Quantum Repro Board - Post Your Progress!

[Paladin]

So who else is working on theirs? We can also use this thread to help troubleshoot any issues and answer questions. Post your progress![/IMG]

Bungy, could you share some high res shots of your completed board? Even though an excellent parts layout sheet came with the board, it would be nice to have pictures of an actual completed/tested board to use as reference for those of us who haven't taken on a project of this size before.

 

[Riptor]

Ok, I have 5 kits available. These will be the last ones available, first come first serve. Price is $85 shipped in the states.
Includes all items in attached list and a machine pin socket for the 68000 cpu.

 

[bungy]

Bungy, could you share some high res shots of your completed board? Even though an excellent parts layout sheet came with the board, it would be nice to have pictures of an actual completed/tested board to use as reference for those of us who haven't taken on a project of this size before.

I am away this week, but I can post some pics when I get back. Any areas in particular that you want to see?

 

[Paladin]

Pics of the vector section and the power section next to it would be appreciated.

I started working on my board today. About 6 hours in and I've got the majority of the resistors and small caps installed. I still have some parts to order, but I had enough to get started.

Next up will be the sockets. I'm planning on socketing all the chips, just for the heck of it. I still need to order all the 16 pin sockets, but I've got all the others.

So far I'm having fun working on it. I broke the 6 hours up into a couple 3 hour stretches so I wouldn't get burned out.

 

[Riptor]

I have 5 of the IC kits left. These will be the last ones available. Price is still $85 shipped on these.

 

[Paladin]

I spent 3 hours today soldering sockets. I didn't order enough 16 pin sockets, so they're on order.

Is anybody else working on theirs yet?

 

[Tronic]

I am surpised that these are getting built as fast as they are. I assumed, being summer, it would take a month or so before people would even start on them.

 

[bungy]

I finally got the varistors and installed them, but then I noticed the vector output had some intermittent problems causing the spot killer to come on. With Tronic's help, we narrowed it down to the AVG Eliminator which had some questionable solder joints. I touched them up and it has been running fine since. I had it on for about 6 hours today, seems solid so far.

Bungy, could you share some high res shots of your completed board? Even though an excellent parts layout sheet came with the board, it would be nice to have pictures of an actual completed/tested board to use as reference for those of us who haven't taken on a project of this size before.

I uploaded some pics here:
http://s998.photobucket.com/albums/af105/bungy7/Quantum Repro PCB/

 

[Paladin]

Thanks for the pictures Bungy, they're exactly what I was looking for!

I have a few questions. I know different parts from different manufacturers may not look the same, but here are some things I've noticed looking at your board compared to what I ordered from Mouser using the BOM on page 1 of the original repro thread:

Your L1 looks like a standard resistor, my mouser 652-9250A-104-RC is what looks like a standard black cylindrical diode but it has a silver stripe on each end. I'm guessing it doesn't matter which way this is installed.

Your L2, L3, L4 are white, my mouser 652-9250A-102-RC looks just like my L1 with the exception of the identifying color stripes.

Your C8, C25 are red film capacitors, my mouser 539-150473J250BB are white cylindrical diode shaped - they look similar to what you have installed at L2, L3, L4.

The BOM still shows the value of R49 as 1.5k with a side note of 'possibly 3.3k Ohm, checking'. Has this been resolved? I ordered 1.5k.


Another thing for those who have ordered the chip kit from Riptor and still need to order the other chips on the BOM. I've used a company called American Microsemiconductor Inc. in the past for some chips to fix an Omega Race, so I checked the prices there for the remaining chips. Some of them were cheaper than Mouser, and they also have the 1N100A available. The 1N100A is a little more expensive, but the savings on the other chips along with not needing to order the 1N100A from a separate place along with shipping more than makes up for it.

Here is what I bought from them, and the prices:
SN74S02N x2 @0.51
1N100A x3 @1.27
SN74LS399N x1 @1.14
SN74S86N x1 @0.71
SN74S04N x1 @0.58
SN74LS175N x5 @0.32
SN74S00N x1 @0.27

 

[Tronic]

Paladin,

To answer your question about the inductors, it looks like Bungy ordered my earlier version of the inductors from Mouser. The only reason I changed them is becuase the white ones are almost too long for the holes, and I think the newer part numbers were a bit cheaper.

