Search found 576 matches

by 1024MAK
Thu Sep 22, 2016 1:26 pm
Forum: Hardware
Topic: New 1040STF with a Bum Keyboard
Replies: 5
Views: 1172

Re: New 1040STF with a Bum Keyboard

Which keys?

Do you have a digital multimeter, or access to one?

Mark
by 1024MAK
Thu Sep 22, 2016 11:51 am
Forum: News & Announcements
Topic: exxos's webshop forcefully shutdown :(
Replies: 139
Views: 23532

Re: exxos's webshop forcefully shutdown :(

Hello Chris

Sorry to hear about the trouble you have been and are having.

Late to the party, but maybe you would like to take a look at this site: http://sellmyretro.com/

Mark
by 1024MAK
Thu Sep 22, 2016 9:57 am
Forum: Website Discussions
Topic: "Remember me" is not remembering me very well.
Replies: 12
Views: 7426

Re: "Remember me" is not remembering me very well.

I think there is a problem if you use more device on different networks (eg mobile phone and computer or computer on work). No, I don't think so. I use other phpBB forums and have been logged in using two different PC's and a iPad mini all at the same time and it worked okay (in this example it was...
by 1024MAK
Thu Dec 24, 2015 3:13 pm
Forum: News & Announcements
Topic: A very Merrey DAD-mas!!!!!
Replies: 6
Views: 2723

Re: A very Merrey DAD-mas!!!!!

To All

Christmas merry very :lol:

Many happy retro wishes :D

Year, new, good to you too :mrgreen:

Mark

PS I may have been reading too many "translated" "instruction" "manuals" :P
by 1024MAK
Sun Oct 25, 2015 1:03 pm
Forum: Website Discussions
Topic: Who nicked the "Summer Time/DST is in effect" radio button?
Replies: 0
Views: 3021

Who nicked the "Summer Time/DST is in effect" radio button?

Who nicked the "Summer Time/DST is in effect" radio button? Now to change back to GMT/UTC I have to put more effort in scrolling through a list :-( It's Sunday, and I'm suppose to be allowed to be lazy :mrgreen: <Wanders off still moaning about having to scroll instead of just click...> Ma...
by 1024MAK
Tue Sep 08, 2015 10:12 pm
Forum: Hardware
Topic: 520ST original - what power supply voltages _needed_?
Replies: 28
Views: 6954

Re: 520ST original - what power supply voltages _needed_?

Ahh, I'm sure when I looked at the schematic that was posted earlier in the thread (I'm on an iPad, so can't look at the copies on my computer) there was a buffer amplifier transistor with it's collector connected via a resistor to +12V. But on the schematic just posted, this is a +5V supply. Also t...
by 1024MAK
Tue Sep 08, 2015 8:05 pm
Forum: Hardware
Topic: 520ST original - what power supply voltages _needed_?
Replies: 28
Views: 6954

Re: 520ST original - what power supply voltages _needed_?

Yes, all the logic chips in an Atari ST only need the +5V.
Older FDD need +5V and +12V. Newer FDD only need +5V.
The serial port needs +12V and -12V. But the -12V is internally generated from the +12V rail by a converter/inverter.
The audio circuits need look to be using the +12V supply.

Mark
by 1024MAK
Tue Sep 08, 2015 7:57 pm
Forum: Hardware
Topic: DMA & Floppy issues on STFM modification
Replies: 29
Views: 7918

Re: DMA & Floppy issues on STFM modification

Tri-state buses will appear to "float" with maybe slow rise or fall waveforms when there are no outputs driving the bus (a parasitic capacitance effect). In some designs the manufacturer/designer uses pull-ups or pull-downs. While others don't use any. So in order to make sense of what is ...
by 1024MAK
Tue Sep 08, 2015 7:42 pm
Forum: Hardware
Topic: 2 Faulty drives or Faulty ST ?
Replies: 6
Views: 1966

Re: 2 Faulty drives or Faulty ST ?

The Atari STFM and STE etc use a switched mode power supply unit (SMPSU). These work the capacitors that perform the smoothing of the supplies very hard. A symptom of degraded, life expired capacitors is the supply voltage dropping when extra current is required. While the SMPSU can cope with just t...
by 1024MAK
Mon Sep 07, 2015 3:47 pm
Forum: Hardware
Topic: 4MB Upgrade & 16MHz Booster progress
Replies: 714
Views: 85183

Re: 4MB Upgrade & 16MHz Booster progress

Post delivered on a Sunday 8O

Mark
by 1024MAK
Sat Aug 22, 2015 10:51 pm
Forum: Hardware
Topic: Help me identify some mystery cables
Replies: 4
Views: 2022

Re: Help me identify some mystery cables

MIDI is just a type of serial port. Some serial ports on other devices can communicate at MIDI port speeds. Serial ports to RS232 or similar come in all shapes and sizes, so who knows. I agree that the bottom cable, the way the 25 way D- connector is wired looks like serial port wiring, complete wit...
by 1024MAK
Sat Aug 22, 2015 10:45 pm
Forum: Hardware
Topic: ST PSU repair bridge rectifier question
Replies: 1
Views: 1073

Re: ST PSU repair bridge rectifier question

Full wave, single phase, four leg type (two AC inputs, one + output and one - output).
Suggest a 2A or 3A type, with a PIV of 1000V.

Pin-out may be different, so check. Also you may need to make the holes in the pads of the PCB slightly bigger with a small drill.

