xbrown@sheoak.bcae (Andrew Brown) (04/16/91)
gidday,
I have just bought an ibm compatible AT (286-16) and would
like to connect it up to my amiga 500 via the centronics port.
Something like laplink is what I need however the laplink cable
seems to use _STRANGE_ pin connections (which would probably
cause clouds of smoke to emit from my ibm as the amiga supplies
+5v on pin 14? I think it's that one). What I need is books,
advice, source code, possible pin connections, etc.
Thanks is advance.
Andrew Brown | I know you believe you understand
maddog@ironbark.bcae.oz.au | what you think I said but I'm not
xbrown@sheoak.bcae.oz.au | sure you realise that what you heard
731114@sheoak.bcae.oz.au | is not what you think I mean't. d89-zke@dront.nada.kth.se (Zoltan Kelemen) (04/17/91)
I've done something similar when writing a transfer program for my good old Commodore 64. The problem is, that most PCs are not able to receive data using the normal data port (03bc or 0378 or 0278), only PS/2 systems can do that. Printer data register, port 03bc / 0378 / 0278: bit 7 = data bit 7, pin 9 bit 6 = data bit 6, pin 8 bit 5 = data bit 5, pin 7 bit 4 = data bit 4, pin 6 bit 3 = data bit 3, pin 5 bit 2 = data bit 2, pin 4 bit 1 = data bit 1, pin 3 bit 0 = data bit 0, pin 2 Printer status register, port 03bd / 0379 / 0279: bit 7 = busy, pin 11 bit 6 = acknowledege, pin 10 bit 5 = out of paper, pin 12 bit 4 = online, pin 13 bit 3 = error, pin 15 bit 2 = unused bit 1 = unused bit 0 = unused Printer control register, port 03be / 037a / 027a: bit 7 = unused bit 6 = unused bit 5 = unused bit 4 = enable IRQ7 for printer acknowledge bit 3 = select input, pin 17 ; inverted bit 2 = initialize printer, pin 16 bit 1 = auto linefeed, pin 14 ; inverted bit 0 = strobe, pin 1 ; inverted Now, the printer data register may be used for output, and on PS/2 systems also for input. The printer status register may only be used for input. The printer control register may be used for both input/output on all PC systems. When waiting for input, you have to ensure that none of the output lines are pulled to ground. If an output line IS pulled to ground, no input is accepted on that line. For example, before inputting from the printer control register, you have to output value 00000100 binary, or 4 decimal. Hope this will help you a bit. Zoltan Kelemen d89-zke@nada.kth.se