rarefluid

Great news. Will surely order in the next days!

Yeah! That's great news! @mitch: I got the devcart PDF from that site. I wanted to do a different layout though containing extra RAM, SRAM (for development) and a POKEY. Maybe someone could tell me if my idea is feasible or I have overlooked something important. Oh, and my composite-video-out board is working now! \o/

There should be ROM (or SRAM for development) on it too... And it doesn't have to be compatible with existing game cartridges... Why can't one have a POKEY and RAM. Is it because the adresses both lie in the first 16k? EDIT: I understand now. The pokey is at $4000-$7fff, but is using only the lower 4bit of the adress (16 bytes). There usually is the expansion RAM too, though... How about having a simple adress selector selecting between the pokey and the ram? Checking if A14 & (A0 | A1 | A2 | A3) == 1 (connect to CS1, CS0 already connected to A15) and then enabling the POKEY should work. This way you'd only loose 16 bytes of the 16kB of RAM and you cold still do regular bank switching. Or is there something I'm missing? Doesn't Commando already do something like this, only using a ROM chip?

Hi all. I'm currently playing around with my 7800 which has been sitting in the corner for a few years now (bought a broken one off ebay and repaired it). Now I want to build a dev cart of some sort and do some homebrew stuff. I found the Eckard Stolberg site and want to install an EPROM with DevOS on it. I already built a parallel-joystick USB interface cable using the FTDI FT245R chip (UM245R). I'm also waiting for components for my composite-out board to attach a mobile tft screen (I know, pics or it didn't happen, but they'll come when the mod's done...) What I still need though: - One (2-4 would be neat) EPROMs (4k, 8k, whatever) flashed with the newest DevOS. I have no EPROM programmer though... Is someone selling those or providing flashing services? If I buy them off the internet (www.arcadecomponents.com) they charge 10$ PER EPROM, which easily amounts to a programmer if you buy more... - Advice on what dev cart to build. I would love to have RAM, but I'd also love to have a POKEY chip... There are some cart designs that have POKEY chips (ballblazer style, or even commando with up to 512k), but no RAM and vice-versa... I managed to get hold of a Commando cartridge, but would hate to tear it apart for this :´( - Is there some ready-made cart design available as PCB or layout file (EAGLE?) that has a POKEY and RAM? I saw cpuwiz had a Commando PCB layout lying around... Any chance on getting that one as source files? I know that there are the 32k carts in the shop here... - If I have to design/manufacture some carts/PCBs myself. What do I have to watch out for? Board thickness 0.8mm, mem chip timings, blabla... Are there any prepared EAGLE library files (e.g. cartridge connector) that I could use? - Cheap and complete source for components. I tried Reichelt.de in Germany, but they don't have POKEYs and so on... Thanks for bearing with a newbie through this whole post Kim