I take it that this resistor needs to be changed to 10K and that this will be the reason the 1MB switch isn't working? 100K is probably fine. Its only a pull up. You could try tagging a 10K across it, but its only a guess as to what your problem is. I can't really think of anything else. A lot of t...

Due to EOL chips https://www.exxosforum.co.uk/forum/viewtopic.php?f=114&t=6961 regrettably some items will have to be put out of production. First up is the ST536. TF536_STV3sm.jpg https://www.exxosforum.co.uk/atari/store2/#0220 At the time of typing there are 20 PCBs left in stock. Considering ...

Most TTL chips aren't being manufactured any more either as the fabs are only interested in high margin chips now. Yeah it's very hard to find TTL chips now. I've been buying tubes of 100 from Mouser for some items to keep stock of what I can. I have been saying for a while that things like the 030...

Even the buffers are now EOL

Just saw in mouser :( Capture.PNG That is pretty much the end of a lot of stuff then. I only use the 144XL on the ST536 / STE536, so I guess for the few which will get built, it will make no odds. But for sure, its the end of a lot of projects for the future :( The 288XL is like £40-£100 now. So I t...

@exxos I'd be keen to build up an alpha. One thought: perhaps the IDE header could be on the bottom side if it interferes with the keyboard or anything else. Assuming it doesn't interfere with anything on the motherboard :) It's hard to say how it will all fit until its built up properly and evalua...

The switch just connects A9 to the RAM which gives you 4MB. With A9 disconnected from the MMU, it will only see 1MB. BUT the RAM side of A9 gets pulled high by the 10k resistor to stop the RAM address line floating. It's odd a link works but not a wire to a switch. Twisting wires and it having that ...

The Internet is my witness that this passed DRC check

I guess it's the first time I have used the regulator as a jumper link before I make myself chuckle sometimes


Feking Eagle again!

andresv wrote: ↑Thu Apr 18, 2024 6:35 pm Sounds really good, so there is some pcb prototype coming up soon?

When I finished the assembly files yes..