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Re: CB030, A 68030 SBC for hobbyists [message #10266 is a reply to message #10132] Tue, 14 March 2023 11:50 Go to previous messageGo to previous message
computerdoc is currently offline  computerdoc
Messages: 130
Registered: October 2015
Senior Member

Hi Mike!
I downloaded OS9 68K from your github repository a few minutes ago. I intend to port it to the Tiny68K. Changing '030 to '000 or '010 sounds easy. What I don't yet know how to do is write a tick timer. Back porting the CPLD tick timer from the CB030 sounds doable. How different is the Tiny68K tick timer from the CB030 tick timer?
I'm excited to eventually get a CB030 board! I can almost taste it! Bill, please put me on your list for the 4 layer version of your CB030 board when it is ready!
Is there anything else I need to know to port this thing over to the Tiny68K / MB012?
I feel fun times ahead! Smile
Oh, by the way, any OS9 68K help you need, let me know. I don't know 68K assembler as of yet, but I'm sure I'm going to find out! I'm sure the loud yell while pulling out hair is coming too I expect. I come from a 6809 background from the days when the Cocos were new! I still remember buying OS/9 v01.00.00 for my Coco 1 F board! Those were great times! Some pointers are always welcome. <big grin>
I'm running Linux Mint on my HP mobile server laptop and if memory serves I have already successfully compiled the OS9 68K rom image a year or two ago. I just didn't have a clue where to go from there. I noticed that your Github repository for OS9 68K is only a few hundred kilobytes so I expect it is just the source code for the rom image?
I have also downloaded the OS9 68K v1.2 sdk from the link Bill provided. I'll be trying my hand at compiling your updates to OS9 68K.
Roger Hanscom has designed and built several iterations of a 68000 SBC with 1MB of flash eeproms and 2MB of SRAM with 2 serial ports, a 68681 I/O port, 2 16-bit parallel ports if memory serves as well as a CF card interface using an 8255 and another drive interface with just 5 pins, but I don't remember the name of the drive. I'm sure I'm leaving something else or 2 out, but I'm writing this from memory as I have built several of them. I would love to see OS9 68K running on these boards as well.
Now that my Dell Poweredge servers are basically completed, I'll have more time to build some more 68K SBCs and run OS9 68K on them. CP/M 68K is currently running on my Tiny68K, but I don't know much about CP/M of any flavor. I cut my computer OS teeth very early on with OS/9 6809 version and there was a long steep learning curve. It was definitely worth learning though. I have never forgotten how I used OS/9 to use my ASR-33 Teletype to print something for the very first time! The Coco didn't output LFs to the serial port! Ugh!
Kip


Kip Koon
computerdoc at sc dot rr dot com
http://www.cocopedia.com/wiki/index.php/User:Computerdoc
 
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