Hi Stanley, My simple test to see that something is wrong was: - Just 8 bits bus, and simple port 0x330 decoding. - MSDOS and debug.exe - doesn't work.
test 2 - nothing connected and data-line is pulled down with a resistor - verified to be down during read (w/ ocilloscope) - inport returns 0xff on all ports except the ones on board. :-( test 3 since ISA is connected to a bridge, and MSDOS does nothing until you tell him to, ISA datalines have no activity at debug.exe prompt. - nothing connected and data-line is shorted to gnd - inport returns 0xff on all ports except the ones on board. :-( So it is not reading from isa !!! I'm interfacing an FPGA to it and got stuck with this issue. It works with a good old 486 though ;-) Thanks for help. Luis Cupido. ct1dmk. Stanley Reynolds wrote: > > ----- Original Message ---- > From: Luis Cupido <[EMAIL PROTECTED]> > To: [email protected] > Sent: Tuesday, February 26, 2008 6:53:12 AM > Subject: [time-nuts] PC104 isa > > Hi, > > As there are experts here for sure I > risk this off topic question (it is not so > off topic in the application where it is used). > > I have a PC104 from kontron (mops_lcd) that > I can't read IO ports from the ISA bus, The write > to ports is ok but the read gets 0xff always. > (even with datalines forced '0' all the time) > Looks that IO input is comming from elsewhere > as onboard devices like LPT or COM work well > I suspect a bridge config or whatever... > Kontron support doesn't really help and I > wonder if anyone has stepped into this before... > > Thanks and sorry for off topic. > > Luis Cupido. > ct1dmk. > > Sorry no experence, but have you tried more than one I/O add-on board and > which ones ? How about a header Ribbon cable / cables? Do you have only two > boards ? Are you using a 8 bit XT or 16 bit AT board ? How is the I/O board > setup, interrupts,DMA, and memory - I/O address ? > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > ____________________________________________________________________________________ > Looking for last minute shopping deals? > Find them fast with Yahoo! Search. > http://tools.search.yahoo.com/newsearch/category.php?category=shopping > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
