tdididit

Specification in attachment in 7800 mode try not use 128bytes of RIOT RAM. it is reserved for 2600 mode SG cart can have 16kB of RAM ($4000-$7FFF), rest is ROM. at $8000-$BFFF bankswitch window (1 from 8 16kB ROM banks), at $C000-$FFFF last 16kB ROM bank 7800_Software.pdf

you should check atari 7800 specification MARIA got tile font based modes and raw graphics modes and large sprites every got its pluses and minuses. 0 color is always transparent, so you can multiply colors by displaying two tiles lying in same place, every layer can use different color set only limitation is size of Display Lists List (DLL) fonts or sprite data can be placed in ROM so same like in NES you can use two or more banks for tiles animation Scrolling is easy, horizontal by screen offset in DLL, vertical by extra Display List entry A7800 got only 4kB of RAM + 128b of RIOT RAM, all the rest you can find in extra hardware 16kB in SG carts 128kB in 8x 16kB banks in XM

Did any of You planning to use 78AB or 78AC bankswitch scheme in new productions? Now only images I have found are: 78AB - F18 Hornet 78AC - Double Dragon and Rampage I need to save one CPLD pin for pokey chip select and it makes that those schemes can hold maximum 128kB of flash memory (in other schemes can use full 512kB of Flash ROM and 128kB of XRAM / 112kB if HSC cart is enabled). Is it acceptable for you ? Thanks for any answer

Image files loader works https://www.facebook.com/sebastian.kotek/videos/vb.1403950705/10208516357772146/?type=2&theater&notif_t=video_processed

You are right. RAMcart ROM contain communication program and file picker. PS2 keyboard is a addon feature, you can still use joystick in menu if you like to upload and play games only There is no LPT connection, only Arduino with shield (everybody got one dusty Arduino in drawer). This Arduino replacing old PC and its hard drive Thing what makes it different is that JOY2SD acting more like disk drive (you can load, save and remove files, read, create and remove directories on card). Atari is sending commands to JOY2SD device, not only waits what "old PC" will want to do, like it was with LPT cable Only common between LPT and JOY2SD is that both using 3 bit frame communication method.

resistor stay on place, and please, short those naked cables. it will make a shortcut

Audio signal should be on R33 right pad, try to connect it direct to output plug

you need just one, check my first picture. you need connect R33 & R32 right pads with it (the two resistors you have removed) , then your audio output will be at right pad of R33 keep my fingers crossed

Audio is not broken !!! you just unpluged it when you removed R32 resistor Regards

And don't worry Everybody was a rookie first I didnt get my skills from school too Here is a picture of PAL 7800 mainboard prepared for heavy hardware mod I just finished de-soldering work

buy any 47Kohm resistor. now you will not have sound on RF too bc you have removed R32 and R33 my audio out was soldered to R33 (right side) now I am using audio out from cartridge thats why you not see cable there. In recipient atari 7800 schematics - should be helpfull 7800.zip

try add 47K resistor betwen R33 & R32 and then take audio from R33 you can remove RF modulator too dont touch potentiometers / brown glue is only to keep factory setting On picture you can see my COMPOSITE mod

PS2/USB keyboard works with ProSystem now https://www.facebook.com/sebastian.kotek/videos/10208502954157064/?pnref=story

Maybe, but it is all your fault I started this project when I lost hope to buy your kit. I realy want to finish my port of Robbo and few other 7800 games I started

It is SDcard drive & PS2/USB keyboard interface plugged to second JOY port. Second part of set is moddified devcart, I am sure that there will be possibility to use it with CPUWIZ devkit, if he put communication routines into his devkit cart ROM You will be able to upload A78 images to play games but it is not all In new applications you will be able to load&save files, create directories or remove no needed files from card. I always preffered to draw fonts, draw pictures, compose music on real hardware With 101-keys keyboard it will become real Created files and directories will get actual timestamps thanks to DS1307 Real Time Clock included on drive board In applications you will be able to use RTC time too.

PM me I sended order to PCB factory. If you like one set I can ask about one more boards set

On my github You can find some tools I wrote and using it in this project here is memory monitor --> https://github.com/tdididit/a78-tinymon should work on NTSC machines too.

JOY2SD Arduino Shield is ready and ordered too I have got two weeks to write tiny DOS to show how SD disk and keyboard working together

Small UPDATE I have modified memory manager part of cartridge. It use Atari SuperGame Hostspot: bit 7 - BIOS Eneble bit 6 - reserved for extension boards (dualPokey, dualSid, VIA2SD) bit 5-3 - RAM_LO bank ($4000-$7FFF) bit 2-0 - RAM_HI bank ($8000-$BFFF) Highest RAM_LO bank mapped in handler region ($1000-$17FF as RAM / $3000-$3FFF as ROM) ( Note: I am not calling it HSC region because I want to use it to load and store for an example tiny DOS, memory monitor or disassembler ) after upload 4kB HSC ROM game detect it and saving scores Highest RAM_HI bank mapped at $C000-$FFFF as ROM Memory with CR2032 battery backup BIOS contain: JOY2SD image loader, handler loader, memory monitor, RTC settings, self test I loaded with success 7816, 7832, 7848, 78SG, 78S9 images I am still fighting with my beloved Tower Toppler what is 78S4 and not start properly :/

As I wrote before, firmware should be ready next week. Cart BIOS is almost done Interface will be availiable as a Arduino shield and device with microcontroller. Here are pictures of working prototypes

Interface should work on any platform with DB9 joystick port. It works in pair with my moded RAMONA DEVCART. Here are early 3D visualizations of Arduino Shield and RAMONA CART Present prototypes looks bit different (shield got DS1307 RTC on board for an example )

Hi, I will, but first I need to test it. I think next week first beta firmware will be ready. Thanks for good word

I am working now with SDcard interface. Not much code left to do but I have some questions to ProSystem users - Did short filenames 8+3 will be enough to make device usable? - Did 1638,4 bytes per second is fast enough ? 16kB game image load in 10sec. Thanks in advance for answers here is video from Centipede image upload test https://www.facebook.com/sebastian.kotek/videos/10208456794283096/?pnref=story

MADS 7800 macro file got some bug. here is working version ********************************************************* * MARIA MACROS FOR EASIER GRAPHICS CONSTRUCTION * ********************************************************* * * *this macro constructs a 4 byte header for display lists * .macro header ; address palette width hpos .byte [:1 & $FF] ; .byte \address & $ff .byte [(:2 * $20) | ($1F & (:3 ^ $FF))] ; .byte (\palette*$20) | ($1f & -\width) .byte [:1 >> 8] ; .byte \address >> 8 .byte :4 ; .byte \hpos .endm ; ;this macro constructs a 5 byte header for display lists ; .macro xheader ; address,palette,width,hpos,wm,ind .byte [:1 & $FF] ; .byte \address & $ff .byte [(:5 * $80) | $40 | (:6 * $20)] ; .byte ((\wm*$80) | $40 | (\ind*$20)) .byte [:1 >> 8] ; .byte \address >> 8 .byte [(:2 * $20) | ($1F & (:3 ^ $FF))] ; .byte ((\palette*$20) | ($1F & -\width)) .byte :4 ; .byte \hpos .endm

i've found a bug in my maria macro files :/ it took some time, but now will be without blinking I am still working on it