Search found 260 matches

by tzok
Thu Dec 13, 2018 9:44 pm
Forum: H4 MONGREL EDITION DEVELOPMENT & INFO
Topic: POWER CONNECTORS
Replies: 16
Views: 8261

Re: POWER CONNECTORS

I personally dislike the whole idea of STF remake, but I guess adding an ATX connector (possibly with angular header) to use pico-PSU modules would be a very useful solution. Power output connectors on motherboard are obsolete then, as Pico-PSU has a cable to connect FDD power.
by tzok
Sun Dec 02, 2018 4:29 pm
Forum: ELECTRONICS
Topic: Logic Analyser on the Cheap
Replies: 32
Views: 21833

Re: Logic Analyser on the Cheap

Recently I was trying to diagnose my... diagnostic cart with a Logic Analyzer (Logic-8 clone). I did it, but not in the way I'd like to. All lines were looking legit on the LA software, but I realized that, with probes connected, cart behaves differently. So I started disconnecting the probes, one b...
by tzok
Sun Dec 02, 2018 4:17 pm
Forum: ELECTRONICS
Topic: Lead-free soldering
Replies: 46
Views: 22040

Re: Lead-free soldering

I find lead free solder fine for a new stuff, but not for repairing old one. I would't care about inhaling lead, as it almost doesn't vapor during soldering. What is really toxic are the vapors of flux. I'm using Sn60Pb40 with SW26 flux and lead free Sn99Cu0.7Ag0.3 with 1.1.3 flux (1.1.3 a.k.a. SW-2...
by tzok
Thu Nov 29, 2018 9:31 am
Forum: ROM UPGRADES
Topic: STF 6 CHIP ROM LOCATIONS
Replies: 1
Views: 3714

Re: STF 6 CHIP ROM LOCATIONS

This is a TOS ROM chip layout for 520ST:
520ST ROM layout
520ST ROM layout
520ST.jpg (252.64 KiB) Viewed 3044 times
by tzok
Sat Nov 24, 2018 2:56 pm
Forum: ATARI FOR SALE & WANTED
Topic: FOR SALE STF/E KEYBOARDS (UK)
Replies: 60
Views: 33405

Re: FOR SALE STF/E KEYBOARDS (UK)

I got keyboards form Chris. Some were very dirty, but all except one were working, yet most of them required re-soldering of a mouse port. It was a good buy. I've made some observation - one of these keyboards had a base frame with additional "bumps", yet all had the same PCB and all were ...
by tzok
Thu Nov 08, 2018 7:55 pm
Forum: PSU (power supplies)
Topic: Replacement PSU for STf/STe
Replies: 1
Views: 2515

Re: Replacement PSU for STf/STe

I have found even a better one - Mean Well RD-50A. This is only +5V/+12V (without the -12V line) switchmode PSU. It's not on the photo, but I've already added the PE wire:
2018-11-05 18.09.41.jpg
2018-11-05 18.09.41.jpg (92.56 KiB) Viewed 2414 times
It is mentioned there: https://www.exxosforum.co.uk/forum/viewt ... f=9&t=1320.
by tzok
Tue Nov 06, 2018 7:47 pm
Forum: HARDWARE DISCUSSIONS
Topic: 520ST small model w/ no floppy / general advice
Replies: 22
Views: 10309

Re: 520ST small model w/ no floppy / general advice

AFAIK you can use a Gotek as an external drive, but I would suggest you ask around the forum to see if anybody else has done this with an original 520. I have Gotek (HxC USB) in the external enclosure, I tried it on the 520ST and it works fine. Using Gotek in Atari ST DD interface mode you can use ...
by tzok
Mon Nov 05, 2018 10:24 pm
Forum: PSU (power supplies)
Topic: Jan Beta Mega ST
Replies: 8
Views: 5884

Re: Jan Beta Mega ST

Keyboard is not original, I've replaced the LEDs in it, because the case I had has the red filters in it (and green LED + red filter = no go) and actually the board and top case are probably an original pair (bottom part is not), but the original floppy is dead, and I got it without the keyboard (th...
by tzok
Mon Nov 05, 2018 6:32 pm
Forum: PSU (power supplies)
Topic: Jan Beta Mega ST
Replies: 8
Views: 5884

Re: Jan Beta Mega ST

As I've promised - I've tried, and it fits: https://obrazki.elektroda.pl/9182226600_1541442719_thumb.jpg The unloaded 12V is slightly too high (over 13V), but I don't care as it is not used anywhere on the board (it is only for the FDD motor). It fits really tight, but without any modifications, but...
by tzok
Sat Nov 03, 2018 11:59 pm
Forum: PSU (power supplies)
Topic: Jan Beta Mega ST
Replies: 8
Views: 5884

Re: Jan Beta Mega ST

If I've managed to fit RT-65B (but without it's case), so the smaller RD-50A should easily fit... I've already ordered it and I'll check this soon. I've ordered from a local distributor (TME.EU), and there was almost no difference in price with Aliexpress :/ I've paid ~20€ incl. VAT & PP. Quite ...

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