Another Type 30 Display Reproduction At 36% Scale

[MICHAEL GARDI]

I just published this new project over on Hackaday.  I still have to add some photos to the Instructions but the 3D model files are all there.  Once printed it should only take 10-15 minutes to assemble with only 6 bolts and some locking tabs. Super simple.

Since I had the actual measurements from the Computer History Museum I did a full case at 36% scale with the Waveshare 5 inch round display. Seen above running my connected lines demo. 

Mike

[Glenn Babecki]

Mike,

That looks great with the full case, even though it's mostly empty.  It provides the symmetry to the front face rather than a truncated look.

I haven't checked out the Hackaday details, but curious how the 5 inch display works out for viewing.

--
You received this message because you are subscribed to the Google Groups "[PiDP-1]" group.
To unsubscribe from this group and stop receiving emails from it, send an email to pidp-1+un...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/pidp-1/5b944494-be0d-466f-9ea1-48965ed61a8an%40googlegroups.com.

[Bill E]

Great job! I'm very tempted to make one, even though I added a 7" display to the PTP panel. I agree, 5" is pretty much the minimum useful display size.

Now I'd just like the Type 30 emulator sw to use the 2nd HDMI port so I can leave my other panel connected. It's very useful for loading tapes, etc.

Or, is this something that can be done now?

Bill

[Whit Turner]

Very well done! I think you have hit the sweet spot for scaling with the 5" round display.

Have you thought about simulating the light pen - perhaps by using the touch screen interface to provide position information to software?

Whit

[MICHAEL GARDI]

Interesting idea Whit. From the PDP-1 Handbook:

It looks like the light pen had a photodiode that would trigger if a "dot" was just plotted at the point the pen was touching on the screen.  This would trigger the Light Pen status bit to be set to one.  So it would have been the programmers responsibility to draw dots across the screen in a "CRT scanline fashion" waiting for the Light Pen bit to be set then saving off the X (AC) and Y (I0) coordinates when detected.

The right way to do this would be to make a functional light pen and wire it into the PiDP-1 hardware.  You could cheat and maybe use the touch screen interface and coordinate that with the virtual display to achieve the same effect. In either case the PiDP-1 team would have to change the software.

Oscar, Angelo have you considered doing something like this?

Mike

[Matthias Barthel]

I'am working on a backplane were you can connect every hardware you want, when the backplane works we can develop a lightpen for the pidp1 👍

Matthias 

--

You received this message because you are subscribed to the Google Groups "[PiDP-1]" group.
To unsubscribe from this group and stop receiving emails from it, send an email to pidp-1+un...@googlegroups.com.

To view this discussion visit https://groups.google.com/d/msgid/pidp-1/8a2b262e-4a26-464a-ad34-ef9ca0a87257n%40googlegroups.com.

[MICHAEL GARDI]

When you are done the backplane Matthias I volunteer to help out with the light pen. I think that would be pretty cool.

Mike

[Matthias Barthel]

Ok Mike👍  the pcbs are on the way from China to Germany 

To view this discussion visit https://groups.google.com/d/msgid/pidp-1/0e2658e6-47cf-4947-929a-b0b74ff4d05dn%40googlegroups.com.

[Stergios Stergiou]

This scale is nice because the PDP-1 also used another display, the Type 31, which had 12-bit accuracy (4096 x 4096) and 5" size. In a sense, this is a 100% scale replica of the Type 31.