tdididit

First try to replace last resistor at output, probably u got 75ohm now. try how console will act with 50ohm and 100ohm. check with multimeeter impedance of cvbs output to ground - should be 75ohm in both modes if it not help, you will need to build SPDT switch circuit - no need to build whole svideo mod. especialy that components used in longhorn videomod are not easy to get ... or just leave it like i used to do

yes I know it because I am using broadcast monitor with 50ohm inputs, so it happend to me in both modes 2n3904 is same like 2n2222 a PNP transistor switch circuit you can find on longhorn videomod (U4 part on schematics). http://longhornengineer.com/images/atarivideomods/design/Atari%207800%20Video%20Mod%20V2_1.pdf FSA3157 in sc70 package can be too small, but you can use CD4052 analog SPDT multiplexer/demultiplexer in place of it. multiplexer will separate MARIA & TIA signals and stop leaking problem, part of Chroma is "eaten" by disabled MARIA in 2600mode

it is normal when you are using 2n2222 videomod. you can try use different cable or by use bit smaller last resistor best medicine for your problem is 2:1 switch to separate TIA & MARIA sync signals

Thanks, as I wrote before till end of this month first batch will be assembled & ready to ship My resources are limited and I can afford only for small batches now (a78-flashcart x10pcs; a78-flashcart+ x10pcs; a78-simpleEPI x10pcs) For sure I will order next batch, but most of people are waiting for my a78-simpleXM cart - I want to show it public in next two months when flashcarts will be well tested and bug fixed Developer team members got priority, they need to get it first in row. Price of a78-simpleXM will be not higher than price of Curts XM module. Best regards

No problem, you was not the only one. I am typical polish and bad comments motivates me to harder work, but you need to realize that it not works same for every person. I know few great designers and coders who quit their work after another "bad blood" comment or AA community is for them the last place where they like to show their work. Same time I want to thank Trebor, Gambler172 and JVas for their help, support and trust. Without them I would be not able to continue my Atari development.

Here is a picture of present beta stage devices. Schematics, pcb layouts and partial firmware code are on git

ROMS are loaded not flashed, from fat32 SD card plugged into Arduino Shield - this shield is connected to Atari joystick port JOY2SD now evolved into simple-EPI device. a78-simpleXM cart will be all-in-one device with SD/USB host controller (keyboard/mouse/usb storage) on cartridge pcb, but I will be able to show XM cart after alpha stage I am publishing my work in github repositories https://github.com/tdididit?tab=repositories

USB-B plug is only for powering and updating Arduino code. top USB-A plug is for keyboard. Device is connected to A7800 via second joy port

Yes, it is main feature of this prototype. New comming designs will have bit more features and tools

What happend? Let me remind you ... ... it is same project

Proto got only 256kB of RAM. a78-flashcart & a78-flashcart+ are bit more advanced. Developer version have 512kB RAM compatible with XBoard & 512kB in-system programmable Flash ROM I will write bit more about them in next two weeks when first batch will be assembled and shipped to the users.

Proto cart is a 256kB RAM expansion. Cart firmware is communicate with peripheral device over second controller port (SD/RTC/Keyboard) you can load a78 image files from SD card using one of applications included in firmware

sadly, there was only two prototypes of 256kB ram carts - both are now in hands of AA members a78-flashcarts are sold too, you will need to wait for next batch when all hidden bugs in firmware will be fixed

this time it is my work mid stage prototype but XM & homebrew games work smooth on it yesterday Gambler172 was testing it, I think he can tell bit more about "user feelings" I can share only some technical details if you like -ps- Tower Toppler works.There was no glue logic issue, only "difficult switch" setting

I just mentioned HSC memory regions can be used many ways Wysłane z mojego X2_Twin przy użyciu Tapatalka

Battery hold real time clock for fat32 timestamps. HSC data can be dumped & reloaded from SD cart Wysłane z mojego X2_Twin przy użyciu Tapatalka

can be bad riot, its 5 bucks only

video mod you installed on top of 74ls32 or you got it on cables ? in my 7800 machines I was replacing only first 2200uF capacitor ... and PSU check is no shortcut - bottom-left part of your picture and fill joins of LS08 you can post component side picture too

you should solder this bad soldered chip in the middle of your picture 74ls08

rework custom chips, but why you were changing oscillator ? If you didnt use original Atari oscillator but cheap chineese it can cause the problem Maria needs special selected oscillator, ask about it at Best Electronics

for ntsc games you will need NTSC MARIA minimum. Maria deciding about tv frame rate and oscillator clock dividing boost is strictly related with tv frame rate you will no need to change oscillators but with NTSC MARIA chip PAL games will slow down choice is yours. most of homebrews are PAL compatible

Yes, there are two hardware registers in CPLD. in ROMpicker mode write into $F000 set rom entry bank (2kB density), write in to $F001 set BS mode 2k/4k/F8/F6/F4, (and still is space for two more ) after setting BS mode value, $F00x hotspots becoming inactive Sorry, for rom picker code quality, it is my very first program for vcs

I did tiny 512kB flash cart for Atari 2600. sources and eagle files are on my git https://github.com/tdididit/a26-flashcart .a26 file contain 4kB rom picker binary rombuilder pc appliation will be soon - WIP a26-flashcart.a26

I was need this tool right now for bing & boings in my game !!!! thanks, you 're man

I made i yesterday https://github.com/tdididit/a52-eaglelbr Greetings