treid@MITRE-GATEWAY.ARPA (Tom Reid) (05/01/85)
I have been trying to get my Kaypro to work on our LAN at 9600 baud through a ROLM data phone (Kaypro goes to back of phone with a normal RS-232 cable). The Kaypro is a IIx with two serial and one parallel ports. The symptoms are problem is that about 1/3 of the characters are lost on data from the LAN. The Kaypro works fine on 1200 baud with a Ventel modem and dialup. Is this a known problem with the Kaypro's? Or do all roads lead to ROLM? Thanks in advance for any help. Tom.
harmonj%marlin@NOSC.ARPA (James E. Harmon) (05/03/85)
------- Tom, I didn't get a good return address so I'll reply to the net. I have had the same problem with both a Kaypro 2 and a Kaypro 4 when they are connected to a Sytek LAN here at NOSC. It skips part of a line at any speed greater than 1200 baud. I have used Kaypro's TERM program, MODEM7, KERMIT, and the NOSC TRANSFER terminal programs on the Kaypros with the same result. 1200 baud works fine for both the Sytek LAN and the Hayes Smartmodem 1200. Good Luck, Jim Harmon (harmonj@NOSC) -------
hugh@hcrvx1.UUCP (Hugh Redelmeier) (05/06/85)
>I have had the same problem with both a Kaypro 2 and a Kaypro 4 when they >are connected to a Sytek LAN here at NOSC. It skips part of a line at >any speed greater than 1200 baud. I have used Kaypro's TERM program, >MODEM7, KERMIT, and the NOSC TRANSFER terminal programs on the Kaypros >with the same result. The Kaypro does scrolling by moving all the characters in the video RAM up one line (using a Z80 block move instruction). This takes a long time. The solution is to use a program that can accept input from the host while the scrolling is being done. This is not trivial because it requires an interrupt handler that bypasses the BIOS. It might be necessary to have XON/XOFF handshaking too. I wrote such a program and use it regularly on my Kaypro II (talking at 9600 Baud to my UNIX machine). Micro Cornucopia also has one on a public-domain disk (and much other stuff of interest to Kaypro hacks).