Forums

Sega Master System / Mark III / Game Gear
SG-1000 / SC-3000 / SF-7000 / OMV
Home - Forums - Games - Scans - Maps - Cheats - Credits
Music - Videos - Development - Hacks - Translations - Homebrew

View topic - Sega Keyboard (SK-1100)

Reply to topic
Author Message
  • Joined: 05 Nov 2014
  • Posts: 263
  • Location: Auckland - NZ
Reply with quote
Sega Keyboard (SK-1100)
Post Posted: Fri Sep 20, 2019 12:30 am
Just for reference here are some photos of the SK-1100, which may be useful one day to some one.

More info can be found here

http://www43.tok2.com/home/cmpslv/Mark3/Sk1100.htm

Ive also attached the relevant circuit diagrams from above for reference too, just in case.

There is also a discussion below about the keyboard and detection of it.

http://www.smspower.org/forums/17648-SG1000PortDEWriteReadAtBootPattern

Interestingly the cable pins are bridged from top to bottom. Even though only one half of the pins are used on the expansion port, the contacts can be on either side of the expansion port and it will still operate.
1.jpg (289.64 KB)
1.jpg
2.jpg (184.35 KB)
2.jpg
3.jpg (269.79 KB)
3.jpg
4.jpg (243.74 KB)
4.jpg
5.jpg (312.45 KB)
5.jpg
6.jpg (238.28 KB)
6.jpg
7.jpg (466.92 KB)
7.jpg
8.jpg (349.92 KB)
8.jpg
9.jpg (359.31 KB)
9.jpg
10.jpg (213.98 KB)
10.jpg
11.jpg (299.63 KB)
11.jpg
Sk1100.png (12.16 KB)
Sk1100.png
Keymatrix.png (4.06 KB)
Keymatrix.png

  View user's profile Send private message
  • Joined: 05 Nov 2014
  • Posts: 263
  • Location: Auckland - NZ
Reply with quote
Post Posted: Fri Sep 20, 2019 1:25 am
Interestingly enough it looks like the rubber key membranes and the matrix contact board are probably the same as used in the SC-3000 ones. The only difference i can see is the power LED is not fitted and the reset key is removed. Im not sure if that key was a separate molding all together as it was yellow, or if it was just printed yellow at the same time as the key text.
  View user's profile Send private message
  • Joined: 28 Sep 1999
  • Posts: 1143
Reply with quote
Post Posted: Fri Sep 20, 2019 3:39 am
This is great stuff, I've never seen inside the keyboard before. Really looks just like the SC-3000 internals. Somehow I missed that it supported the tape interface too, that's a lot of value.

I wonder if we'll see a USB or PS/2 keyboard adapter in the future? :)
  View user's profile Send private message Visit poster's website
  • Joined: 05 Nov 2014
  • Posts: 263
  • Location: Auckland - NZ
Reply with quote
Post Posted: Fri Sep 20, 2019 4:26 am
Charles MacDonald wrote
I wonder if we'll see a USB or PS/2 keyboard adapter in the future? :)


I was wondering about attempting a PC keyboard for a laugh too. I guess the lazy way would be to use a micro to read a PS/2 keyboard and output that into a x / y grid that matches the sega keyboard, then feed that into the PPI chip.
  View user's profile Send private message
  • Joined: 05 Nov 2014
  • Posts: 263
  • Location: Auckland - NZ
Reply with quote
Post Posted: Tue Sep 24, 2019 12:36 pm
I started having a play with doing this from a ps/2 keyboard tonight. It might not be too difficult. I can read a keyboard in with a micro, which is half way there. Juat need to impliment a bunch of logic to drive the x/y grid and come up with a lookup table to tie it all together.

Is there merit to having support for the tape interface? I did a little bit of looking around and it seems fairly simple. Need to do a bit more reaearch with a scope to figure out exactly what goes on there tho.

The printer port probably has no real use, so might just leave that out.
  View user's profile Send private message
Reply to topic



Back to the top of this page

Back to SMS Power!