Les Railton's (Phipscube) Super A1200 Part 5

and so onto part 5 of this incredible build :)

Here's a few more bits and bobs i've been up to with this mad beast: - I put some more space between the USB ports: -

I made the Delfina output ports a little neater: -

Here it is in the system: -

It fits in quite nicely! And now here is the startings of my home made Auto Video Switcher: -

Its an LT1675 specially made for such switching. It takes in the RGB signals from both sources (Indivision and BVision) and with either a logic 0 or 1 on pin 10 it switches the inputs. This ties in with a CD4053 controlling the H and V sync signals. this IC runs in +5V and -5V so the CD4053 has to be powered likewise to match. I have to go under the scope to solder this little beaut: -

These are the wires I chose to solder to the Chip, some old 80 way IDE cable, i've stripped them carefully and tinned them: -

They line up well: -

And now soldered on, this took some doing actually! Almost as hard as my BV repair! : -

Now its ready to have the small wires soldered to the socket: -

Done! : -

Now I needed to weigh up where the Indi and BV plug in. Heres the Indi wire now cut from its VGA cable and I replaced it with a 10 pin IDC. I chose Grey: -

To make sure I had a way to check the signals directly, I soldered the old VGA plug to a 10 pin socket: -

This will be used for checking the signals many times whilst testing my CCT

Here I have made a completely new cable for the BV, I chose black for its plug and also inverted the socket so that there is no way I can get the two mixed up. The pinouts for the BV and Indi ARE different. Same plug doesn't mean same pin layout.

If anyone is interested here are the pinouts for the Indivision to VGA: - Ribbon - VGA Plug 1 - > 1 (Red) 2 - > 6 (Red GND) 3 - > 2 (Green) 4 - > 7 (Green GND) 5 - > 3 (Blue) 6 - > 8 (Blue GND) 7 - > 5 (GND) 8 - > 13 (H Sync) 9 - > 14 (V Sync) 10 - > 4 (Monitor ID) And the pinout for BV : - Ribbon - VGA Plug 1 - > 1 (Red) 2 - > 6,7,8 (all GND) 3 - > 2 (Green) 4 - > 6,7,8 (all GND) 5 - > 3 (Blue) 6 - > N/C (Don't connect this pin) 7 - > 13 (H Sync) 8 - > N/C (Don't connect this pin) 9 - > 14 (V Sync) 10 - > 5, 10 (GND, connected with 6,7,8 ) Ok, on with the show, here's what the floppy drive looks like over the cables, I made an intentional kink in the BV wire so its not resting on the Heatsink: -

Angle shot: -

And here is the AVS all wired up and finished!

It takes +5V in and this is inverted with a DC converter, this is fed to the CD and the LT. The Transistor is used to switch the signal logic from pin 13 of the parallel port all the signals are tied to 75 ohm resistors, but the output from the LT has 33 ohm in series to bring the amplification down (otherwise the screen is too bright): -

Side view to see the labelling on the ports.. just incase

Here is the underneath, it turned out a little messy, but its ok, it all fits in nice. I soldered ground lines directly to the board, then wired everything else over these: -

Sat in its new home: -

Closer look, can you see that grey wire trailing off the left?...

It goes here (Pin 13 of the parallel port): -

A wide shot just to see how mental this 1200 has become! :-

All the info I used to make this AVS is available here: - http://mitglied.multimania.de/camiga/index_e.html Here's a more detailed thread link on how to obtain the parts for this AVS as well as a zip of files to use in aid of making one of these. Included is a slightly modified schematic so this can be built with pin friendliness towards Indivision AGA and also is better for output to LCD monitors. (The original design by Christian is designed for CRT really) http://www.amibay.com/showthread.php?t=13932 I also want to thank Christian personally for his awesome help over email whilst making this, cheers! so whats to come? Well I got some of these :-

So will soon have my own 3.9 ROMs And I also want to make an audio mixer, Get a decent monitor, and a few other last bits and bobs before I try and start from scratch with WB 3.1... Thanks for looking!

phew!!! what an update, stay tuned for installment 6 coming to a screen near you soon!!! :)