Yours should work fine and you don't need to worry which way they go, they are not polarity sensitive.

Use the 1.5k Ohm resistor, I haven't been able to get the 3.3k to work yet and the 1.5k is and has been working fine.

 

[bungy]

For the inductors, I just ordered what was on the sheet. They fit fine for me.
L1: 542-78F101-RC
L2, L3, L4: 807-1537-12K

For C8 & C25, I think I just picked a different one because I didn't like the dimensions of the one listed. I ordered Mouser part 598-DSF050J473.

I haven't had any problems using a 3.3k resistor at R49. I did check the value on my original Quantum board to be certain, and it is 3.3k.

 

[mrbill08]

I ended up having to build three - one for me and two for friends.

I decided to socket the linear, programmables, memory, processor, pokeys, and AVG. All sockets are in except for the AVG as I will use a DIP one for my board and the other two will use the one from Mark which needs a different socket. The dip switches are in. All 20 pin TTL ICs have been soldered in along with a few 16 pin ICs. I'm populating the rest working from the bottom up, doing everything three at a time. Unfortunately I have to wait for the passives for one of the boards to arrive before I can start populating them. It was great to have the component layout sheet included, I am highlighting each part as it is soldered in place.

I also picked up a set of lead benders on ebay for the passives as I will have a lot of lead forming to do.



Bill

 

[dezbaz]

What have you guys done to get full sets of burnt Proms and ROMS for this


I am guessing doing it yourself

 

[Tronic]

What have you guys done to get full sets of burnt Proms and ROMS for this


I am guessing doing it yourself

The PROMS were taken care of by me for most who ordered. I left the ROMS up to the individual because 2764's are pretty easy to come by and you can use the MAME image since it's correct.

 

[dezbaz]

The PROMS were taken care of by me for most who ordered. I left the ROMS up to the individual because 2764's are pretty easy to come by and you can use the MAME image since it's correct.

Maybe I have proms then

I will have to check, I have 2 ic's marked
136002-125
137290-001

Is that them?

(EDIT: One is the prom, 1 is the PLA LOL) Sorry, I should read . . .

 

[Tronic]

I haven't had any problems using a 3.3k resistor at R49. I did check the value on my original Quantum board to be certain, and it is 3.3k.

Great work on testing that out, I just haven't had the time to test the different value. When I tried it on my proto board, it dampened the signal enough to cause the spot killer to come on. But the proto board wasn't the optimal place for me to test it since the analog area being unmasked allowed for a few shorts to occur.

Anyway, it's good to know those components will work. The schematic says 1.5k, but as Bungy put it, there were 3.3k resistors actually in the board. Even more weird is that the schematic has R49 listed as "not loaded".

 

[Tronic]

Maybe I have proms then

I will have to check, I have 2 ic's marked
136002-125
137290-001

Is that them?

Yep, that's them

 

[WETHEREDS]

I have started the build with all the passives first.... but I could not find location of C130 - It was late last night and my eyes were blurring out! Can someone point in the area it is located. Thanks.

I started with the passives as I kept going back & forth on whether I was going to socket everything or just some. I have decided to socket everything. Duel wipe, tin plated for all the 74 and gold plated for uP, eproms, pokeys, RAM, AVG, proms, pla, and vector section. Ok, it probably is OTT but in the back of my mind is that if the board does not work once completed, it is going to be easier to troubleshoot if all are socketted...

Also I must have 100 or so of 6116-P2 RAM which were given to me years ago. They are 120nS. The BOM calls for 6116-P3 which are 150nS. Any probs using the P2's?

 

[bungy]

I have started the build with all the passives first.... but I could not find location of C130 - It was late last night and my eyes were blurring out! Can someone point in the area it is located. Thanks.

C130 is the red cap at the bottom center of this pic. On the original board it was a cap placed over R205.

 

[Tronic]

I have started the build with all the passives first.... but I could not find location of C130 - It was late last night and my eyes were blurring out! Can someone point in the area it is located. Thanks.

C130 is over between the edge of the PCB and the outside one of two POKEY's.


[edit] bungy beat me to it.