V2.5 BOOSTER CURRENT PROTOTYPE STATUS (SEC BOOSTER)

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

Post by exxos » Thu Jun 20, 2019 2:25 pm

It has been going about two hours now...

IMG_4405.JPG
IMG_4405.JPG (20.56 KiB) Viewed 624 times

So it is not like the ROM is un-stable either..

I will put GB6 back on see what happens...

EDIT:

Typical as it crashed on the first test :lol: :pullhair:

But the thing is, I actually change the ROM IC as I had a patched 104 which wouldn't checksum correctly in the diagnostic cartridge.. So I just put the original one back in, and the tests are running again... So next step is to introduce another wait state onto the ROM access to slow it down a fraction to see if that helps..
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 Jun 20, 2019 2:51 pm

ROM 2WS
2ws.JPG
2ws.JPG (106 KiB) Viewed 619 times



ROM 3WS
3ws.JPG
3ws.JPG (103.14 KiB) Viewed 619 times
So the ROM I had issues with just, is working fine with 3WS.

So I will put back the ROM I had before, and leave it running and see what happens...
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 Jun 20, 2019 5:38 pm

62 passes so far :)

I did some quick calculations...

50mhz 20ns x 2 = 40ns (crashes)
40Mhz 25ns x 2 = 50ns (crashes)
50mhz 20ns x 3 = 60ns (OK so far)

does anyone find it coincidental that the ROM access time is 55ns....
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 Icky » Thu Jun 20, 2019 9:42 pm

exxos wrote:
Thu Jun 20, 2019 5:38 pm
62 passes so far :)

I did some quick calculations...

50mhz 20ns x 2 = 40ns (crashes)
40Mhz 25ns x 2 = 50ns (crashes)
50mhz 20ns x 3 = 60ns (OK so far)

does anyone find it coincidental that the ROM access time is 55ns....
:)

So what is the fastest access time for ROM that will work with the ST?

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

Post by exxos » Thu Jun 20, 2019 9:47 pm

Icky wrote:
Thu Jun 20, 2019 9:42 pm
So what is the fastest access time for ROM that will work with the ST?

The problem is, there is no ROM faster than 55ns... The CPU can 40ns at 50MHz... but they don't exist :( At least not in OTP 5V stuff.. maybe 3.3V or flash, but not looked in a long time. But a bit irrelevant as I have to use 5V OTP currently anyway.
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 Icky » Thu Jun 20, 2019 9:52 pm

exxos wrote:
Thu Jun 20, 2019 9:47 pm
Icky wrote:
Thu Jun 20, 2019 9:42 pm
So what is the fastest access time for ROM that will work with the ST?

The problem is, there is no ROM faster than 55ns... The CPU can 40ns at 50MHz... but they don't exist :( At least not in OTP 5V stuff.. maybe 3.3V or flash, but not looked in a long time. But a bit irrelevant as I have to use 5V OTP currently anyway.
:( - Another ceiling reached.

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

Post by exxos » Thu Jun 20, 2019 9:54 pm

Icky wrote:
Thu Jun 20, 2019 9:52 pm
:( - Another ceiling reached.
Yep. I cannot remember what the speed of the flash chips were which we plotting with even now...

I have also plotted copying the ROM over to a small block of 10ns RAM on power up a while ago..But again its another project.. :(
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 Icky » Thu Jun 20, 2019 10:09 pm

exxos wrote:
Thu Jun 20, 2019 9:54 pm
Icky wrote:
Thu Jun 20, 2019 9:52 pm
:( - Another ceiling reached.
Yep. I cannot remember what the speed of the flash chips were which we plotting with even now...

I have also plotted copying the ROM over to a small block of 10ns RAM on power up a while ago..But again its another project.. :(
I think the flash chips we were looking at for the Flash Clock Dev board could go to down to 45ns

CORRECTION: the 3V versions of the chips go down to 45ns the 5V versions 55ns.

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

Post by exxos » Thu Jun 20, 2019 10:26 pm

Icky wrote:
Thu Jun 20, 2019 10:09 pm
I think the flash chips we were looking at for the Flash Clock Dev board could go to down to 45ns

CORRECTION: the 3V versions of the chips go down to 45ns the 5V versions 55ns.
40ns would equal 50MHz CPU.. I mean if we pushed higher speeds such as 55MHz, then 36ns.. of course PLD delays add a bit to it as well, so would really need 30ns maximum to make it work.. only really possible with some SRAM and copy ROM to it on boot.
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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