Search found 7 matches

by aszasza
Mon Jan 20, 2020 9:48 pm
Forum: Hardware
Topic: Atari STFM dead
Replies: 17
Views: 3845

Re: Atari STFM dead

Turns out that this machine once belonged to the band Apollo440 or @440 if anyone wants to know. Probably the first few of their albums was made using this very machine. Cool huh? :)
by aszasza
Sun Jan 19, 2020 7:13 pm
Forum: Hardware
Topic: Atari STFM dead
Replies: 17
Views: 3845

Re: Atari STFM dead

Very useful info, thank you! I'll get the proper part than. I've soldered a turned pin socket for it so its gonna be easy to swap it.
by aszasza
Sun Jan 19, 2020 7:04 pm
Forum: Hardware
Topic: Atari STFM dead
Replies: 17
Views: 3845

Re: Atari STFM dead

Is it? I've never came across any processor(I've only worked with microcontrollers) that can drive the reset line, its always a high impedance input only. What else is driving the reset line in the ST apart from this chip? And why? :D
by aszasza
Sun Jan 19, 2020 5:34 pm
Forum: Hardware
Topic: Atari STFM dead
Replies: 17
Views: 3845

Re: Atari STFM dead

I just had a 7414 in my random parts bin so used that instead. I don't really get why they used an open collector inverter, the one I used is actively driving the reset line high or low and it works just fine of course. Maybe the 7405 was cheaper back than?
by aszasza
Fri Jan 17, 2020 3:48 pm
Forum: Hardware
Topic: Atari STFM dead
Replies: 17
Views: 3845

Re: Atari STFM dead

Okay I found it, it was the 47hctls05 inverter ic in the reset circuit. Don't know how it died but replaced it and everything is ok now.
by aszasza
Wed Jan 15, 2020 10:45 pm
Forum: Hardware
Topic: Atari STFM dead
Replies: 17
Views: 3845

Re: Atari STFM dead

Thank you for the answers! Black screen on a b&w high res atari monitor, no beeps on keypress. 5V ok, pin15: well, its 8mhz spot on but more like a triangle wave instead of square, and not a full 5V swing. Halt/reset both low-ish, i can see some very little change when pressing the reset button but ...
by aszasza
Mon Jan 06, 2020 10:13 pm
Forum: Hardware
Topic: Atari STFM dead
Replies: 17
Views: 3845

Re: Atari STFM dead

Hi all, newbie here so much so that I've never actually used any ataris, never had one but I just recently found an 520 STfm it was left behind on the new place we have moved in. I'm an electronic enthusiast so I was quite happy to see one of these pieces of computer history and of course wanted to ...

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