RetroBrew Computers Forum: General Discussion » xmodem-1K, ymodem, or zmodem

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Re: xmodem-1K, ymodem, or zmodem [message #9028 is a reply to message #9027]

Sat, 21 August 2021 12:36

Wayne W
Messages: 385
Registered: October 2015
Location: Fallbrook, California, US...

Senior Member

Hi Phil,

I was ultimately successful. Initially, I found that I could do XModem send or receive and YModem send or receive. I could, as did you, do ZModem send. When I tried ZModem receive, I got "Subpkt too long" errors (see first screenshot). After some head scratching, I found that Tera Term has a ZModem parameter called "ZmodemWinSize". It was set to 32767 in the default configuration. I changed this to 4096, and ZModem receive began to work. This setting applies to the remote side of the connection. See the second screenshot.

Oh, I should mention that the ZmodemWinSize setting in Tera Term is found in the .INI file that Tera Term uses to save settings. It is not found anywhere in the user interface itself, so you need to edit the .INI file directly.

The obvious conclusion from all this is that modern implementations of ZModem assume a larger working buffer on the other side than is reasonably available on an 8-bit system. This was an interesting challenge.

Anyway, hope this is helpful. ZMP appears to be a truly worthwhile application.

Thanks for working on this!

-Wayne

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Attachment: ZModem Success.png
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Attachment: ZModem Error.png
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[Message index]

		xmodem-1K, ymodem, or zmodem By: lynchaj on Wed, 28 July 2021 07:23
		Re: xmodem-1K, ymodem, or zmodem By: edzard on Wed, 28 July 2021 08:11
		Re: xmodem-1K, ymodem, or zmodem By: scruss on Wed, 28 July 2021 11:56
		Re: xmodem-1K, ymodem, or zmodem By: lynchaj on Thu, 29 July 2021 03:15
		Re: xmodem-1K, ymodem, or zmodem By: b1ackmai1er on Sat, 31 July 2021 11:06
		Re: xmodem-1K, ymodem, or zmodem By: b1ackmai1er on Wed, 11 August 2021 07:41
		Re: xmodem-1K, ymodem, or zmodem By: lynchaj on Wed, 11 August 2021 08:20
		Re: xmodem-1K, ymodem, or zmodem By: Wayne W on Wed, 11 August 2021 17:47
		Re: xmodem-1K, ymodem, or zmodem By: b1ackmai1er on Thu, 12 August 2021 06:46
		Re: xmodem-1K, ymodem, or zmodem By: Wayne W on Thu, 12 August 2021 12:34
		Re: xmodem-1K, ymodem, or zmodem By: b1ackmai1er on Thu, 19 August 2021 07:49
		Re: xmodem, ymodem, zmodem By: jayindallas on Fri, 20 August 2021 06:26
		Re: xmodem-1K, ymodem, or zmodem By: Wayne W on Fri, 20 August 2021 19:47
		Re: xmodem-1K, ymodem, or zmodem By: Wayne W on Sat, 21 August 2021 12:36
		Re: xmodem-1K, ymodem, or zmodem By: b1ackmai1er on Sat, 21 August 2021 18:15
		Re: xmodem-1K, ymodem, or zmodem By: plasmo on Sat, 21 August 2021 19:04
		Re: xmodem-1K, ymodem, or zmodem By: Wayne W on Sat, 21 August 2021 20:04
		Re: xmodem-1K, ymodem, or zmodem By: b1ackmai1er on Sun, 22 August 2021 02:06
		Re: xmodem-1K, ymodem, or zmodem By: b1ackmai1er on Sun, 22 August 2021 03:46
		Re: xmodem-1K, ymodem, or zmodem By: Wayne W on Sun, 22 August 2021 07:09
		Re: xmodem-1K, ymodem, or zmodem By: Wayne W on Sun, 22 August 2021 07:08
		Re: xmodem-1K, ymodem, or zmodem By: Wayne W on Sun, 22 August 2021 07:13
		Re: xmodem-1K, ymodem, or zmodem By: lynchaj on Sun, 22 August 2021 09:37
		Re: xmodem-1K, ymodem, or zmodem By: plasmo on Sun, 22 August 2021 11:56
		Re: xmodem-1K, ymodem, or zmodem By: agn453 on Sun, 22 August 2021 22:37
		Re: xmodem-1K, ymodem, or zmodem By: lynchaj on Mon, 23 August 2021 06:23
		Re: xmodem-1K, ymodem, or zmodem By: Wayne W on Mon, 23 August 2021 11:10
		Re: xmodem-1K, ymodem, or zmodem By: lynchaj on Mon, 23 August 2021 11:32
		Re: xmodem-1K, ymodem, or zmodem By: lynchaj on Tue, 12 October 2021 04:13
		Re: xmodem-1K, ymodem, or zmodem By: Wayne W on Sun, 22 August 2021 07:01
		Re: xmodem-1K, ymodem, or zmodem By: lynchaj on Tue, 12 October 2021 04:27

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