Re: Wico XY Pattern Generator - Decoding Switches

All,
If you’re interested in the re-capture of Dave’s Wico Schematics; I’ve temporarily posted them there:
http://Pinball-Mods.com/blogs/wp-content/uploads/2011/11/XYPattern.pdf

Still to-do:
1) Determine 7493 wiring vs Dave’s schematics.
2) Front Panel board integration – pending Switch Decode.
3) Simulate Opamps for circuit understanding.
4) Power Supply: pending power measurements – if someone will volunteer to get them.
5) PCB Layout.
6) BOM Generation.

Changes w/regards to Dave’s schematics:
A) Decoupling caps for each IC.
B) 0ohm “202 solder shorts” for unconnected pins of TTL gates at U2, U3, U5, and the “top” of R30 (R3). So they can be reversed if necessary.
C) Passives are likely to have different RefDez.
D) IC Power Supply pins are shown at decoupling grid.
E) “Bussed” Address pins.
F) Unused Gates are “strapped” to a known state.
G) 74xx TTL logic is becoming obsolete. Plan to use 74HC logic or 74LS logic – haven’t decided.

My plan is to have the board manufactured by batchpcb.com as a dual sided board.
Surface Mount ( yes; I can hear the screams of horror ) as I want to minimize PCB size – thereby cost.

I’d appreciate any “peer reviews” of the schematic page.

As far as open source for the schematics / pcb; I’m concerned w/regards to the original owners of the design. IE can’t really open source a product I don’t own, can I?
Besides, Dave hasn’t really given his blessing to the project given the source of the schematics are via his work.
John

From: Zitt Zitterkopf
Sent: Monday, November 07, 2011 9:48 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Wico XY Pattern Generator - Decoding Switches
David,
Many thanks. I’ll put a shorting block to the R3 topside so it can be disconnected – I’m pretty sure it should be there; even tho TTL generally defaults to “high” if unconnected.

I found the problem I discovered – It wasn’t with the 7490; but all the 7493s. For some reason your pinouts via PADS appear wrong.
http://www.ti.com/lit/ds/symlink/sn7493a.pdf
Fortunately; the QA is right ... but QB/C/D are incorrect . On the 93; they are not wired as in the 92... 90 and 93 do share the same pinouts tho.
So; are the pin NAMEs right; or are the pin numbers? looks like the same “mistake” is present on U3/U4/U5.

I’ll go ahead and wire up the opamps – thanks for the info.

John

From: David Fish
Sent: Monday, November 07, 2011 8:43 PM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Wico XY Pattern Generator - Decoding Switches
John,

>>@A-7 on page 1; R3 topside is listed as a NC.

Weird but that’s the way it is on my board. Maybe they forgot to add a +5V jumper.

>> I think you had Q2 and Q3 pins swapped

The pinout for the 7490 is correct QA=12, QB=9, QC=8 and QD=11. The PADS library part used Q0-Q3 instead of QA-QD.

>> The Power supplies weren't pictured for U14, 15, and 16.

Good catch. They’re powered by +/-12V, but that’s not shown on the schematic.

I think the connector issue stems from the fact that they have the two identical connectors numbered opposite of each other. The main board 8-pin connector is 1 thru 8 L->R while the switch board is 1->8 R-L. I wonder if I plugged my cable back in wrong? There’s no labels and the keys are symmetric (stupid). Will look into this more tomorrow.

Dave

From: owner-vectorlist@vectorlist.org [mailto:owner-vectorlist@vectorlist.org] On Behalf Of Zitt Zitterkopf
Sent: Monday, November 07, 2011 5:37 PM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Wico XY Pattern Generator - Decoding Switches

Dave - You rock! Thanks to everyone else too.
I've schematic captured based upon your schematics; Dave - many thanks. The only peices I haven't captured are the PSU, the 2nd page, and diode switch matrix.
 
Some questions came up while "re-engineering" the schematics.
 
@A-7 on page 1; R3 topside is listed as a NC... I'm guessing this is incorrect as why would anyone put a resistor without a second conection?
My Guess is that R3 ties to +5V like the other two (R4, R5).
 
IIRC; something was "off" when I wired U2 @ D-6. I think you had Q2 and Q3 pins swapped. I'll look for sure when I get home.
 
The Power supplies weren't pictured for U14, 15, and 16. These Opamps are tied to the +12 and -12 rails?
I plan on simulating the opamps to try to gain insight as to what they are doing.
 
Seems odd that the DAC08s are driven from a non-linear voltage rail. IE V+ is 5V and V- is -12V. I'd have thunk they rails would be symetrical. IE +/-12V. Maybe the opamps linearize it?
 
Can anyone get me some rail power measurements?
I'm going to try and do away with the transformer and linear regulators in favor of a more complex (yeah; I know K.I.S.S) PWM psu which puts our all three rails.
If I knew what the average current was for each rail; a small PWM might be nice and cheap.
 
I *so* wish this was an opensource hardware project ... I'd so like to release my PCB and schematics (assuming it works) to the public.
<sigh>
 
John

--------------------------------------------------------------------------------

From: dfish_1@comcast.net
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Wico XY Pattern Generator - Decoding Switches
Date: Mon, 7 Nov 2011 17:05:13 -0500

John,

I already have mine apart on my desk. I’m looking at it now. I’m taking lots of pictures.

Dave

From: owner-vectorlist@vectorlist.org [mailto:owner-vectorlist@vectorlist.org] On Behalf Of John Robertson
Sent: Monday, November 07, 2011 4:49 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Wico XY Pattern Generator - Decoding Switches

David Fish wrote:

John,

Before you mirror the schematics let me take a look at them in depth. It was a looooooong time ago when I drew them.

Unfortunately, I no longer have the schematic source file or access to PADS schematic cap even if I did. I looked at them online and yes, something looks screwy about the switch board to main board connector pinout. I’m thinking there’s a reversed connector involved here. I’ll let everyone know what I find.

Dave

I have a working WICO XY Pattern Generator if you need any pictures (either of you) just let me know and I'll crack it open...

John :-#)#

From: owner-vectorlist@vectorlist.org [mailto:owner-vectorlist@vectorlist.org] On Behalf Of Mark Shostak
Sent: Monday, November 07, 2011 2:44 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Wico XY Pattern Generator - Decoding Switches

You can mirror the schematics from ionpool

On Mon, Nov 7, 2011 at 12:43 PM, John Robertson <pinball@telus.net> wrote:

Zitt Zitterkopf wrote:

I’m looking at the schematics for the Wico XY Pattern Generator; and can seem to figure out how the Front panel PCB connects to the Main Board.

At A-8 on the main schematics page; it shows P3-1-8 as connected to the D Flip Flops and the A10 of the U7/U8 pattern generating roms.

However, P3 doesn’t seem to connect correctly to the “cable” connected to the front panel board at B-8 on the second page.

It appears that the diode matrix appears to drive set/clear to Dflip flop U6-A which controls A9 on the ROMs.

But I’m unsure of the encoding given I can figure out how “P3” connects to the Front panel board.

Anyone have an idea?

John

Do you have a copy of the schematics so I can put them up on TTL? The manual (such as it is) is there along with images of the Eproms.

ftp://ftp.flippers.com/TTL/TestEquipment/WICO

Thanks,

John :-#)#

-- John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames) www.flippers.com "Old pinballers never die, they just flip out"

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Received on Tue Nov 8 01:52:22 2011