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Netronics ASCII keyboard and Video Board questions

RizThomas

Experienced Member
Joined
Jan 2, 2012
Messages
195
Location
Surrey,BC,Canada
Apologies for cross-posting. I finally had my hands on this Netronics products ( got it for a fair price few years ago with Explorer/85). After re-soldering ( and IPA+cleaning) all points on the PCB and replacing caps, I got the the Video board working. I also re-did the solders ( and replace the ribbon cable and ic socket) on the ASCII keyboard to get it to work with the Video board. However, I have some puzzling questions about the keyboard. I re-checked all jumper settings according to the manual but...
1. When typing, some keys shows the characters on the screen. However, it sometimes does not. Only when I hit this ?key ( installed by original owner) in combination with the ASCII key that I can make it show up in the screen. There is no explanation ( that I found why so) from any source yet.
2. Repitious characters depending on how fast I hit the key....like I have de-bounce problems.
3. There is area for an extra chip +.. that was not mentioned in the manual nor shown in the schematic.

Anyway... the ?key is on J6 ( normally open) and the unpopulated parts area is near P1 ( ribbon cable)
Would anyone has a tip for me is much appreciated.
Oops... I have to upload my pictures from my computer ( on Ipad right now).


 
Last edited:

DeltaDon

Veteran Member
Joined
Oct 26, 2016
Messages
604
Location
Dutchess County, New York, USA
I dug out the keyboard I've used with a Netronics terminal board thinking it was the same keyboard as what you were asking for info on. However, other than using a ribbon cable to the terminal is is completely different. Looking for a description or maker on it and discovered it is a Jameco JE610 ASCII keyboard dated 1979. So sorry, can't help out.
 

Telcontar

Member
Joined
Jan 3, 2019
Messages
12
Location
United Kingdom
Curious … Netronics tended to use Stackpole switches, and I was just the other day trying to find documentation for their ELF II keyboard in the hope of getting the switch series name or part number, but I could not even find assembly instructions (maybe it always came pre-assembled).

From what I can tell, you don’t have Stackpole switches though. Possibly George Risk KBM AKA Futaba MD, from what little I can make out. The weird switch tacked on at the back looks like a European-made Clare high-profile reed (not the same as the Clare-Pendar version made in North America).

And in case it’s still broken: is there a link anywhere to the specific schematics of that model? The debounce time was sometimes controlled by a resistor and capacitor, wired into the encoder. And is the encoder chip the one that the schematics say it should be?
 

MauriceH

Experienced Member
Joined
Apr 2, 2014
Messages
378
Location
Dordrecht , Netherlands
RizThomas,
I am working on the same Boards at the moment, but those are somewhat scrapped.
So far missing components are back, But I mis the MK2709 Char ROM.
Do you have an image or BIN,HEX-File of that ROM-U24?
Would be great,

Thanks,
Maurice
20210424_VideoDispayBoard-001.jpg
20210424_Keaboard-001.jpg
 

RizThomas

Experienced Member
Joined
Jan 2, 2012
Messages
195
Location
Surrey,BC,Canada
Sorry for being late..just read my notification just now. I have the chip but needs to find a way to read it. I have to find its equivalent in 27xxx type.
 
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