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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!mcsun!news.funet.fi!ajk.tele.fi!funic!nntp.hut.fi!nntp!then
- From: then@vipunen.hut.fi (Tomi H Engdahl)
- Subject: Re: Makeshift PC sound card docs
- In-Reply-To: jtyrkko@vipunen.hut.fi's message of Tue, 1 Sep 1992 07:17:53 GMT
- Message-ID: <THEN.92Sep1204935@vipunen.hut.fi>
- Sender: usenet@nntp.hut.fi (Usenet pseudouser id)
- Nntp-Posting-Host: vipunen.hut.fi
- Organization: Helsinki University of Technology, Finland
- References: <16474@ucdavis.ucdavis.edu> <Aug31.234958.58045@yuma.ACNS.ColoState.EDU>
- <BtvrJC.1Ln@news.cso.uiuc.edu> <1992Sep1.071753.22896@nntp.hut.fi>
- Date: 1 Sep 92 20:49:35
- Lines: 19
-
- In article <1992Sep1.071753.22896@nntp.hut.fi> jtyrkko@vipunen.hut.fi (Juha-Petri Tyrkk|) writes:
-
- > Is it possible to maintain an accurate data output rate through
- >parallel port or even into a memory mapped output port? Can all the
- >interrupts be succesfully turned off? How about DRAM refresh?
-
- It is possible to maintain accurate data output rate using timer chip.
- It is possible to program clock interrupt rate very accurately. You
- can hook your sound routine to that clock interrupt, so you can get
- accurate ouyput rate (at least when other interrupts are disabled).
-
- DRAM refress does not use interrupts. DMA refreash uses DMA (in PC)
- or dedicated circuitry (in AT) for refreshing memory.
-
-
- --
-
- Tomi.Engdahl@hut.fi "Don't force it; get a larger hammer"
- then@vipunen.hut.fi
-