Atari 800xl Shift Key Not Responding

[Atari 800xl Shift Key Not Responding]

some people have repaired them using conductive silver paint

[Atari 800xl Shift Key Not Responding]

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

 

[Cartridge PCBs similar to the ones made by Atari]

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

[Anyone got a spare keycap for 400 B-Key keyboard?]

the 3d  print file is here:

https://www.thingiverse.com/thing:3626216

where are you located?

[Atari 800xl Shift Key Not Responding]

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

[Cartridge PCBs similar to the ones made by Atari]

16 hours ago, lbaeza said:

same dimensions

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/

[Venture Official Release]

Just now, xxl said:

let them record own review.

and await the personal abuse from the author 😁

[Venture Official Release]

58 minutes ago, Marius said:

seems to conclude that there is some conspiracy going on against them.

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 😁

[Pondering About Max's - Longplay]

great fun!

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

[Faulty RAM on 800XL - what ram to buy]

On 10/13/2020 at 5:18 PM, ok1rp said:

After few days of proper working

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

[800XL SIO port stopped working]

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..

[I think I fried my 800XL...]

Huzzah!

theyre made of tough stuff! 😁

[8bit Abbayes des Morts Possible?]

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

[Who started shipping candy??]

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

[Atari 1400XL debugging]

glad you got the thing sorted! 😎

people obtain DRAMs from ebay and aliexpress

[Reapply/Replace cartridge stickers]

5 hours ago, Shanez1998 said:

a resource for a new one

try here:

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

 

[Help me! I’m stuck! Atari 400 repair]

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

[Atari 1400XL debugging]

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

[400 32k RAM board help needed]

On 9/21/2020 at 1:11 PM, ClausB said:

Some 32K boards aren't meant to work in a 400:

https://atariage.com/forums/topic/177885-atari-800-ram-selection/?do=findComment&comment=2225206

 

I have an Axlon RAM-CRAM for my 400 and a schematic I could photograph.

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

[800XL Repair]

A ROM can be replaced with an EPROM if have a burner?

RAM chips can be piggybacked to identify the faulty culprit

[FS: All Kinds of ATARI Stuff - New Items Added]

2 hours ago, Humblejack said:

No, Utah USA

Aw horse-apples!

thanks anyway 😁

[800XL with Mystery (to me) Daughterboard]

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.

[400 32k RAM board help needed]

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!

[FS: All Kinds of ATARI Stuff - New Items Added]

UK?

[Weird 800 xl problem....any advice?]

another vote here for antic