros9/6309 machines can keep a 9600 baud port fairly busy.  I
> was getting around 7400 baud. zmodems crc calculations on a per byte rx'd
> preclude even thinking about getting ymodem speeds, but they also 
> guarantee
> data purity.  On noisy phone lines 10+ miles from the CO, I never had a
> binaries crc get trashed.  zmodem error recovery restarts on a per block
> basis of course, but never any bad data on the hard drive when it was 
> done.
> zmodem can also restart where it left off if you get disconnected, see the
> help screen when you make a mistake for that syntax.
>
> OTOH, I can't get it to work here either, but that (I think) is because I
> don't have the right descriptor in my bootfile for '7 wire' handshaking.
> RTS/CTS flow controls in other words.  I've asked here, but it seems to be 
> a
> lost art, no one has pointed me to a working /t2 & sacia (or aciapak)
> descriptor.  Or maybe I have 1488/1489 problems in the rs232 pack?  I can
> type back and forth from machine to machine most of the time, but file
> transfers fail within 10 bytes and eventually give up.
>
> Humm, thinking out loud here, the last time I tried that, I was using a 
> pl2303
> based usb<->serial adapter, and we've since found its a POC, won't work 
> with
> roadnav, and won't work with heyu about 10% of the time. I should try that
> using an FDTI adapter as they work quite well.
>
> -- 
> Cheers, Gene
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Conscience is the inner voice that warns us somebody may be looking.
> -- H.L. Mencken, "A Mencken Chrestomathy"
>
> --
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