jamers Posted March 8, 2004 Share Posted March 8, 2004 Hello All. What I want to accomplish is to take old cartridge for Atari 2600 and do all the modifications necessary to fit an 2732 EPROM in it. I'm in a half-way it means I deassembled an old cartridge (Pac man) and desoldered original PROM. Now what? I want to attach 24-pin socket or ZIF for making changin of EPROM easier. I also know that I must cut some tracks and add 7404 hex inverter. But which tracks are to be cut and how to connect 7404? Could anyone drop me useful hint? It is my first effort at this field so please take lightly on me Quote Link to comment Share on other sites More sharing options...
Nukey Shay Posted March 8, 2004 Share Posted March 8, 2004 I just spill the blood of a newborn http://www.atarionline.com/ataricart.html I was...inverted. Quote Link to comment Share on other sites More sharing options...
jamers Posted March 8, 2004 Author Share Posted March 8, 2004 Thank You for Your fast answer Yes the text really helps a lot but it concentrate on 2532 EPROM. It says: "carts can also be made using a 2732 eprom, but traces on the board must be cut and changed". So my questions are: what traces? and how changed? Quote Link to comment Share on other sites More sharing options...
jsoper Posted March 9, 2004 Share Posted March 9, 2004 All you had to do was go to google (www.deja.com) and type in: 2532 2732 >I'm currently fixing a friend's Firepower and have found a blown PROM on >the speech module. My understanding is that I would need to put a 2532 >EPROM in to replace it, but I can't get hold of one anywhere here, so >I'll have to use a 2732. Does anyone have the information on what I'll >have to jumper/rewire to make it work? > >Regards, >Phil 2732 2532 01 A7 A7 02 A6 A6 03 A5 A5 04 A4 A4 05 A3 A3 06 A2 A2 07 A1 A1 08 A0 A0 09 O0 O0 10 O1 O1 11 O2 O2 12 GND GND 13 O3 O3 14 O4 O4 15 O5 O5 16 O6 O6 17 O7 O7 18 -CE A11 19 A10 A10 20 VPP -CE 21 A11 VPP 22 A9 A9 23 A8 A8 24 VCC VCC Pins 18,20 and 21 need changing. -- Steve Huntley. Swallow Amusement Machines. *** Pinball and Videos *** Quote Link to comment Share on other sites More sharing options...
jamers Posted March 9, 2004 Author Share Posted March 9, 2004 Thank's a lot! Now I'm ready to build my cart Quote Link to comment Share on other sites More sharing options...
Cassidy Nolen Posted March 9, 2004 Share Posted March 9, 2004 The 2732 hack is not worth the effort; not when you can get 2532's for the same price. The pcb's that AA sells use them, and they are great quality. In other words, if you have those eproms already, I would suggest just getting the AA pcb for it. Cassidy BTW, the first 20 or so Polo's I made were using original pcb's and a 2732. Took me forever to make in a (relatively) mass quantity. Quote Link to comment Share on other sites More sharing options...
jamers Posted March 10, 2004 Author Share Posted March 10, 2004 The only problem is that my programator doesn't support 2532 I know that PixelPast makes great PCBs. I only want to make my own just for sport/fun Quote Link to comment Share on other sites More sharing options...
Chuck Gill Posted March 11, 2004 Share Posted March 11, 2004 Jamers, If you really want to modify an old Atari one, here's a quick and dirty diagram. The red lines show where to cut the traces. Chuck Quote Link to comment Share on other sites More sharing options...
jamers Posted March 11, 2004 Author Share Posted March 11, 2004 Thank You Chuck! I'm amazed how friendly and helpful are people in this forum! Thank You all! Quote Link to comment Share on other sites More sharing options...
jamers Posted March 11, 2004 Author Share Posted March 11, 2004 But one thing bothers me Chuck, on Your diagram the pin 8 of 7404 looks like input and pin 9 looks like output, is it all right? Shouldn't it be swapped? Quote Link to comment Share on other sites More sharing options...
Chuck Gill Posted March 12, 2004 Share Posted March 12, 2004 But one thing bothers me Chuck, on Your diagram the pin 8 of 7404 looks like input and pin 9 looks like output, is it all right? Shouldn't it be swapped? The diagram is ok. The input (pin 9) comes from the 2600 cart connector. The output (pin goes to the eprom chip. Chuck Quote Link to comment Share on other sites More sharing options...
Susuwatari Posted March 13, 2004 Share Posted March 13, 2004 Actually that diagram and that picture is correct. 8 is output and 9 is input. The picture is showing that inverter upside down so it could be confusing. Quote Link to comment Share on other sites More sharing options...
jamers Posted March 14, 2004 Author Share Posted March 14, 2004 The diagram is shurely OK. That was just me trying to play smart (another lesson that I should not say anything about something I don't know). Thanks again Chuck! I assembled it today and it works! Now the next thing in my quest of atari cartridge enlightement is 8kB cartridge The thing is that I want to take old atari 8kB cartridge (with standard F8 bankswitching logic) and make it suitable for 2764 EPROM. Any hints for me? Any cool diagrams like the Chuck's one? Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted March 14, 2004 Share Posted March 14, 2004 Click on jsoper's weblink and figure it out from there. Quote Link to comment Share on other sites More sharing options...
