Maybe the buggy DMA tester is buggy
DMA ISSUE ON H4
Re: DMA ISSUE ON H4
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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.
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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.
Re: DMA ISSUE ON H4
I doubt it since I've run it on 5 other machines which all pass. What ever it is is minor but it is nice to have something that makes a definitive call. What sucks is there software. Really doesn't tell you what is in error. Very terse error code then tells you to change all the chips. If the second H4 fails I will se if I can determine what it is unhappy with. Would be a nice project to disassemble the test cart code, add some actual definition to failures and transplant some of the tests to diagrom.
Re: DMA ISSUE ON H4
@PaulJ Do you have a close up image of the test board showing the chips used on the thing ? Also is it a original kit or a repo ? What DMA chip is being used ?
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: DMA ISSUE ON H4
@exxos ,see pic.. It also has circuitry to test parallel interface, and joystick interfaces.
Re: DMA ISSUE ON H4
Thanks. Have you put the diag-cart in a DMA loop test and scoped out all the lines on the DMA port ? A1 has caused no end of trouble on STFM's.
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: DMA ISSUE ON H4
@exxos , No since the ultra satan was working I didn't devote much time since I wanted to get the H2 #2 working. Plan on getting back to it though since it passes with all the other atari's.
Re: DMA ISSUE ON H4
@exxos , just ran all the diagcart tests on H4-2 and everything passes except the parallel port. The DMA test passes on this board and I also put in the glitter out of the remake which passes. So I guess there may be some issue with the DMA on the H4-1.
Re: DMA ISSUE ON H4
For completeness, this fix is tested and works for me.
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
- rubber_jonnie
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Re: DMA ISSUE ON H4
@exxos Ok, just to ensure I'm understanding the patch board correctly, it fits in the socket for the 74LS245 and inverts the FDCS signal going to pin 19 of the 245? I presume the FDCS signal is taken from the DMA chip directly since the patch board does not allow the original FDCS signal to route from the DMA chip?
I just want to understand before I go and build one of these things.
Ta.
I just want to understand before I go and build one of these things.
Ta.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Re: DMA ISSUE ON H4
Thats correct @rubber_jonnie you can tap FDCS line from pin 19 of the other 74LS245 IC5 above it.rubber_jonnie wrote: ↑Wed Mar 11, 2020 11:25 pm @exxos Ok, just to ensure I'm understanding the patch board correctly, it fits in the socket for the 74LS245 and inverts the FDCS signal going to pin 19 of the 245? I presume the FDCS signal is taken from the DMA chip directly since the patch board does not allow the original FDCS signal to route from the DMA chip?
I just want to understand before I go and build one of these things.
Ta.