Cool project. Have a Junior in real and the successors. But as other slaready mentioned, I could not test the software, as I do not have Windows. With graphic UI MacOS would be preferred for me.

Any updates regarding the EC65 computer ?

I used the PCB's of the EC65 for a DOS65 system which is working great... Three of the four PCB's are used for this DOS65 system. The fourth card is a new floppy card based on a 1793 disc drive controller.. On this DOS65 I have a C-compiler up and running ...

Hello All

Yesterday I managed to boot my Junior DOS with an OS65D image for "HxC Floppy Emulator". The emulator is much more stable compared to real drives.. But I'm not able to perform any write actions with the HxC Emulator.


Do you have the original images used for Junior or EC65 (or SAMSON ...

Hello Tanteju…

I have a working EC65 system at home.. With CPUcard, new VDU card built, RAM card and floppy card. On my Junior DOS system I'm able to boot OS65D. Not using the floppy drives anymore but a HxC floppy Emulator (but writing actions does not work). Next step is to modify the OS65D disc ...

Many years ago, I had a defective backplane which had prevented a computer from working for good.
But I wasn't aware from the start, that the problem had been caused by the backplane.

Does your backplane look like this ?

backplane.png

If yes, plug the PCBs into a new backplane, and see what ...

Hi, tanteju.

In addition Phi2 is so weak, that timing measurement, even with high impedance probe, is not possible. As soon as the probe is attached to Phi2 on the bus, VDU card stops working completely.
On the EC65 CPU card, the PHI2 signal for the bus is generated by pin8\N70\IC20\74LS05_or ...

1. Several strange effects are a result of something broken in the electronics. I assume, it is a capacitor, but I could not find it so far. Result is that read/write to RAM card does sometimes not work properly. CPU, VIAs, Bus drivers on CPU card already changed, with no effect. Hi, tanteju. You ...

Thanks for sharing your efforts! Nice monitor: smart VDU output, facilities for Basic, simple monitor with disassembler, ability to boot from floppy.

I found this, which might be one of several articles on EC65:
https://archive.org/details/kim1_De_uP_Kenner.61/page/n27
"De uP Kenner.61" April 1989 ...

Please do share links to any findings.

I found this post elsewhere by hoglet:
https://stardot.org.uk/forums/viewtopic.php?p=88889#p88889

No links to share, but a lot of findings:
1. Several strange effects are a result of something broken in the electronics. I assume, it is a capacitor, but I ...

Sorry, no suitable findings for that "Siemens SMP norm".

It is most likely just one out of a million possible pin assignments for these DIN 41612 (now IEC 60603-2) connectors that were used frequently those days (especially in industrial solutions, Eurocard size boards).


If my memory is not ...

Found an old commented disassembly of OS65D 3.0. If nothing else works, I will have to use that.

But still looking for proper disassembly of the EC65 monitor EPROM. Could not find anything so far.

Pretty old thread, but the question is still around. Did anyone manage to get a working set of the modified OS65D discs? I found a commented disassembly of the OS65D 3.0 for either Junior or EC65 between old papers.

Thank you for the warm welcome.

Welcome, tanteju. :) Which option to you intend to pursue? If you intend to try to get the floppies working again then it'd be helpful to provide more detail. Do the drive motors turn? Is there an error message that appears? Can you confirm that all power supply ...

Hello,

In my first post to this forum I'm asking for some help and data :-)

In a mood of nostalgia I have brought my old EC65 (Octopus 65, Samson 65) to live. Or more or less.
The computer itself works. It's just the floppy disks (OS65D) worked first. That was a surprise, considering the 35 years ...