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Re: Question ISA BUS clock [message #6198 is a reply to message #6191]

Sun, 31 March 2019 12:51

Andrew B
Messages: 467
Registered: October 2015
Location: Near Redmond, WA

Senior Member
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AEN only gets used during a DMA transfer, so unless there is such a transfer going on, you won't see it change. My understanding is that the use of DMA was pretty uncommon on the original 5150 PC/XT systems, even though the controller was there.

ALE is used to tell the card to latch it's address bus, so that will be used on pretty much any cycle.

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[Message index]

		Question ISA BUS clock By: 32768 on Fri, 29 March 2019 00:20
		Re: Question ISA BUS clock By: monahan on Sat, 30 March 2019 08:15
		Re: Question ISA BUS clock By: 32768 on Sun, 31 March 2019 08:46
		Re: Question ISA BUS clock By: Andrew B on Sun, 31 March 2019 12:51
		Re: Question ISA BUS clock By: Sergey on Mon, 01 April 2019 12:01
		Re: Question ISA BUS clock By: 32768 on Tue, 02 April 2019 00:07
		Re: Question ISA BUS clock By: Sergey on Tue, 02 April 2019 01:31
		Re: Question ISA BUS clock By: 32768 on Sun, 07 April 2019 22:48
		Re: Question ISA BUS clock By: Sergey on Mon, 08 April 2019 16:33

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