All my DOS application can't do is toggle 2 pins of the par-port. No interupts. dosemu-1.1.99 as root, won't do it, even with editing dosemu.conf to: $_ports { device /dev/lp1 fast range 0x378 0x37f } # lpt1 and other combinations
Under DOS these are the correct port addresses. Has any body ever done this ?
== Chris Glur.
It appears that DOSEMU has BIG problems when one wants to do this sort of thing and nobody quite seems to know why. Some time ago, I posted a similar problem about a DOS program that I had which writes characters to a serial port and then has to toggle the RTS line (within 50 milliseconds of the last bit of the last character going out of the TX shifter) so that the reply can come back - the RS232 interfaces to a half-duplex RS485, hence the RTS controls direction, send or receive.
I find that I can write the characters in my program when running under DOSEMU 1.1.99 and they do eventually come out of the socket round the back of the PC but there's no telling when. That makes it impossible to know when to toggle RTS, since reading the correct status bit (presumably emulated by DOSEMU, not the REAL bit in the UART) to see when the shifter's empty is obviously NOT related to the timing of the actual characters coming out of the hardware.
I, like you, have tried all sorts of permutations of using $_ports, etc., but to no avail. If you ever find a solution, I'd be delighted to hear it. Last time I asked about this on the mailing list, the response I got was, "What's RTS?".... That wasn't from Bart, by the way. He seems to have answers for most things. Not for this, though!
Cheers,
Gerald.
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