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|Author:||wentworth [ Tue Oct 20, 2009 12:09 pm ]|
|Post subject:||target computer|
Hi - now I have found the EASy68K, a project I have been planning based on a 68000 based single board computer can proceed.
What I am now wondering is there a single board 68000 based computer that has on on-board monitor to allow the download of S-format files?
was wondering what are my choices - I don't fancy doing another wire-wrap system
I did spot this board, this kind of thing is what I'm after
http://www.flite.co.uk/flite-flt-68k-68 ... system.htm
any others out there?
|Author:||wentworth [ Thu Nov 19, 2009 5:52 pm ]|
Well I got lucky on e-bay UK and picked this up for Â£30 inc postage - Bargin, still in the wrapper when it arrived.
Has lots of I/O experiments on the board even a ROM writter, printer, 3 color dot-matrix, & some switches.
CPU Motorola MC68000 (8,10,16 MHz)
Main RAM 64 KB (62256 x 2)
Monitor ROM 64 KB (27256 x 2)
Display Unit Personal Computer
I/O Port 1 PI/T (68230), 8255A
I/O Port 2 Printer
Serial Port RS-232C (6850 x 2)
System Clock 8 MHz
DOT Matrix LED 8 x 8 (3color)
Text Tool 28pin x 1
ROM Writer 2764 ~ 27512
System Bus Indicator LED(3Ã˜) x 12
Operation System Software 68000 Assembler
Support Memory System Personal Computer
Expansion Connector System Bus 40pin x 2
External Interface 20pin x 1
Board Size (mm) 270 x 210
See that short ribbon cable on the board, unplug that and the onboard PI/T 68230 I/O ports can be taken off to real-world devices etc. I'm going to add a modem so I can dial-up my application and control/interrogate it remotely.....
The next few months should be fun developing my 68K application using EASy68k, then download the S-record code onto my new toy.
|Author:||profkelly [ Thu Nov 19, 2009 8:25 pm ]|
You can use the Dumb Terminal program from the example page to connect to your real 68K
|Author:||lee [ Fri Nov 20, 2009 12:10 am ]|
One of the first things I would do is write a new BIOS that replicates as many of the EASy68K TRAP #15 calls as possible. It will make developing code for it much easier.
Did you get documents, schematics and a monitor listing with it?
|Author:||wentworth [ Fri Nov 20, 2009 5:45 pm ]|
The kit came with all the documentation, and software, have the board schematics, circuit diagrams, pin-outs, etc ... The PC software has a terminal comms program (like dumbterminal) to accesses the onboard monitor it can also download Motorola S-format files - obviously I can then burn a new set of ROMS for the board.
The monitor provided is documented the with all the usual monitor type commands and its own TRAP#14 codes detailed - not as extensive as the EASy68K, but a good chunk of them - unfortunately no source listings for the onboard MIDAS monitor.
Although I did find on the net a 68000 assembler listing for a monitor called "zBug" which could form the basis of a new BIOS and I could re-code for the EASy68K TRAP #15 commands that would indeed make my future project code development simpler to develop ..... and the listing of TUTOR 1.3 ROM program could also help with that task
Trouble is one 68K SBC may not be enough for what I have in mind.
|Author:||lee [ Sat Nov 21, 2009 2:54 am ]|
unfortunately no source listings for the onboard MIDAS monitor
Perhaps then the first thing to do is make a dump of the monitor. Something simple like an ASCII hex dump of it with two characters per byte or even an S record dump if the monitor can do it.
Reverse engineering it shouldn't be too hard, I wouldn't be suprised if not all 64K is used.
|Author:||wentworth [ Mon Nov 23, 2009 7:45 am ]|
True - I have a binary in the form of an assembler listing made up of 100's lines of DC.L commands. Its an Image of the DCODE68K one line disassembler - so I could use that to decode, or even the MIDAS monitor itself has a built in disassembler.
The MIDAS monitor has a "TUTOR>" prompt so its probably based on the original motorola monitor.
Anyway I have had my desk lamp switched on and off using the PI/T a 4.7K resistor and an opto 22 solid state relay .... I was entertained for all of 5 minutes!!!!
What I really want to do is get cracking on writting some FFT and recursive digital filter code. I'll need to implement some floating point code first - until I get a deal on a 68881. There is one on ebay but its > Â£50, so I will wait til a bargin comes along, then I can connect it to my board and then speed up my DSP code .....
|Author:||paulrsm [ Fri Nov 27, 2009 4:11 am ]|
Are you looking for the Motorola Tutor source code? There is a version for the EASy68K posted in the Examples area. You can find information about the Motorola Educational Computer Board (which uses Tutor) at http://www.easy68k.com/paulrsm/mecb/mecb.htm.
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