xrbrevin

some people have repaired them using conductive silver paint

Here is the keyboard schematic, It shows only 1 instance of 'Shift' so the keys must be wired in parallel with one another. If only 1 shift key is faulty then i would check conductivity of that plunger, if both are faulty then check pins 8 and 19 of the keyboard cable

oshpark is expensive, JLCPCB is much better value for quantity and price

the 3d print file is here: https://www.thingiverse.com/thing:3626216 where are you located?

check the pins within the keyboard ribbon slot - sometimes they get pushed back which causes poor contact

the pixels past cart uses the same dimensions but it is not commercially produced, instead it is hobbyist/homebrew spec: http://www.grandideastudio.com/pixels-past/

and await the personal abuse from the author 😁

either a baseless attempt to distract people from the real reason(s) why there is negativity or a textbook paranoia case from someone who knows their behaviour is not entirely 'wholesome' ..or both? V61s product range has a few attractive items but the pricing just motivated me to learn how to make my own carts 😁

great fun! not an easy game so its a delight to see it played well 😁

since it worked properly for a while, i would consider the power supply or GTIA/ANTIC issues. check the output voltage is not too high or too low - try another PSU if you have one. Any socketed chips ought to be removed and all contacts cleaned with contact cleaner

sounds like the sdrive Max is getting power but no signal check the middle pin on the bottom row of the SIO port (it is named 'command') and any associated components. if nothing looks damaged, maybe the chip that manages the SIO port could be the culprit? The PIA chip pin 19 is listed as 'SIO Command' but im sure the pokey chip also has some influence over the port..

Huzzah! theyre made of tough stuff! 😁

yes the spectrum ports are great but i find it ironic that the coding originates from a Z80 computer and not a 6502 one..! 🤔

I bought some motorcycle parts from a seller in finland and got some licorice pipes

glad you got the thing sorted! 😎 people obtain DRAMs from ebay and aliexpress

try here: https://atari8bit.net/projects/cart-labels/

do you have another 16k memory module to swap in?

would the sys-check device by @tf_hh work on the 1400XL? if so its a worthwhile purchase

thanks for the response. if you could upload the schematic that would be great. I am aware that a number of DRAM pins are common between the whole group but some are not. Id just like to be as clued as poss before getting the multimeter out

A ROM can be replaced with an EPROM if have a burner? RAM chips can be piggybacked to identify the faulty culprit

Aw horse-apples! thanks anyway 😁

Very homebrew looking indeed but high speed SIO is a great mod! Is the 800XL an 800XL'F' model? i.e. it uses the Freddie chip for memory management? I only ask because i spotted the mysterious plastic blanking plate at the back of the case that the F models seem to have.

I am trying to revive an aftermarket 32k RAM board for my 400. It is the type that uses 16x 4116 DRAMs. I desoldered and socketed all the chips and found 1x 4116 chip was at fault. My TL866 EPROM programmer says that all the 74LS chips are good but the board still fails to boot. As these PCBs are not the best quality, I'm wondering if I lifted a track that would need to be bridged. Does anyone have a schematic diagram for a 16x 4116 chip type 32k board? I need to do continuity checks across the DRAM pins but i could do with some knowledge before I commence. Thanks in advance!

UK?

another vote here for antic