Building a repro Quantum PCB / cabaret

SITREP - All of the parts for the board are installed except for a handful which are en route. I ordered the 1495's from china/ebay so they are taking a while to get here. Attached is an updated BOM with a few additions:

sub DG201BDJ-E3 for LF13201 @ 10B and 10E
sub CD40106BE for MC14584 @ 10N and 11P
sub SN74LS86AN for 74S86 @ 10K

It looks like everything is available from mouser except for the below parts:
AVG @ 6B
2x pokey @ 2/3D and 2/3B
68000 CPU @ 1K/L
x2122 @ 3R7F
4x MC1495L @ 11C, 11B, 12C, 12B
82S25 @ 7F
VDR @ RV1 & RV2
PLS153 @ 1B
82S129 @ 6H

I don't currently have a way to test the board once all of the parts have arrived and don't really feel like paying $45 + shipping for the tempest adapter that costs probably $0.50 to make. I think I am going to find a complete Tempest harness and re-pin it so no adapter is needed (anyone have one?). I have a Centipede cabaret control panel on the way and I have everything else needed to be able to test it on my bench. Then all I need to do is find a cabinet.
 

Attachments

  • mouser order.txt
    12.2 KB · Views: 1
If you have an analog oscilloscope and +5V/+12V/-12V power supply, then just power it up on the bench like the Big Boyz do. :)
Seeing is believing. Then worry about playing later. (Remember that +12V needs to be applied to the 10.3Vunreg pin for the POR).

q4.md.jpg
 
I don't have a power supply with all of the necessary voltages so would need to build a harness to use my power brick and ar2. It's definitely doable but if I'm going to be rebuilding a Tempest harness I can wait I guess.
 
Humm, you mentioned "test bench" so I assumed you had variable power supplies (and a scope).

Also, if the board fails to boot, take note of the self-test procedure in supplemental document CO-221-01 -> adding LEDs to simulate the CP LEDs is very useful for RAM and ROM validation.

QtestLEDs.jpg
 
Good luck.

I did one of the Star Wars board sets and I ended needing @lilypad19 to help clean up the mess. Lol

Was a great learning experience in the end.

Does @lilypad19 also work on Quantums? :D

My first repro Q worked the first time.
My second repro Q did not work. One pin was not soldered. Grrr. Found it eventually. LOL
 
I had a similar problem with my Quantum pcb build as VectorCollector. My board did not work the first time I powered it up. I decided to recheck every removable chip one-by-one and see if I missed something. On the last chip, of course, I found a bent pin not seated. Reinstalled the pcb and the game worked and is still working. What a relief, I thought I may have to send the PCB out to get it fixed.

I have sent vector boards to a good friend of mine for repairs.

 
Once my order from Arcadechips arrives the board will be complete. Still looking for a harness to test it though.
 
You don't need a harness. Oh, wait, nevermind. LOL :)

tumblr_nx5vg7jAj71s6w6q7o1_500.gif

Just remember, if powering up for the first time in a cabinet (or on a bench) with a 6100 or AMP, disconnect the monitor and preferably validate it's playing/coining-up/etc and displays on a scope instead.
 
You don't need a harness. Oh, wait, nevermind. LOL :)

View attachment 791912

Just remember, if powering up for the first time in a cabinet (or on a bench) with a 6100 or AMP, disconnect the monitor and preferably validate it's playing/coining-up/etc and displays on a scope instead.
Is that a vectorscope?
 
Not mine. But seems it's a TEK 1720 VS.



Unsubscribed again ... damn it. 🍆 🍆

Ok. I thought it looked familiar. I'm using a Tek 1720 + 1730 right now to characterize the Atari 2600 output. Well, not NOW now. But recently, in my free time.

I guess the guy built a MAME output converter to feed to the vectorscope. Cool stuff.
 
I picked up a space duel harness and repinned it for quantum. I still need to sort out the sound and control panel/coin door harnesses but I am finally able to test the pcb. It looks like it works! The x-axis is flipped for some reason but otherwise it looks to be working. Once I sort out the rest of the harness I'll get it plugged into a 6100.

20250129_105649.jpg
20250129_105721.jpg
 
Back
Top Bottom