Mark
by 1024MAK
Fri Aug 14, 2015 2:00 pm
Forum: MiST
Topic: Acorn Archimedes
Replies: 103
Views: 29596

Re: Acorn Archimedes

From StarDot (*.) Forum :- I've just posted on Youtube an invitation to the person (I think it's him) who had MIST work as an Archie to join us here on *. Could sbdy subscribe to the Atari forum to post the same invitation to join us ? http://www.atari-forum.com/viewtopic.php?t=27637 I can't post an...
by 1024MAK
Thu Jul 30, 2015 6:55 am
Forum: Hardware
Topic: New to this, monitor suggestions?
Replies: 5
Views: 1970

Re: New to this, monitor suggestions?

In general, SCART sockets are only provided on TVs in the European market. And some large screen LCD TVs no longer have the conventional SCART socket. Instead you have to use an adaptor lead. However, if you know what you are doing, you can construct a custom cable and a sync converter board and fee...
by 1024MAK
Wed Jul 29, 2015 9:46 am
Forum: Hardware
Topic: New to this, monitor suggestions?
Replies: 5
Views: 1970

Re: New to this, monitor suggestions?

@ WalnutSpice - can you solder?

Mark
by 1024MAK
Sun Jul 26, 2015 6:31 pm
Forum: Hardware
Topic: 1040 STF repair help
Replies: 18
Views: 5506

Re: 1040 STF repair help

If we consider the [cost of renewing the electrolytic capacitors on the motherboard] vs. [the hassle of fault finding], clearly for lazy people like me, it's better to renew said capacitors regardless ;). In any event, electrolytic capacitors degrade over time, this is a known failure mode... So bet...
by 1024MAK
Wed Jul 22, 2015 11:45 am
Forum: Hardware
Topic: Non-working floppy disk drive
Replies: 19
Views: 11531

Re: Non-working floppy disk drive

56uF is not a common value. Assuming it is not used for any timing function (unlikely), try using either a 100uF or a 47uF. Also use low ESR types.

Mark
by 1024MAK
Sat Jul 18, 2015 8:26 am
Forum: Hardware
Topic: Atari 1040ST black screen
Replies: 11
Views: 2672

Re: Atari 1040ST black screen

Tell us more about the TV or monitor you are using. What type (CRT, LCD, other?), What make and model? Does it work with other computers or DVD players? When using the SCART AV input, have you tried going to the settings menu or if the remote control has the controls, selecting RGB mode, "PAL&q...
by 1024MAK
Sat Jul 18, 2015 7:36 am
Forum: Hardware
Topic: Speed Ultrasatan SDCARD
Replies: 5
Views: 1963

Re: Speed Ultrasatan SDCARD

Um, you do realise that the limiting factor here may just be the late 1980's computer... Most, if not all currently available SD cards (or CF cards) are going to be much faster than the STe can actually read from. So it does not matter how fast the card is, it is the rate at which the STe can read t...
by 1024MAK
Thu Jul 16, 2015 11:51 am
Forum: Hardware
Topic: Odd FDC Fault
Replies: 6
Views: 2716

Re: Odd FDC Fault

It could be the capacitors that provide the +12V supply in the PSU need replacing. But due to the age of the PSU, it's best to renew all the electrolytic capacitors in the PSU. BUT before you plug in your soldering iron, if you have a working STFM or STe, swap the PSUs around and see if the fault fo...
by 1024MAK
Sat Jul 04, 2015 3:21 pm
Forum: Hardware
Topic: STE 3 or 11 bombs on boot
Replies: 21
Views: 7592

Re: STE 3 or 11 bombs on boot

How is the IDE interface fitted?

Could the problem be due a poor contact caused by the installation of the IDE interface?

A poor contact often results in random errors.

Mark
by 1024MAK
Fri Jun 26, 2015 1:51 pm
Forum: Hardware
Topic: Buffering the cartridge port
Replies: 36
Views: 11568

Re: Buffering the cartridge port

It's due to way Atari implemented the cartridge port. It was after all only designed to take plug in cartridges that only contained ROM (or EPROM) chips, so there was no requirement to do anything other than read data from it. As far as I am aware, all commercial devices that were sold that plugged ...
by 1024MAK
Wed Jun 24, 2015 6:13 pm
Forum: Hardware
Topic: Buffering the cartridge port
Replies: 36
Views: 11568

Re: Buffering the cartridge port

The Atari ST cartridge port lacks the correct control signal to enable the data bus to actually work bidirectionally. So normal writes to the cartridge port cannot be detected by anything plugged into it. However, there is a work around. Use some of the address lines to send data to the cartridge. S...
by 1024MAK
Tue Jun 23, 2015 8:19 am
Forum: Hardware
Topic: Buffering the cartridge port
Replies: 36
Views: 11568

Re: Buffering the cartridge port

A bit of clarification... In this application, it makes no difference if 74LSxxx or 74ALSxxx chips are used. 74ALSxxx are slightly better, but this makes little difference in practice. 74HCTxxx are CMOS versions that should work okay in TTL logic systems (but in some applications have caused odd err...
by 1024MAK
Tue Jun 23, 2015 7:09 am
Forum: Website Discussions
Topic: Forum very slow
Replies: 23
Views: 12473

Re: Forum very slow

I'm thinking that there is a patten forming, the slow operation looks like it is happening for a few days at around the same time of the month. Is the forum female 8-O :roll: :lol:

Anyway, after trying off and on for a few days, I can finally access the forum again :D .

Mark

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