CPUWIZ Posted February 5, 2014 Share Posted February 5, 2014 Quote Link to comment Share on other sites More sharing options...
+Mitch Posted February 5, 2014 Share Posted February 5, 2014 How come there isn't an option for having more than one?? http://home.arcor.de/estolberg/tools/index.html Mitch 1 Quote Link to comment Share on other sites More sharing options...
jaybird3rd Posted February 5, 2014 Share Posted February 5, 2014 I've got one. I actually have both the Atari ROM and the DevOS ROM in mine, selectable with a toggle switch. 1 Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted February 5, 2014 Author Share Posted February 5, 2014 I suppose I should have included the ancient info about it. http://home.arcor.de/estolberg/tools/index.html Quote Link to comment Share on other sites More sharing options...
+Allan Posted February 5, 2014 Share Posted February 5, 2014 Hmmm. Well, I don't have a modded system but wouldn't mind having one. If I may ask, why are did you do this poll? You don't generally chat for chat's sake so something tells me you want to know for a reason other than curiosity. I'm guessing you're think of doing/making something depending on the outcome of your poll. Allan 1 Quote Link to comment Share on other sites More sharing options...
Trebor Posted February 5, 2014 Share Posted February 5, 2014 I don't have a modded system but wouldn't mind having one. That would be my vote. Quote Link to comment Share on other sites More sharing options...
gambler172 Posted February 5, 2014 Share Posted February 5, 2014 Hi Guys i also have one and several dev carts,with this Bios Quote Link to comment Share on other sites More sharing options...
Lynxpro Posted February 5, 2014 Share Posted February 5, 2014 I've got one. I actually have both the Atari ROM and the DevOS ROM in mine, selectable with a toggle switch. Do you have a special board plugged into the ROM socket to do this? Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted February 5, 2014 Author Share Posted February 5, 2014 You just need to toggle an address line between GND and 5V to do that. Quote Link to comment Share on other sites More sharing options...
jaybird3rd Posted February 5, 2014 Share Posted February 5, 2014 Do you have a special board plugged into the ROM socket to do this? You just need to toggle an address line between GND and 5V to do that. Exactly. I just used an 8K ROM and put an SPDT toggle switch on the top address line. Quote Link to comment Share on other sites More sharing options...
R.Cade Posted February 5, 2014 Share Posted February 5, 2014 I have a 7800 with DevOS, but never made a RAM cart. Does anyone make or sell them? Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted February 6, 2014 Author Share Posted February 6, 2014 If I may ask, why are did you do this poll? Why are did I? Yes, I actually goofed and didn't include the secondary question, "Did you ever make a RAM cart?". I am a little surprised that a third of the votes are from people who didn't know what it was. I may have some time to tinker later, I am still debugging work. Quote Link to comment Share on other sites More sharing options...
+Allan Posted February 6, 2014 Share Posted February 6, 2014 Why are did I? Yes, I actually goofed and didn't include the secondary question, "Did you ever make a RAM cart?". I am a little surprised that a third of the votes are from people who didn't know what it was. I may have some time to tinker later, I am still debugging work. Ha Ha. That will teach me for trying to type something quickly and not checking it before hitting post. Allan Quote Link to comment Share on other sites More sharing options...
Wickeycolumbus Posted February 6, 2014 Share Posted February 6, 2014 I think I'm starting to understand your cryptography, CPU. This must be what your battery backed SRAM status was about DevOS needs to be updated to work with a USB port, or USB/serial converter, more people would use it then. Quote Link to comment Share on other sites More sharing options...
+Gemintronic Posted February 6, 2014 Share Posted February 6, 2014 Due to recent developments having one of these modded 7800 seems like a necessity for me. I have a PC that still has a real LPT port specifically for devices like this. Anyone know how to obtain one of these? Or someone has can mod out a 7800 as a service? Quote Link to comment Share on other sites More sharing options...
iesposta Posted February 6, 2014 Share Posted February 6, 2014 I put "Want to, but can't." I can't burn a chip with the new OS, but I can install / mod it in. Quote Link to comment Share on other sites More sharing options...
