V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

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

Post by ijor » Wed Feb 06, 2019 10:52 am

exxos wrote:
Wed Feb 06, 2019 2:33 am
ijor wrote:
Wed Feb 06, 2019 1:36 am
.So are you going to implement shadow ram for copying the rom to ram?
No point is there.
I thought you said flash rom is not fast enough for 50 MHZ without wait states?
http://github.com/ijor/fx68k 68000 cycle exact FPGA core
FX CAST Cycle Accurate Atari ST core
http://pasti.fxatari.com

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

Post by exxos » Wed Feb 06, 2019 1:26 pm

ijor wrote:
Wed Feb 06, 2019 10:52 am
I thought you said flash rom is not fast enough for 50 MHZ without wait states?
listed the spec here.

viewtopic.php?f=6&t=45&start=390#p17713

flash is 45ns, sram is 45ns.
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 exxos » Wed Mar 20, 2019 9:44 pm

This project is basically on hold when I figure out some stuff..

I needed a flexible register to store settings.. I was thinking of using a ATtiny where Urban said he could do the firmware this.. Basically using the tiny as some simple flash storage.. But I've been thinking over the past few days that really I should be moving over to the RTC chip as it has built-in NVRAM where I can store some settings and of course it gives a clock as well.

I may have mentioned the technicals of such a thing before. Basically things like TOS 104 / 206 select would be software switchable stored in a simple flash register so that once it is set, it will stay like that without having to load software to program or set things each time.

So rather than spending time on the tiny chip, I have been talking to Icky about doing a small development board to work on the flash and RTC stuff. It would make more sense to figure this stuff out and programmed the software for it before going any further with the SEC booster...

So this project has now branched to the topic below.

viewtopic.php?f=73&t=1697
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 exxos » Sun Mar 31, 2019 2:25 pm

The "full" version of the SEC booster with flash and RTC & fast-ram I am just not going to go ahead with this project anytime soon. As said above, there is much work to be done with the RTC & Flash firmware yet which are own projects in their own right which will take a lot of time.

As the "simple" SEC is basically completed. When/If I get chance I will produce a few of those boards as the SEC design will move over to the remake project ultimately, so it needs more testing before that happens anyway.

Overall I am trying to reduce the workload on projects to concentrate on the remake boards.
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 exxos » Mon Apr 08, 2019 9:58 pm

As my SEC machine was hijacked for testing the V2.3 booster, I just put it all back together and the blitter was seriously freaking out! It would basically crash getting to desktop and then totally corrupt the screen with garbage.

Turns out, when I added in the 390pF capacitor back onto A1, I sold it directly onto the ROM board. Originally I had a yellow wire connecting the capacitor to the outer GND part of the motherboard is shown in the image below..

So I put the wire back in, and the blitter is now behaving! Totally bonkers!

I think there's a little more investigating to do circulating around A1 in relating to the DMA & BLITTER!

On the next revision board I have rooted A1 via the PLD in case that would help with something at some point.

IMG_3956.JPG
IMG_3956.JPG (136.31 KiB) Viewed 889 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

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

Post by exxos » Mon Apr 08, 2019 10:29 pm

Scope came out..

Left to right..

A1 as stock.... A1 with 390pF added... A1 with wire and 390pF added... Only the last image works...

1.png
1.png (16.83 KiB) Viewed 883 times

I'm going to try adding a few ohms to see what happens... I suspect there needs to be a delay on A1 for some reason :shrug:

EDIT:
68R in series didn't work at all again...
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 exxos » Tue Apr 09, 2019 11:54 am

I measured A1 on the DMA pin directly and saw total chaos..But this actually works oddly.

p2c.png
p2c.png (7.7 KiB) Viewed 866 times

Without the capacitor there is reasonable nice square wave..

So I cut the A1 line at the DMA and added about 100R series with it. This did not allow the machine to boot (which is what happens without the capacitor).

Then I added 50pF onto it and now the machine boots perfectly and the waveform looks pretty nice as well.

Oddly with just the 50pF on its own, machine does not reset, but about 30 seconds later it does and then works perfectly.. Bizarre..

I don't think this is a bad signal on A1, but it just must need a tiny delay there some reason.

I did try keeping BGACK low for one extra cycle in case the CPU was starting the next cycle too fast after a DMA cycle (or blitters) but this did not make any difference.
IMG_3957.JPG
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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 exxos » Tue Apr 09, 2019 1:46 pm

abcd.png
abcd.png (8.9 KiB) Viewed 858 times
This scope shows A1 before and after the resistor.

The yellow signal is after..

I was seeing some undershoot and overshoot earlier this was smoothed out by the resistor and capacitor.. So it is cleaning up the signal. I have zoomed in and checked a lot between the two, and I do not really see any delays there. As you can see in the image above, signals still look pretty much identical. But without the resistor and capacitor, machine does not boot up at all.. So it's a bit of a mystery still..
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 exxos » Thu May 02, 2019 2:13 pm

SEC_F3.jpg
SEC_F3.jpg (73.27 KiB) Viewed 714 times

So thanks to a generous person of sending me these boards... I will bag a few of these up to send off for assembly... This board of course has the sound fix as mentioned previously, and also I have A1 routed via the PLD to experiment with that issue a little more...These are running at 50MHz..

Benchmarks viewtopic.php?f=42&t=1834

Small number of these boards when madeup and tested will be available in my store as beta test versions..
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 May 03, 2019 10:57 am

I only had 3 ATF1508 chips here, so ordered seven more (at £10+ a pop they not cheap!) , they should be here today. I have packed up enough parts to send off for 10 to be made, likely seven will make it to my store.. Bank holiday weekend will delay things as will be able to post them off until next week now :(


This is the video of it in action in case anyone missed it

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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