Article View: comp.sys.ibm.pc.misc
Article #12080Re: Bidirectional parallel port
From: David E A Wilson
Date: Sun, 23 Apr 1995 00:00
Date: Sun, 23 Apr 1995 00:00
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FFUHRMANN@MICRON.VAX.COM writes: >This card uses Bit5 as follows: Bit5=1 ==> Read mode, Bit5=0 ==> Write mode That matches what Frank Van Gilluwe lists on page 721 of "The Undocumented PC". >Some of them have a chipset 82C865, 82C863 some use a 16C550 or a 16C522. I have a card with UM82C863F + UM82C865F and they are not bi-directional. Ditto for W86C451 + W86C456. >In the CMOS setup of a motherboard I found a parallel port mode setup. >The following modes are possible AT - PS/2 - ECP - EPP? AT will be a port that ignores bit 5 - ie non bi-directional. PS/2 will probably be bi-directional. EPP changes the function of 5 pins: 1 -Write: output line that signals the data on pins 2-9 is valid 10 -IRQREQ: a low signals an IRQ request if enabled 11 -Wait: Input line indicates remote device is not ready 14 -DataStb: output indicates pins 2-9 have valid data (same as 1????) 17 -AddrStb: when low pins 2-9 are address of device. -- David Wilson Dept CompSci Uni Wollongong Australia david@cs.uow.edu.au
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10d683,e9668c9482117a88 X-Google-Attributes: gid10d683,public X-Google-Thread: 10c6a1,e9668c9482117a88 X-Google-Attributes: gid10c6a1,public X-Google-Thread: f53ba,e9668c9482117a88 X-Google-Attributes: gidf53ba,public X-Google-Thread: f70d1,e9668c9482117a88 X-Google-Attributes: gidf70d1,public X-Google-Thread: 1045b9,e9668c9482117a88 X-Google-Attributes: gid1045b9,public X-Google-Thread: 109e38,e9668c9482117a88 X-Google-Attributes: gid109e38,public X-Google-Thread: 105ed0,e9668c9482117a88 X-Google-Attributes: gid105ed0,public X-Google-Thread: 11196f,e9668c9482117a88 X-Google-Attributes: gid11196f,public From: david@wraith.cs.uow.edu.au (David E A Wilson) Subject: Re: Bidirectional parallel port Date: 1995/04/23 Message-ID: <3nd2jv$sr4@wraith.cs.uow.edu.au> X-Deja-AN: 101358432 references: <3n6f9m$av5@ftp.micron.com> organization: University of Wollongong, NSW, Australia. newsgroups: comp.sys.ibm.pc.misc,comp.sys.ibm.pc.hardware.systems,comp.sys.ibm.pc.hardware.misc,comp.sys.ibm.pc.hardware.comm,comp.sys.ibm.pc.hardware.chips,comp.periphs,aus.computers.ibm-pc,alt.comp.hardware.homebuilt