Quantum Repro Board - Post Your Progress!

[Tronic]

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?

Becuase this is static RAM, I believe you can use faster speed. This is going off my education days back when I was getting my degree so someone correct me if I am wrong. I thought dynamic RAM was the only one that you didn't want faster refresh rates than the circuit speed.

 

[bungy]

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?

I can't give you any technical reasons, but I can tell you what has and hasn't worked for me. I originally had all P2s, but I installed one backwards. I replaced it with a P3 and it still didn't work. Then I replaced everything in that bank of 4 with P3s and it came up. So I have been using one bank of P3s and one bank of P2s with no problems so far.

 

[Tronic]

I can't give you any technical reasons, but I can tell you what has and hasn't worked for me. I originally had all P2s, but I installed one backwards. I replaced it with a P3 and it still didn't work. Then I replaced everything in that bank of 4 with P3s and it came up. So I have been using one bank of P3s and one bank of P2s with no problems so far.

That's highly possible that you need to keep the set of four IC's the same, as the circuit is trying to use them as one RAM bank. The difference in speed may cause the system test at boot up to fail.

 

[bungy]

Does anyone know what the DIP switches at 4B do? I can only find information about the switches at 4C/D which are coinage settings.

 

[Tronic]

Doesn't do anything, I believe it's mentioned in the manual somewhere.

 

[Paladin]

I spent 4.5 hours today and got pretty much everything I had left soldered. Later tonight I'll start installing the IC's into the sockets.

I still haven't ordered the DAC312's yet. I wanted to see if anyplace has them cheaper than Digikey. I also forgot to get a 40 pin socket for the AVG replacement board, and I'm one 14 pin socket short. Mouser was out of stock of the 100uf 35v caps when I initially ordered my parts but they have them again now, so I just placed my last order apart from the DAC's. Of course right after I placed the order I remembered that I don't have those nylon posts that hold the large transistors in place. Oh well, I'll come up with something.

A couple things of note on the BOM:
Item 107 - TP11 GND - This needs to be changed to a quantity of 2. There's one at the top of the board, and one at the bottom. I noticed it when I came up short 1, so right now I don't have anything in the reset holes. I've added one to my last parts order.

For some reason items 25 and 27 are the same part, 598-CD10ED390JO3F. They should be combined into one line item with a quantity of 3. Not a big deal, but it confused me for a minute or two since I'm using the BOM to check off items as I go.

Using the part numbers provided, the 3 capacitors at locations C4, C130 and C80 I received from Mouser are phisically very large. They look like they belong on a monitor chassis, not a game PCB. I'm guessing the values are OK, but they sure look out of place.

One other suggestion is to seperate the parts that you don't need if using DAC312's. I ended up ordering some before I realized that they were on the list, since I was just going down the list and pasting the part#'s into Mouser. When I noticed it I crossed off the items on the BOM that are crossed off in red on the PCB print out.


I've had a blast working on this project, and hope that it fires right up when I get a chance to test it. Maybe I shouldn't use the word 'fire' though! Many thanks to Tronic, Riptor and Bungy!

 

[eightbitwhit]

Please forgive me if this has already been discussed before, but is there any chance that a 2nd run of PCB's will be done? If so, any idea on timelines?

Thanks!

 

[bungy]

Using the part numbers provided, the 3 capacitors at locations C4, C130 and C80 I received from Mouser are phisically very large. They look like they belong on a monitor chassis, not a game PCB. I'm guessing the values are OK, but they sure look out of place.

I checked the dimensions of the caps listed in the BOM before I ordered and I changed all those to smaller versions. These are the ones I ordered:

C4: 667-ECQ-V1103JM
C80: 647-QYX2A223KTP
C130: 598-DSF050J473

 

[dezbaz]

I spent 4.5 hours today and got pretty much everything I had left soldered. Later tonight I'll start installing the IC's into the sockets.

I still haven't ordered the DAC312's yet. I wanted to see if anyplace has them cheaper than Digikey. I also forgot to get a 40 pin socket for the AVG replacement board, and I'm one 14 pin socket short. Mouser was out of stock of the 100uf 35v caps when I initially ordered my parts but they have them again now, so I just placed my last order apart from the DAC's. Of course right after I placed the order I remembered that I don't have those nylon posts that hold the large transistors in place. Oh well, I'll come up with something.

A couple things of note on the BOM:
Item 107 - TP11 GND - This needs to be changed to a quantity of 2. There's one at the top of the board, and one at the bottom. I noticed it when I came up short 1, so right now I don't have anything in the reset holes. I've added one to my last parts order.

