Search found 1368 matches

by Chandler
Thu Mar 12, 2020 11:13 am
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

4.19V
by Chandler
Wed Mar 11, 2020 9:13 am
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

Jeez my mistake again! forgot how to count IC pins :? These are correct! 7406 socket pin 7 with the 7406 fitted - 0.00V 7406 socket pin pin 14 with the 7406 fitted - 5.03V 7406 socket pin 5 with the 7406 fitted - 4.93V 7406 socket pin 6 with the 7406 fitted - 0.07V 7406 socket pin 9 with the 7406 fi...
by Chandler
Tue Mar 10, 2020 9:29 pm
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

7406 socket pin 7 with the 7406 fitted - 0.00V 7406 socket pin pin 14 with the 7406 fitted - 0.05V 7406 socket pin 5 with the 7406 fitted - 4.93V 7406 socket pin 6 with the 7406 fitted - 0.07V 7406 socket pin 9 with the 7406 fitted - 4.97V 7406 socket pin 8 with the 7406 fitted - 5.02V 7406 socket ...
by Chandler
Wed Mar 04, 2020 8:31 pm
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

The new 7406's arrived today, tested - same :x

I will do the suggested voltage tests when i next have a chance..
by Chandler
Mon Mar 02, 2020 9:42 pm
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

Just bought some more 7406 that will arrive this week as the others were lost in post!

OK so did the 2 tests

-Temporarily short the 7406 pin 8 to 7406 pin 13, try your loop test. Fail
-Temporarily short pin 5 of the MIDI OUT socket to 7406 pin 13, try your loop test. Fail
by Chandler
Sat Feb 29, 2020 3:07 pm
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

Oops my mistake as I counted the IC pins wrong :oops:

The test cart midi test passes with both tests

Remove 7406 (IC301) and link pins 5 and 13 - pass

Removed this link

Then added link from pin 2 and 6 on the 68B50 - pass

So midi test is ok with these 2 tests
by Chandler
Fri Feb 28, 2020 9:56 pm
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

Yes the correct 68B50's are fitted https://i.ibb.co/TLgtXJ9/mega-STE-no-midi.jpg Yes the keyboard works fine OK so i soldered a link from pin 2 to pin 6 on U303 and YES! it passes (good news?) I have this Logic Probe, is it any use?! https://i.ibb.co/fXRNvfs/LP-1.jpg https://i.ibb.co/dfX2jPd/LP-2.jpg
by Chandler
Wed Feb 26, 2020 7:17 pm
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

Chandler, referring back to the diagram segment I posted earlier - remove the 7406 (IC301) and join IC301 socket pins 5 and 13 together temporarily. This will have the effect of looping the 6850 output directly back to the 6850 input. Does your MIDI loop test work then? If it does, the problem is s...
by Chandler
Sun Feb 16, 2020 10:30 am
Forum: Hardware
Topic: Modern replacement psu for Tt030 / Mega STE
Replies: 11
Views: 975

Re: Modern replacement psu for Tt030 / Mega STE

Sometimes it's not just caps on these PSU's that fail

I've repaired a few that had blown transistors etc, usually though several parts get taken out at the same time like a domino effect
by Chandler
Sun Feb 16, 2020 10:25 am
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

Am waiting for a new 7406 chip, after that i have no idea :shrug: Following the series signal out from the 6850 and back (by checking for continuity along the signal paths) will return normal results even if you have one of the MIDI input or output connections shorted to 0V by a faulty T-Filter. Fo...
by Chandler
Sun Feb 16, 2020 10:21 am
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

charles wrote:what about corrosion or connectivity at port pins...no rust corrosion or bad connection within the midi port terminals?
I believe u would have checked this first anyhow.


Yes you're right i did check the ports first, no corrosion, so bad solders and no black tarnishing from age
by Chandler
Sat Feb 15, 2020 9:07 am
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

I use a Mega STE diagnostics cartridge with the midi loop cable (any midi cable will do) and it says no midi with M0 code

I have other Mega STE's and they all work fine with the diagnostic cart and loop cable

It's definately a board issue
by Chandler
Fri Feb 14, 2020 10:36 pm
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

No time at present, however i did spend another hour on it with a meter tracking the signal from the schematics out of the 6850 and back into it and all seemed ok?! and compared the results with a working board

Am waiting for a new 7406 chip, after that i have no idea :shrug:
by Chandler
Mon Feb 03, 2020 9:43 am
Forum: Hardware
Topic: Compo software dual tos 1.62 / 2.06 rom images - where to find?
Replies: 30
Views: 2935

Re: Compo software dual tos 1.62 / 2.06 rom images - where to find?

