PCB Build - Progress - Post your Pics here :-)

All information relating to the Alpha plus all the WIP threads etc.
User avatar
exxos
Site Admin
Site Admin
Posts: 24239
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: PCB Build - Progress - Post your Pics here :-)

Post by exxos »

So I obviously got confused with those 3 Hsync lines :(

The fix is simple to do.. Lift pin 8 out of the socket on the LS04 U51 (or cut it off) .. and wire link on the bottom of the socket pins 8 & 9... so that will bypass that inverter...
d1.JPG
d1.JPG (49.49 KiB) Viewed 4779 times
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
PaulJ
Posts: 1568
Joined: Sun Apr 08, 2018 1:14 am
Location: USA

Re: PCB Build - Progress - Post your Pics here :-)

Post by PaulJ »

Its going to a while before I get all the parts together to build my board.. still waiting for the board to make the trip across the pond and parts I have ordered. So if processor signals look good I think I would plug in the diagnostic cartridge and a 9600 baud terminal (terminal emulator) to the serial port. There's a better chance to get a meaningful interaction out of the serial port. Do not need board video or keyboard to have an a interaction. Big issue would be if a good serial setup was present in the 6850. Just a thought.. :D
User avatar
exxos
Site Admin
Site Admin
Posts: 24239
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: PCB Build - Progress - Post your Pics here :-)

Post by exxos »

But the serial port has had a total re-design, it hasn't been tested either :)
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
rpineau
Posts: 534
Joined: Thu Aug 17, 2017 6:08 pm
Location: USA
Contact:

Re: PCB Build - Progress - Post your Pics here :-)

Post by rpineau »

And the serial port on the ST is done by the MFP, not the ACIA (they are use for MIDI and Keyboard).
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2
User avatar
exxos
Site Admin
Site Admin
Posts: 24239
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: PCB Build - Progress - Post your Pics here :-)

Post by exxos »

I've boxed up my board and bits to send off tomorrow for assembly.. Don't really know how long that will take, maybe a couple of weeks I guess..

I guess we really need to see if someone else as this video sync fault or not.. I mean really even a broken system should still output stable video frame..
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
PhilC
Moderator
Moderator
Posts: 6069
Joined: Fri Mar 23, 2018 8:22 pm

Re: PCB Build - Progress - Post your Pics here :-)

Post by PhilC »

Will do the video mod soon, I did notice that there were two inverted signals on the monitor port but then we had a power cut, so didnt get a chance to note which ones.

I did see 15Khz and 60Khz out of the Glue.

Hopefully have more time later on or tomorrow.
If it ain't broke, test it to Destruction.
User avatar
exxos
Site Admin
Site Admin
Posts: 24239
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: PCB Build - Progress - Post your Pics here :-)

Post by exxos »

Forgottenmyname wrote: Mon Sep 17, 2018 6:55 pm Will do the video mod soon, I did notice that there were two inverted signals on the monitor port but then we had a power cut, so didnt get a chance to note which ones.

I did see 15Khz and 60Khz out of the Glue.
The inverters are not actually used (well shouldn't be) there were for the modulator... just I didn't notice there was 3 HSYNC signals going on.. but the monitor port goes syncs go direct to the GLUE without buffering... so I might actually add buffers on those on a later revision (if it doesn't break something that is).

All other signals come from the shifter directly.. so monitor output should be good.. at least it has a black screen and white border, so looks like the RGB buffers I re-designed are working.. so that is at least something...
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
troed
Moderator
Moderator
Posts: 913
Joined: Mon Aug 21, 2017 10:27 pm

Re: PCB Build - Progress - Post your Pics here :-)

Post by troed »

Forgottenmyname wrote: Mon Sep 17, 2018 6:55 pm I did see 15Khz and 60Khz out of the Glue.
Assuming you have a PAL TOS, that means TOS didn't execute and/or the machine is being kept in RESET. One of the first things it does is to set 50Hz.

It does mean GLUE is working as it should :D
User avatar
exxos
Site Admin
Site Admin
Posts: 24239
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: PCB Build - Progress - Post your Pics here :-)

Post by exxos »

troed wrote: Mon Sep 17, 2018 7:28 pm
Forgottenmyname wrote: Mon Sep 17, 2018 6:55 pm I did see 15Khz and 60Khz out of the Glue.
Assuming you have a PAL TOS, that means TOS didn't execute and/or the machine is being kept in RESET. One of the first things it does is to set 50Hz.

It does mean GLUE is working as it should :D
That is a good point actually... I sent out PAL versions of the ROM.. Peoples monitors really need to support 50 & 60Hz.. mine does :P

I'm checking around the video and don't see any other mistakes anywhere..
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
PhilC
Moderator
Moderator
Posts: 6069
Joined: Fri Mar 23, 2018 8:22 pm

Re: PCB Build - Progress - Post your Pics here :-)

Post by PhilC »

See, I learn something new every time I turn this board on, which is one of the reasons I got it 8-)
If it ain't broke, test it to Destruction.
Post Reply

Return to “ALPHA DEVELOPMENT INFO”