jamers Posted March 15, 2004 Author Share Posted March 15, 2004 Yes, I will give it a try. But as I understand the diagrams on jsoper's website it is the way to recreate F8 bankswitching logic. But is there a way to reuse the logic already installed on oryginal F8 atari cart? Or I misunderstanding something again? Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted March 15, 2004 Share Posted March 15, 2004 The bankswitch logic is built into the ROM chip in released games. Quote Link to comment Share on other sites More sharing options...
jamers Posted March 15, 2004 Author Share Posted March 15, 2004 Thanks for explaining this one to me. I will post progress of my work whenever it will be Quote Link to comment Share on other sites More sharing options...
jamers Posted March 15, 2004 Author Share Posted March 15, 2004 I'm having a hard time understandig this diagram. Could You help me with it? | -------------| >()-------------- Eprom | |/ Enable | 5v 5v A12 -+-|- __|___|_ A11 ---| | Set Rst| A10 ---| | | A9 ---| 7 A0--|D 7 Q|-- A12 A8 ---| 4 N | 4 | of eprom A7 ---| 1 A | | | 7 | A6 ---| 3 N |()-+-| >()---|> 4 | A5 ---| 3 D | | |/ |________| A4 ---| / | A3 ---| / ___ /A2 ---| / ___ 1000pf (0.001 uf) /A1 ---| / | --|_/ | gnd 1. The A1 to A12 on the left are adess lines from atari 2600 cart port point of view, right? And that they go through NAND and Inverter and finishing on what pin of 7474? 2. A12 goes through Inverter and connects with Eprom Enable (is it pin 20 in 27©64 EPROM?) 3. A0 from cartridge port goes through 7474 and pin Q of this chip connects with pin 2 of 27©64 EPROM, right? Quote Link to comment Share on other sites More sharing options...
EricBall Posted March 15, 2004 Share Posted March 15, 2004 I'm having a hard time understandig this diagram. Could You help me with it? 1. The A1 to A12 on the left are adess lines from atari 2600 cart port point of view, right? And that they go through NAND and Inverter and finishing on what pin of 7474? That's the clock input. Pin 3 for flip flop 0. 2. A12 goes through Inverter and connects with Eprom Enable (is it pin 20 in 27©64 EPROM?) I'd use pin 22 (~OE) output enable, and tie pin 20 (~CE) chip enable to ground. ~CE high is often used to put a RAM or ROM into a low power state and it might require time to become active. ~OE controls the output and tristates the databus when high (which is what we want). 3. A0 from cartridge port goes through 7474 and pin Q of this chip connects with pin 2 of 27©64 EPROM, right? correct Quote Link to comment Share on other sites More sharing options...
jamers Posted March 16, 2004 Author Share Posted March 16, 2004 Thank You for Ypur answer. It helps a lot! Quote Link to comment Share on other sites More sharing options...
pcrock Posted July 30, 2020 Share Posted July 30, 2020 On 3/10/2004 at 9:28 PM, Chuck Gill said: Jamers, If you really want to modify an old Atari one, here's a quick and dirty diagram. The red lines show where to cut the traces. Chuck Hi Friends. First I would like to apologize both for my poor english and to rebirth an old post but I need some help and it looks that here there are a lot of people that know a lot the questions I have. I did this trick modding an original ATARI pcb cart and I used a smd 74HC04 that works great when I placed a 27C32 Pitfall eprom. I Have a lot of TMS2516JL-45 that the datasheet says it is compatible pin to pin with 2716 (NOT TMS2716). I want to burn that chips with 2K games but when I do that and place it on my cart, it does not works. What is wrong?? Anybody could help me please?? Quote Link to comment Share on other sites More sharing options...
ClausB Posted August 2, 2020 Share Posted August 2, 2020 According to my Motorola 2716 data sheet, pin 21, Vpp, must be connected to 5V and will draw up to 5mA. So connecting it to A11 (as for 2732) isn't good enough. Quote Link to comment Share on other sites More sharing options...
pcrock Posted August 3, 2020 Share Posted August 3, 2020 On 8/2/2020 at 7:51 AM, ClausB said: According to my Motorola 2716 data sheet, pin 21, Vpp, must be connected to 5V and will draw up to 5mA. So connecting it to A11 (as for 2732) isn't good enough. Hi friend. Thanks for replying. So what must I do?? Another quest. May I use 74HC04 instead 7404 on trick modding an original ATARI pcb cart like the picture above??? Thanks once more.. Quote Link to comment Share on other sites More sharing options...
Shawn Posted August 3, 2020 Share Posted August 3, 2020 35 minutes ago, pcrock said: Hi friend. Thanks for replying. So what must I do?? Another quest. May I use 74HC04 instead 7404 on trick modding an original ATARI pcb cart like the picture above??? Thanks once more.. 74HC04 will work just fine. 1 Quote Link to comment Share on other sites More sharing options...
ClausB Posted August 3, 2020 Share Posted August 3, 2020 3 hours ago, pcrock said: So what must I do? Wire pin 21 to pin 24, not to the bare wire in the photo. 1 Quote Link to comment Share on other sites More sharing options...
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