Ken:

That is exactly the kind of information I am looking for.  I am using QBASIC
because I a fairly familiar with writing code.  However, I have never
written any real-time code.
The PC has a bidirectional LPT1.

I have some free running A/D outputs that are 16-bits wide parallel data
with some control signals.  I want to capture the data, massage it and
output an algorithm  to a D/A and a LCD Display.  The data stream is not
very fast (Kbytes/sec).  I would use C if I could find a good CD ROM or
beginner's self study book to learn it.   I am in the process of learning
PIC assembly.  It seems to be fairly straight forward and easy to grasp.  I
do not have MPLAB yet so I am still at the theoretical stage. That is, no
real verification that the programs will work.

I have been in an administrative position for many years and delegated the
software design to others.  I was pretty competent at assembly and Intel
Basic for the MCS51 series microcontrollers but I became pretty rusty over
time.

My business collapsed due to international circumstances and wiped me out
financially.  So now I have to wear all the hats if I am going to survive
and I am starting with what I think I can grasp most quickly.

I am much more effective in hardware design, especially analog, high voltage
and power applications and RF. But I need to learn C, PIC assembly and in
general become more efficient in software development.  I have many designs
in the works.
Thank you for your interest.

Regards,
Richard

----- Original Message -----
From: "Ken Pergola" <no_spam@LOCALNET.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, September 17, 2003 12:26 AM
Subject: Re: [EE] QBASIC QUESTION


> Hi Richard,
>
> For the parallel port, use the INP() and OUT() commands.
> To find your port addresses, invoke debug and type: d 40:0 <enter>
>
> You'll get something like:
>
> -d 40:0  <=== this is what you typed in at the debug prompt
>
> 0040:0000  F8 03 F8 02 E8 03 E8 02-BC 03 78 03 78 02 C0 9F
> ..........x.x...
>
>
> You'll see that on my computer my port addresses are as follows:
>         COM1 = 0x3F8
>         COM2 = 0x2F8
>         COM3 = 0x3E8
>         COM4 = 0x2E8
>
>         LPT1 = 0x3BC (base address)
>         LPT2 = 0x378 (base address)
>         LPT3 = 0x278 (base address)
>
>       (you can't assume, for example, that LPT1 will
>        always translate to a 0x3BC -- always check with
>        debug on any machine you will use)
>
>
>
> On the parallel port:
>         Data register = base address
>         Status register = base address + 1
>         Control register = base address + 2
>
>
>
>
>
>         ' This is *no*t code that should be executed in order, these are
just code
> snippets:
>
>         ' Upon start-up, cache the control register into a global variable
>        ControlByte = INP(ControlReg)
>
>        ' Force parallel port data bus to OUTPUT mode
>        ControlByte = (ControlByte And 223)
>          OUT ControlReg, ControlByte
>
>        ' Force parallel port data bus to INPUT mode
>        ControlByte = (ControlByte Or 32)
>          OUT ControlReg, ControlByte
>
>
>          ' Read the parallel port's data bus
>          DataByte = INP(DataReg)
>
>
>          ' Write to the parallel port's data bus
>          OUT DataReg, DataByte
>
>
>
> May I ask a few questions?
>
> 1) Do you have to use QBASIC? I'm just curious why you want to do this in
> QBASIC. Would you consider another language?
>
> 2) Do you have a bidirectional parallel port installed on the computer? If
> so, do you know it's address?
>
> 3) Could you give more details on exactly what you are trying to
accomplish
> (the overall picture)?
>
> Hope this gives you a start, but please chime in to provide some more
> specifics since there's more than one way to skin a cat. As for the serial
> port, there should be QBASIC documentation for this.
>
>
> Best regards,
>
> Ken Pergola
>
>
>
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Richard Graziano
> Sent: Tuesday, September 16, 2003 11:03 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE] QBASIC QUESTION
>
>
> Does anyone know how to write a QBASIC command to transfer a byte or
> multiple sequence of bytes to the parallel port of a PC,  and also to read
a
> byte or multiple sequence of bytes from the parallel port?  Also, the same
> question applies to the serial port.  I would appreciate any information
on
> this software question.
>
> Regards,
> Richard
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body