davince

https://www.sellmyretro.com/offer/details/512-ram-expansion%2C-atari-800-xl-61296 is maybe an option?

Thanks for the info! I use MEMRAMCHECKTEST.ATR which does not seem to boot DOS. I managed to workarroound it by booting MyPicoDos and with dat booted I can switch to second disk (MEMRAMCHECKTEST.ATR) and start a program using the cursors. I'll check if MEMRAMCHECKTEST.ATR does have the 'L' option...maybe this will bring me the option to start/load a program.

Does anyone know how to start the progams on disk? If i boot this ATR I see a menu (with return it list the commands) with all kinds of commands. One of them is directory listing.....then i see all kinds of programs i want to start....but I have no clue how to start a program.

Thanks all for the suggestions! I'm going to look into them My goal is to run all those newly demos for Atari (some require 320KB if i'm not mistaken). I do have a SDrive-MAX project ready to try out when I finish the SIO connector. So would both options (syscheck or turbo freezer) be valid for running those demos of a SDrive-MAX? Syscheck is available from Germany...my neighbor So think that is the easiest way. Syscheck ram upgrade uses (only?) RAMBo scheme? Will this be a problem running all available demos?

Is this upgrade still alive? An where can I order one?

The problem with C64 PSU and lm7805 is that over time they output higher voltage, eg. 5.4V which can ruin your system.

As far as my knowledge goes....the problem with c64 PSU (and probably atari's) is that the output voltage gets higher and higher...bricking your system. Can you explain why?

Sorry to bother you all, because maybe this question is answered already, but i couldn't find it. I ordered (by mistake) another board that does not com with Arduino connectors ? I was to busy selecting a screen with ILI9341 chipset. Can i use this board with de SD drive max project? I found this webpage describing the connection: https://educ8s.tv/arduino-2-8-ili9341-tutorial/ Pictures of my board: http://oudespelcomputers.nl/sdmax/2.8inch_tft_touchscreen2.png http://oudespelcomputers.nl/sdmax/2.8inch_tft_touchscreen_pinout.png http://oudespelcomputers.nl/sdmax/2.8inch_tft_touchscreen_schematic.png