+Gemintronic Posted February 6, 2014 Share Posted February 6, 2014 I put "Want to, but can't." I can't burn a chip with the new OS, but I can install / mod it in. What kind of equipment you need? Quote Link to comment Share on other sites More sharing options...
Lynxpro Posted February 6, 2014 Share Posted February 6, 2014 From what I've read, the RAM cart has the Parallel Port installed on it. Has anyone instead mounted it and wired it to the 7800 instead? I'd imagine battery backup would be an ideal mod for such carts. Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted February 7, 2014 Author Share Posted February 7, 2014 I put "Want to, but can't." I can't burn a chip with the new OS, but I can install / mod it in. I am sure anybody would burn you an EPROM, if you pay for the EPROM and shipping. Quote Link to comment Share on other sites More sharing options...
Eckhard Stolberg Posted February 7, 2014 Share Posted February 7, 2014 From what I've read, the RAM cart has the Parallel Port installed on it. Has anyone instead mounted it and wired it to the 7800 instead?No, the transfer cable connects the parallel port on the PC to the right joystick port on the 7800. There is no need to install a parallel port anywhere. And if you just want a RAM cart to test your own code without the need to read out the contends of existing 2600 and 7800 games, Graham Percy has designed a RAM cart with the transfer code build in, so you only need to modify the cartridge but not the console. 1 Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted February 7, 2014 Author Share Posted February 7, 2014 I have a 7800 with DevOS, but never made a RAM cart. Does anyone make or sell them? Sure. 2 Quote Link to comment Share on other sites More sharing options...
R.Cade Posted February 7, 2014 Share Posted February 7, 2014 (edited) Sounds great. Let me know how to buy one. I would also be willing to help port the send/receive to a modern OS if nobody has done that yet. I haven't looked at it in years, but was there a reason it was done with parallel instead of serial? Edited February 7, 2014 by R.Cade Quote Link to comment Share on other sites More sharing options...
+Gemintronic Posted February 7, 2014 Share Posted February 7, 2014 Since 7800 dev is going to boom soon I bet Yurkie and others could make some cash offering either the eckhard mod or complete modded out systems. I, for one, wouldn't mind having a stock 7800 and one for dev. Quote Link to comment Share on other sites More sharing options...
Eckhard Stolberg Posted February 7, 2014 Share Posted February 7, 2014 I would also be willing to help port the send/receive to a modern OS if nobody has done that yet. I haven't looked at it in years, but was there a reason it was done with parallel instead of serial?Simplicity and me being bad a soldering basically. The whole DevOS thing started out as a cartridge reader. The RAM carts came later. So at first we only needed to install the new BIOS, which is simple on some PAL systems, and a cable. Since the parallel port uses 5V like the 7800 joystick port, soldering the cable was simple enough for me to do it myself. Also I wrote the code while John did the testing and burned the final EPROMs for me. So having a simple but flexible transfer protocol that didn't need precise timing helped to speed up the development process. I have some serial transfer routines halfway done. I know I always say I'll finish them every time this topic comes up and then never do that, but that is mainly because of all the 2600 dumping routines. Most of them run in the 128 byte RIOT RAM. For some of them space is tight and timing is difficult, so changing the transfer routine to serial might not be possible. That's why I usually give up pretty quickly. If the change is just for the RAMONA RAM cart BIOS, I might be able to finish them this time. Really. Quote Link to comment Share on other sites More sharing options...
jaybird3rd Posted February 7, 2014 Share Posted February 7, 2014 Sounds great. Let me know how to buy one. I would also be willing to help port the send/receive to a modern OS if nobody has done that yet. I haven't looked at it in years, but was there a reason it was done with parallel instead of serial? For speed purposes, I would imagine. There's a limit to how fast data can be reliably transmitted or received through the joystick port, so using a parallel interface instead of serial allows for more efficient transfers. (EDIT: See Eckhard's post above.) It may be possible to upgrade the parallel interface to USB with one of the new USB-to-FIFO bridge chips (here is a development module for one such chip). This would allow a more modern implementation of 7800CTRL on the PC side to use the same protocol, only through USB instead of through the parallel port. I started working on a Java-based replacement for the DOS version of 7800CTRL using the RXTX library, but I've long since lost the code. 1 Quote Link to comment Share on other sites More sharing options...
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