OK well i followed exactly as said by Siriushardware but sadly it didn't work fully, the TOS 1.62 worked but not 2.06, just a black screen on high res or white screen on TV with the TOS 2.06 switch flipped However! I downloaded the files provided by tzok and copied them to a pair of roms and it work...
by Chandler
Thu Jan 30, 2020 11:26 pm
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

Could you explain please Charles what you mean by "did u check the buffer using iorec ?"
by Chandler
Thu Jan 30, 2020 11:20 pm
Forum: Hardware
Topic: Compo software dual tos 1.62 / 2.06 rom images - where to find?
Replies: 30
Views: 2935

Re: Compo software dual tos 1.62 / 2.06 rom images - where to find?

If i click on the EDIT menu there is nothing, like there is no menu!
by Chandler
Thu Jan 30, 2020 11:19 pm
Forum: Hardware
Topic: Compo software dual tos 1.62 / 2.06 rom images - where to find?
Replies: 30
Views: 2935

Re: Compo software dual tos 1.62 / 2.06 rom images - where to find?

Edit: Cross posting with you. OK, that 'Action' menu item 'Move A to B address' - what comes up if you go into that?

Image
by Chandler
Thu Jan 30, 2020 10:34 pm
Forum: Hardware
Topic: Mega STE - no midi
Replies: 57
Views: 6196

Re: Mega STE - no midi

OK so some resistors in the midi circuit i have measured

R301, 302, 303, 304,305,306,307,308

Capacitors C301, 302

Diode D302

ALL ok
by Chandler
Thu Jan 30, 2020 10:29 pm
Forum: Hardware
Topic: Compo software dual tos 1.62 / 2.06 rom images - where to find?
Replies: 30
Views: 2935

Re: Compo software dual tos 1.62 / 2.06 rom images - where to find?

siriushardware wrote:Under 'Edit' or 'Action' do you have a 'Move' or 'Copy' facility?


Nope, no menu from edit when you click on it

Here is "Action" list

Image
by Chandler
Thu Jan 30, 2020 10:46 am
Forum: Hardware
Topic: Compo software dual tos 1.62 / 2.06 rom images - where to find?
Replies: 30
Views: 2935

Re: Compo software dual tos 1.62 / 2.06 rom images - where to find?

main page https://i.ibb.co/YQW88gy/willem-1.jpg Before i load TOS 2.06 https://i.ibb.co/k0cNXR8/willem-2.jpg Loaded TOS 2.06 (HI) https://i.ibb.co/mvXkSQ5/willem-3.jpg Now what? this is where i'm lost, if i just load TOS 1.62 (HI) after TOS 2.06 i'm guessing that's not correct I need to assign the i...
by Chandler
Wed Jan 29, 2020 11:38 pm
Forum: Hardware
Topic: Compo software dual tos 1.62 / 2.06 rom images - where to find?
Replies: 30
Views: 2935

Re: Compo software dual tos 1.62 / 2.06 rom images - where to find?

OK i'm just confused with this, i don't want to use the command prompt I have both TOS 1.62 and 2.06 on the Willem PCB50 programmer and can quite easily burn either TOS 1.62 or 2.or onto regular roms Can't i just burn TOS 1.62 and TOS 2.06 ODD onto the same 27C020 chip one after the other? and then ...
by Chandler
Mon Jan 27, 2020 11:08 pm
Forum: For sale / Wanted
Topic: [FREE] Atari SLM804 Laser Printer
Replies: 1
Views: 598

Re: [FREE] Atari SLM804 Laser Printer

I could be interested

have sent PM
by Chandler
Sun Jan 26, 2020 12:45 pm
Forum: For sale / Wanted
Topic: wanted: Mega STE / TT serial port plate 2 x metal fixing blocks
Replies: 7
Views: 2624

Re: wanted: Mega STE / TT serial port plate 2 x metal fixing blocks

i am still looking for just 1 of these blocks now, don't need the screws

Just the block

Anyone?

Swaps or paypal
by Chandler
Sun Jan 26, 2020 12:39 pm
Forum: Hardware
Topic: Compo software dual tos 1.62 / 2.06 rom images - where to find?
Replies: 30
Views: 2935

Re: Compo software dual tos 1.62 / 2.06 rom images - where to find?

Windows yes

Can you explain what you mean by this?

copy /b tos206.hgh+tos162.hgh merged.hgh
copy /b tos206.low+tos162.low merged.low

Go to advanced search