Author Topic: Elektor EC-6809  (Read 894 times)

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Offline Wawavoun

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Elektor EC-6809
« on: July 24, 2021, 03:38:40 pm »
Hello there !

I try to run again Flex09 and of course first of all I must build a computer 6809 based for that.

My first choice is the Elektor system named EC-68 or sometime EC-6809 published in "Elektor Computing 3" in 1985 and in french in october 1986 number.

I need two things :

- on side of the ext pcb (video + floppy interface) was not given. If anybody has a good picture ? But nevertheless this can be solved because in put the pcb again in Kicad so... Routing will be different but if there is no other choice !

- More important : this system require two 2716 and one 2732 eproms (Elektor ref ESS540, 541 and 542). This is boot prom, assist09 and character generator. The fist one is really a problem. Assist09 is on the internet so... and the character generator eprom is probably the same that the one in the Junior Computer VDU board which I have.

Many thanks to anybody which will give any information about that.

If there is somewhere another design able to do the same (run Flex09 from real floppy) I will also be interested !

Regards.
Philippe
« Last Edit: July 24, 2021, 04:36:59 pm by Wawavoun »
 

Offline Wawavoun

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Re: Elektor EC-6809
« Reply #1 on: October 21, 2021, 09:11:35 am »
Hello,

Some news from this project :

The two boards are manufactured and tested.
The CPU board is working with a modified Assist09 monitor.
The interface board video part is working with a modified character generator coming from the Junior Computer. The floppy interface part have not been tested yet.

I renew my call for any information about the ESS-540 and ESS-541 eprom (dump, listing, asm source..., whatever you have).
If anybody have this system or can help in this topic please take contact !

Regards.
Philippe
 
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Offline granzeier

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Re: Elektor EC-6809
« Reply #2 on: October 22, 2021, 12:05:15 pm »
Those boards look well done. It looks like it will be a nice system.

You say that you are missing the boot EPROM, but the pictures show that your system is running. What are you using to boot? Are you just using a generic boot, or are you getting the system up some other way?
 

Offline Wawavoun

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  • Country: fr
Re: Elektor EC-6809
« Reply #3 on: October 22, 2021, 12:26:18 pm »
Re,

Yes thats need some clarifications.

The eprom which really do the boot is called "monitor rom" by Elektor in the article (ref ESS-540).
At this place I have a modified assit09 monitor, so my system boot.

What they call "boot rom" ESS-541 is a collection of subroutines doing various jobs related to the // keyboard, the floppy interface and the video.

This name probably come because one these subroutine boot Flex from the floppy.
This eprom is the one that really miss to get a full working system...

Regards.
Philippe
 
 

Offline granzeier

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Re: Elektor EC-6809
« Reply #4 on: October 22, 2021, 02:38:44 pm »
I see, thanks.

I have several Elektor/Elector (USA, UK, India) and have been looking to see if I can find any more info about this, but nothing yet. I'll keep looking.
 


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