V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Help & information about the V2.X series boosters.
PhilC
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by PhilC » Sun Jan 13, 2019 1:29 pm

Isn't the black screen thing memory related?

So even if you have to switch to 8mhz more frequently, there us still going to be a large increase in speed. Might be worth trying it the STe way and then see if you can improve on things after you've got the basics working?
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Sun Jan 13, 2019 2:10 pm

The STE booster is pretty much the same design as this SEC booster. Only the sec needs a bit more work. The STE booster switches to 8mhz during DMA stuff. But its also a more forgiving design so its easier to get running than the STFM. Also the STE booster uses the STEs ROM decoding so its basically "bypassing" some issues that the stfm has as of course it doesnt decode tos 206 space.

I think the odd screen issues is something going out of sync in terms of ram and the shifter. I'm just saying its data corruption in the bus and its the same reason ROM isn't working because of corruption on the bus.

There is "Slots" between the ram access to cpu and shifter. Dtack to the CPU is held high and the data bus is isolated so the CPU waits its turn for ram access. So I think this "switching" is going out of sync causing the issues. By the looks of it it might be using dtack as reference points to the sync itself. So when that signal is missing things start going out of sync and chaos happens. Its just my best guess as its not relating to bus masters thats for sure.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by PhilC » Sun Jan 13, 2019 2:14 pm

I know people always suggest it but would it be easier to start with using a clock which is a multiple of 8, so the slots as you put it are predictable between each original clock cycle?

p.s reading this thread has been very useful from a learning point of view.
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Sun Jan 13, 2019 3:14 pm

Forgottenmyname wrote:
Sun Jan 13, 2019 2:14 pm
I know people always suggest it but would it be easier to start with using a clock which is a multiple of 8, so the slots as you put it are predictable between each original clock cycle?
Yes its easier, but on the STFM 32MHz clock isn't strong enough to use like it is on the STE. But also multiples of 8 dont seem to work. Has to be 8,16,32 for some reason. So the next step would be 64 which is to fast. Its why I need to use a dedicated osc 50mhz. The syncing of 50mhz isn't much of a problem, though the other chips are still running at 8mhz so it can cause timing issues.

Though like I said before, it can run GB6 all day without crashing. Though that is because I factored in all the needed timings for the slower 8mhz chips. But there is something else going on which I dont know about yet, so I cant factor that into the logic.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by PhilC » Sun Jan 13, 2019 3:16 pm

Well good luck, enjoy lots off time with your LA and scope then i guess?
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Fri Jan 18, 2019 9:26 pm

Forgottenmyname wrote:
Sun Jan 13, 2019 3:16 pm
Well good luck, enjoy lots off time with your LA and scope then i guess?
I don't exactly even have a LA... I do have USB one, but I already seem to spend more time fighting iffy software than doing anything. I have put in a request to TF for him to scope out stock timings exactly so I can see what they really are.. Most work I end up doing on my 2 channel scope :roll: I keep toying with getting a 4 channel one, but can't really justify the expense for what it would get used for.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Fri Jan 18, 2019 9:28 pm

New PCB's arrived a few days ago. But due to intense man-flu, won't be any progress until next week.

Once I get this going, I can investigate these odd issues I have been seeing...


sec2.jpg
sec2.jpg (146.77 KiB) Viewed 323 times
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by PhilC » Fri Jan 18, 2019 9:41 pm

Looking good

But

Is it me? Or is there some kindofspider like faceless monster on the bottom one?

How many did you get made?
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by exxos » Fri Jan 18, 2019 9:45 pm

Forgottenmyname wrote:
Fri Jan 18, 2019 9:41 pm
Is it me? Or is there some kindofspider like faceless monster on the bottom one?
Yeah, It all got hacked about that much it ended in a bit of a mess. TerribleFire will probably be having palpitations about it....
Forgottenmyname wrote:
Fri Jan 18, 2019 9:41 pm
How many did you get made?
Only 10. I can donate a board if anyone wants to build one up, but will need a Atmel programmer. I have no idea how long it will take to debug the odd faults though.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

PhilC
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

Post by PhilC » Fri Jan 18, 2019 9:55 pm

I would say yes but no atmel programmer yet and not sure how much help I would be in this case any way?
If it ain't broke, test it to Destruction.

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