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- Path: sparky!uunet!portal!cup.portal.com!Dan_E_Babcock
- From: Dan_E_Babcock@cup.portal.com
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: How to access individual bits of a CIA
- Message-ID: <69573@cup.portal.com>
- Date: Sun, 15 Nov 92 14:13:41 PST
- Organization: The Portal System (TM)
- References: <Bxo42p.AGu@usenet.ucs.indiana.edu> <69502@cup.portal.com>
- <BxqxLu.682@usenet.ucs.indiana.edu>
- Lines: 10
-
- >I have the manual. It doesn't tell me what I need to know, and neither
- ...
- >Specifically, I want to know how to directly access DRDY* and ACK*.
-
- You can't. DRDY is generated automatically when you write to the port. (See
- the timing diagram). You can't poll ACK directly, but a negative transition
- will set the FLAG bit (which can cause an interrupt or may be polled). This
- is very clearly described in the "Handshaking" paragraph.
-
- Dan
-