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MacWorks XL ROM serial drivers

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D.Finni:

--- Quote from: stepleton on May 14, 2020, 05:49:17 pm ---Silly question, but do you know your serial ports to be in working condition on your XL?

--- End quote ---
Silly answer: I don't own a Mac XL!  :P But I have two beta testers and they reported that LisaTerminal works, so we're presuming that the cable and port are both working, and it's my software that's at fault.

D.Finni:
The plot thickens! When I changed to using the Printer port, it works at 57600 baud. So this is good news, but still leaves the question unanswered: why not on the Modem port?

D.Finni:
A few days ago I read the Async AppleTalk article in Dr Dobbs October 1987. Source code accompanied the article, and the source says that configuring the Lisa's port A for 19,200 baud can't be done. Another note says that Lisa port B works from Xtal, not PCLK.

So my conclusion is that Lisa's port A can't be configured for high baud rates. Does this ring any bells for anyone?

stepleton:
Yes, I think this is detailed in some of the Workshop manuals. I don't have a page number for the information, but here is a place where I put this knowledge to some use:

https://github.com/stepleton-xx/lisabbs/blob/master/LIBPORT.TEXT#L331

D.Finni:
Well there we go. It looks like my problem was trying to configure too high of a baud rate for the serial port. Thanks for the link.

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