Hi everyone
I tried using PARCP on my 2nd board and it fails to work which may mean either I have some dodgy soldering or the port pins are not correct.
Parallel port
Parallel port
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Re: Parallel port
Interesting. the data is only off by 1 bit : $4853 expected but it got $5853
So check the 6th bit (IOB5) on the parallel port between the 2149 and the connector.
Looks like the bit is stuck to 1 so may be a short with VCC.
Code: Select all
$4853 : 0100 1000 0101 0011
$5853 : 0101 1000 0101 0011
wrong bit -|
Looks like the bit is stuck to 1 so may be a short with VCC.
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2
Need testing : Falcon with CT2
Re: Parallel port
I have tested continuity with a multi-meter on the 2149 between pin 8 (IOB5) and pin 40 (VCC) on both of my boards and it looks like they are connected.
I cannot see any obvious soldering shorts.
I am guessing that they shouldn't be?
Reading the data sheet for the 2149, the IO bus pins have a pull-up resistance, so does this mean they are indeed connected to VCC?
I have also tested continuity to pin 7 on the parallel port and its connected to the 2149 pin 8.
I cannot see any obvious soldering shorts.
I am guessing that they shouldn't be?
Reading the data sheet for the 2149, the IO bus pins have a pull-up resistance, so does this mean they are indeed connected to VCC?
I have also tested continuity to pin 7 on the parallel port and its connected to the 2149 pin 8.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Re: Parallel port
There are some vias close to the parallel port pins.. so worth checking you haven't bridged over to any.. also possible the YM chip is faulty ?
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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.
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.
Re: Parallel port
I have swapped the 2149 chip and same results so not the chip.
All IOB pins on the 2149 chip are showing as connected to VCC when I do a continuity check with my multi-meter. Not sure how a soldering short would connect all IOB pins to VCC?
Also, not sure how I would have made this happen on 2 boards.
All IOB pins on the 2149 chip are showing as connected to VCC when I do a continuity check with my multi-meter. Not sure how a soldering short would connect all IOB pins to VCC?
Also, not sure how I would have made this happen on 2 boards.
Atari Falcon 030 | Atari 1040 STE | Atari 1040 STFM | Atari 1040 STF | Kryoflux & Supercard Pro Flux boards
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Creator of the Atari ST Review magazine archive: https://www.chillichai.com/atari-st-review
Re: Parallel port
I never checked that chip with the meter before,so I don't know if that is right or not anyway.I would suggest you check on a normal ST,and also suggest you use resistance setting on your meter rather than continuity test.
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.
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.
Re: Parallel port
I don't have anything real to connect to the parallel port but mine was questionable when I ran it with the diag kit. With just the test board connected it failed but when I hooked up the digital analyzer it started passing which I attributed to a real device having pull-ups. I also changed the 2149 and no difference. Maybe I'll give it another run today. The Diag test walked 1 across the eight bits reading back what it had written.
Re: Parallel port
Maybe try a 10k pull up on the io pins and see if that helps ?
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.
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.
Re: Parallel port
I'll take a look today and see if I can get to reliable operation with the cart.