[TI-H] Re: PICs in general

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[TI-H] Re: PICs in general


Pierre,
	The 86 and 89/92 are similar electrically.  The link port
consists of open collector transistors.  However internally the 89 is a
bit more complex.  For the 86 all you have to do is read and write to a
port on the Z80 and I believe the link port on the 89 is memory
mapped...some one please confirm.  I would suggest writing a quasi I2C
routine.  I say quasi b/c if you know that you will only have one device
to control then you do not have to worry about sending the CHIP ADDRESS.
You should be able to find plenty of info on I2C.  For the MMC expander
that I am working on I will be using an SPI interface since the MMC
cards and I believe a few PICs already support it.  It is different in
that it has uni-directional lines as opposed to bi-directional.

Regards,
Cullen Logan

-----Original Message-----
From: ti-hardware-bounce@lists.ticalc.org
[mailto:ti-hardware-bounce@lists.ticalc.org] On Behalf Of docydoc
Sent: Monday, April 29, 2002 10:42 AM
To: ti-hardware@lists.ticalc.org
Subject: [TI-H] Re: PICs in general


Hi Logan!

I am already familar with the Motorola MC68000 processor.
I#d like to programm also my own send/rec byte routine... Would be nice
if u
can help me a little bit.
Then we can both work on it together (TI86 and TI92 should be similar,
no?)

Pierre



Cullen Logan wrote:

> I started with PICs a few months ago, and honestly you can learn them
in
> a weekend...they are easy and fun.  My first little project was
> connecting the TI-86 to an NES game pad so that games could be played
> with an actual controller.  I have a pretty detailed description of
> everything involved on my website.  http://www.psikan.com
> http://www.psikan.com/nesticalc.php to be more specific.  There is asm
> code there for both the PIC and the TI-86.  I ended up writing my own
> send/recv byte routine for the calc.  I do not really like the built
in
> stuff.  I have two more weeks of school then I will be able to devote
> lots more time to this stuff, and actually I already have code started
> for MMC cards(SM would be better/faster but harder).  This will allow
> for huge amounts of storage, utilizing FAT12 file system, unless I can
> come up with a better one.  Anyone who wants help, please ask and if I
> have time I will try.  Also anyone out there know of PICs that have
SPI
> port and functions built in?  If you are looking for a cheap
alternative
> to buying the Microchip programmer for the PICs look into the WARP-13.
> It supports about every brand of PIC imaginable, and it is only 70
> bucks.  Just google it and you will get some hits.
>
> Regards,
> Cullen Logan
>
> -----Original Message-----
> From: ti-hardware-bounce@lists.ticalc.org
> [mailto:ti-hardware-bounce@lists.ticalc.org] On Behalf Of docydoc
> Sent: Sunday, April 28, 2002 11:58 PM
> To: ti-hardware@lists.ticalc.org
> Subject: [TI-H] Re: PICs in general
>
> Hi!
>
> KiwiCado23@aol.com wrote:
>
> > Does anyone have any advice on where to start learning PIC-craft?
>
> I started with the PicstartPLUS of Microchip itself.
>
> It comes with a complete documentation and the hardware to program
EVERY
> PIC.
>
> The PIC assembly lang is pretty easy. U just have to get used to all
the
> registers and it's function unless u want to use C or similar.
>
> The kit is about $200 as far as I remember. But u get everything u
need
> including the programmer.
>
> Can somebody provide me with assembler routines for the TI92 / TI92+ /
> TI92-II+ for sending a byte
> and receiving a byte tru the link cable (I have the original one by TI
-
> the black one).
>
> Should not be a big problem to add some 74HC573 to expand the PIC and
2
> lines for accessing the TI... Maybe also a serial shift register would
> be useful but it all depends on the ay how a byte is received/sent.
>
> Pierre
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