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soviet9922 wrote:This mean that technically this board can be fabricated now ?
mikro wrote:Wow, where did you find it?
mikro wrote:Thanks, I thought all the PCBs are already explored, great find then.
Maeke wrote:btw sure would be great if the schematics and the gals/pals files were recovered, this would allow us to reproduce the ide system atari was planning to use on the st line, the existing designs have a flow since they don't work if the cpu is boosted (from what i saw on ebay, the ide card for the mega-ste doesn't work at 16 Mhz, and we had proofs that the ppera design doesn't work with exxos's 32Mhz booster).
Maeke wrote:btw sure would be great if the schematics and the gals/pals files were recovered, this would allow us to reproduce the ide system atari was planning to use on the st line, the existing designs have a flow since they don't work if the cpu is boosted
czietz wrote:Maeke wrote:btw sure would be great if the schematics and the gals/pals files were recovered, this would allow us to reproduce the ide system atari was planning to use on the st line, the existing designs have a flow since they don't work if the cpu is boosted
As the 1040STe+ would have run with 8 MHz only, I don't think Atari designed the IDE interface for different clock speeds, though. Possibly it's just the IDE interface of the ST Book condensed in a single GAL/PAL.
exxos wrote:Maeke wrote:btw sure would be great if the schematics and the gals/pals files were recovered, this would allow us to reproduce the ide system atari was planning to use on the st line, the existing designs have a flow since they don't work if the cpu is boosted (from what i saw on ebay, the ide card for the mega-ste doesn't work at 16 Mhz, and we had proofs that the ppera design doesn't work with exxos's 32Mhz booster).
Problem with most of the IDE designs they use the 8Mhz clock for timings. The IDE bus cycle while its total cycle length matches the IDE timing cycle, you can't use the 8Mhz clock reliably to time stuff. This is why I gave up with trying to use the 8Mhz clock. Technically the IDE interface should still work with 32MHz as the booster switches to 8MHz during a ST bus cycle, but it doesn't. I did buy a second hand monster for the STE to diagnose the issue, but again, I just don't have time to try things out.
I guess if the IDE interfaces work reliable at 8MHz then if the clock pin is cut and feed back with the 8Mhz clock then it may work. Or the only other possible thing could be that the booster sets /AS slightly faster than expected, so Monster might not like that. running /
AS though a clocked FF's to re-sync /AS might cure it. Though I have no idea how Alan is timing monster. Even so, I just gave up with that method. I never got ppera's design to work either.
In anycase, the IDE design I have done (likely won't get tested for a long time yet as just to busy with other things) uses timers to match the published IDE timing specification. The timings match IDE specs exactly, also it doesn't use the system clock (8MHz or 32MHz at all) so the design would be future proof for all boosters.
Maeke wrote:Well since i don't have a st book and never had one, i don't know about it's ide interface.
1st1 wrote:Maeke wrote:Well since i don't have a st book and never had one, i don't know about it's ide interface.
You can study it in ST-Book circuit diagram. http://dev-docs.atariforge.org/files/ST ... 8-1992.pdf
Maeke wrote:btw sure would be great if the schematics and the gals/pals files were recovered, this would allow us to reproduce the ide system atari was planning to use on the st line, the existing designs have a flow since they don't work if the cpu is boosted (from what i saw on ebay, the ide card for the mega-ste doesn't work at 16 Mhz, and we had proofs that the ppera design doesn't work with exxos's 32Mhz booster).
alanh wrote:Maeke wrote:btw sure would be great if the schematics and the gals/pals files were recovered, this would allow us to reproduce the ide system atari was planning to use on the st line, the existing designs have a flow since they don't work if the cpu is boosted (from what i saw on ebay, the ide card for the mega-ste doesn't work at 16 Mhz, and we had proofs that the ppera design doesn't work with exxos's 32Mhz booster).
The MonSTer with it's IDE works fine at 8MHz and 16MHz on the MegaSTE.
Maeke wrote:btw sure would be great if the schematics and the gals/pals files were recovered, this would allow us to reproduce the ide system atari was planning to use on the st line, the existing designs have a flow since they don't work if the cpu is boosted (from what i saw on ebay, the ide card for the mega-ste doesn't work at 16 Mhz, and we had proofs that the ppera design doesn't work with exxos's 32Mhz booster).
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