For some reason items 25 and 27 are the same part, 598-CD10ED390JO3F. They should be combined into one line item with a quantity of 3. Not a big deal, but it confused me for a minute or two since I'm using the BOM to check off items as I go.

Using the part numbers provided, the 3 capacitors at locations C4, C130 and C80 I received from Mouser are phisically very large. They look like they belong on a monitor chassis, not a game PCB. I'm guessing the values are OK, but they sure look out of place.

One other suggestion is to seperate the parts that you don't need if using DAC312's. I ended up ordering some before I realized that they were on the list, since I was just going down the list and pasting the part#'s into Mouser. When I noticed it I crossed off the items on the BOM that are crossed off in red on the PCB print out.


I've had a blast working on this project, and hope that it fires right up when I get a chance to test it. Maybe I shouldn't use the word 'fire' though! Many thanks to Tronic, Riptor and Bungy!

Brilliant!

Thanks for the great detail

 

[Paladin]

I checked the dimensions of the caps listed in the BOM before I ordered and I changed all those to smaller versions. These are the ones I ordered:

C4: 667-ECQ-V1103JM
C80: 647-QYX2A223KTP
C130: 598-DSF050J473

I knew I shouldn't have made my 'last' parts order before figuring out what you used! I'm just so close that I want to get to the finish line already!

 

[mrbill08]

If you don't want to shell out the dough for the DAC 312s and have an asteroids deluxe or two laying around, many of them had the alternate circuit using AM6012s which are the AMD equivalent to DAC 312s. You can "borrow" them until you find a cheaper source. Also Battlezone used the DAC 312s as well.

The rest of the parts came in from the friends whose boards I am also building. So I will be able to get back to all three this weekend.

Bill

 

[Tronic]

Please forgive me if this has already been discussed before, but is there any chance that a 2nd run of PCB's will be done? If so, any idea on timelines?

Thanks!

At this point there isn't any plans to do a 2nd run. I would need to have at least 15 more people on a pre-order to do another run of these. But if there is enough interest I will do a 2nd run.

 

[Tronic]

I checked the dimensions of the caps listed in the BOM before I ordered and I changed all those to smaller versions. These are the ones I ordered:

C4: 667-ECQ-V1103JM
C80: 647-QYX2A223KTP
C130: 598-DSF050J473

Thanks for the update on those parts that have better dimensions. I will update the BOM and add those part numbers.

 

[Paladin]

Two and a half hours to install all the chips into the sockets.

Some things to note:
The two custom chips from Tronic at 1B and 6H are labeled so the printing is upside down compared to all the other chips on the board.

The 74LS00 and 74LS109 chips don't have a notch for pin 1. I installed them with the writin orientated the same directions as the rest of the chips.

The chip at 7F is listed as an 82S25, the chip I got from Mark is labeled 74S89. They're compatible, but the difference threw me for a few minutes.

Five TL082's are needed, and they are split into two entries in the BOM, one lists 4 and the other lists one. They should be combined.

Now i'm just waiting on my last order, and to get the DAC's. I'd say about half an hour of work left to finish.

 

[eightbitwhit]

At this point there isn't any plans to do a 2nd run. I would need to have at least 15 more people on a pre-order to do another run of these. But if there is enough interest I will do a 2nd run.

Fair enough - thanks for the reply back. I'd like to put my name on an interest list. Thank you.

 

[WETHEREDS]

Board is built. Burning ROMS today. The ROM files I have are listed 102 to 208. How do these relate to the Rows 2 and 3 for the ROMS on the board?

 

[Tronic]

If you call the row closest to the big 68000 CPU, row 1, then start next to the pokey and count up with the chips to 5.

For example 201,102,203,104,105

then go to row two and start again at the pokeys with 206 and go up.

 

[Paladin]

My DAC's should be here today. I just assumed ground would be the cheapest shipping option without using the shipping estimate link. Turns out USPS would have been cheaper. Oh well, $30 for two chips delivered.

Now I just have to figure out where to test it. I wonder if I could make an adapter to run it in my Tempest cab? I do know some folks with working Quantums as well.

 

[bungy]

Board is built. Burning ROMS today. The ROM files I have are listed 102 to 208. How do these relate to the Rows 2 and 3 for the ROMS on the board?

If you call the row closest to the big 68000 CPU, row 1, then start next to the pokey and count up with the chips to 5.

For example 201,102,203,104,105

then go to row two and start again at the pokeys with 206 and go up.

Here is a handy visual reference.

 

[Tronic]

Thanks bungy that is even better. I don't have the time to dig up a pic and resize it perfectly.