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Post Options Post Options   Thanks (3) Thanks(3)   Quote Macro Quote  Post ReplyReply Direct Link To This Post Topic: Taito TC0070RGB Replacement
    Posted: 30 Oct 2013 at 9:01pm
Several Taito boards have a hybrid used to do 3 x 6 bit digital to analogue conversion for the video output stage.

These are not easy to fix, and it seems very good at falling off of boards (especially when stored loose)

I started working out what it could be replaced with, and knocked up a design for a simple resistor ladder version, using GAL's for the blanking logic

Jrok then pulled one apart and stuck the original circuit on the web. (copied below)

from the two designs, I then put together a possible PCB in eagle, and this has been sent off to be fabricated to test the design - if all OK, then I can get some more made and provide PCB's or kits of parts. Just waiting for the postman, and then I can make one up and start writing some PAL code to reproduce the circuit.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Alpha1 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2013 at 10:13am
Nice!
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Post Options Post Options   Thanks (2) Thanks(2)   Quote Macro Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2013 at 12:00am
Finally had some spare time, so populated the first board ready for testing

Lessons so far ...

If you put pads for mini resistors, make sure that you buy the right size

oh well, doesn't really matter, since the transistors are that tall anyway


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Post Options Post Options   Thanks (0) Thanks(0)   Quote stevebm1 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2013 at 6:18am
looking good macro,hope it works,after all your hard work
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Alpha1 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2013 at 10:54am
Looking good.

Do you have a list of boards that have the custom you are replacing?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DanP Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2013 at 11:02am
Very nice work Macro, sorry I missed this first time around.   I kinda like the aesthetics of the resistors like that LOL

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Post Options Post Options   Thanks (0) Thanks(0)   Quote guddler Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2013 at 11:28am
Is this the brown coloured wafer thing that sticks up on a Bubble Bobble?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote astaroth Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2013 at 12:15pm
Why does the left hand IC socket look tapered?
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Post Options Post Options   Thanks (2) Thanks(2)   Quote Macro Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2013 at 12:16pm
no, the black coloured thing that sticks up on rainbow islands (and several others)

it has 3 x 5 bit DACs in one hybrid - bubble bobble etc. have a single 6 bit DAC on them.

if this one works, BB should be possible the same way.


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Post Options Post Options   Thanks (1) Thanks(1)   Quote Macro Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2013 at 12:17pm
'cos it's a 24 pin wide socket cut in two (I only had one single one!)

once it's done and working, no point in sockets - I'd just solder the PAL's in directly, but for testing need to be able to reprogram in case the code is wrong

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Post Options Post Options   Thanks (0) Thanks(0)   Quote astaroth Quote  Post ReplyReply Direct Link To This Post Posted: 19 Dec 2013 at 2:06pm
That explains it! Thumbs Up
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Macro Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec 2013 at 9:01am
code has been written for the GAL's

(and fits in a 20V10 or 22V10, but not in a 16v8 ... another PCB change needed for that!)

so next up is to add the pins and fit it to my RI PCB and see what it looks like
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Post Options Post Options   Thanks (1) Thanks(1)   Quote bonehead Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec 2013 at 9:55am
Brilliant!!! Can't wait to see the end results.

Well done
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Alpha1 Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec 2013 at 10:38am
Nice work macro
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Post Options Post Options   Thanks (0) Thanks(0)   Quote backflipper Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec 2013 at 11:21am
Nice one Mike.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote stevebm1 Quote  Post ReplyReply Direct Link To This Post Posted: 27 Dec 2013 at 1:04pm
look forward to hearing your test resultsSmile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stevebm1 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 2014 at 4:35pm
any updates macro?
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Macro Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 2014 at 8:41pm
back from the dead, AKA fitting a new bathroom ...

with the help of some image intensifiers (glasses), I have put the resistor legs I cut off when I put the resistors in into the relevant holes so I can fit it into a PCB to do some testing!

I think I would solder them since they are a bit too small for round pin sockets and although probably good enough for testing, it wouldn't be much good for a permanent solution.

so, testing on rainbow island next, followed by being soldered to a Final Blow PCB


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Post Options Post Options   Thanks (0) Thanks(0)   Quote stevebm1 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jan 2014 at 8:18am
fingers crossed it all works ok mateThumbs Up
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Macro Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jan 2014 at 11:01pm
well, I know it's not much to look at, but

a) the real hybrid gives me the same screen display (I need to fix the board)
b) it works!


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