V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Help & information about the V2.5 booster.
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rubber_jonnie
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by rubber_jonnie » Wed May 30, 2018 10:02 am

Fantastic job!

:bravo: :cheers:
Collector of old Atari things:
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Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
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IngoQ
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by IngoQ » Wed May 30, 2018 11:13 am

Whoa.... :shock: Was there ever before a 68000 running at 50MHz in a computer?

Congrats! :yay: :cheer: :dualthumbup: :yay2:
Ingo :geek:

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exxos
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by exxos » Wed May 30, 2018 1:12 pm

IngoQ wrote:
Wed May 30, 2018 11:13 am
Whoa.... :shock: Was there ever before a 68000 running at 50MHz in a computer?
There are those "miming" things which use the SEC at 50MHz.. but AFAIK there has never been a 50MHz 68000 in Atari... IIRC the T28 could be fastest.. but think they did a T36 or something as well...

I have been thinking about the now "slow" ROM.. Thinking along the lines of copying the ROM to SRAM before the 68000 starts... So ROM will be held in SRAM at normal TOS104 space.. I think the CT60 does something like that.. but not sure if it changes address or not... But should be possible to do direct copy from ROM to SRAM very quick, then machine boots TOS from SRAM...
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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tuxie
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by tuxie » Wed May 30, 2018 2:32 pm

Congrats exxos :)

I know you should get 54Mhz OSC there is no 55Mhz.. i am pretty sure you can archive 54Mhz. Then you can let run the rom with the half of the clock speed.

Regards Ingo

P.S.: I still have 300pieces 68EC020 left ^^ maybe someone is interested to build a small cheap booster with it .

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exxos
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by exxos » Wed May 30, 2018 3:41 pm

tuxie wrote:
Wed May 30, 2018 2:32 pm
Congrats exxos :)
Thanks :)
tuxie wrote:
Wed May 30, 2018 2:32 pm
I know you should get 54Mhz OSC there is no 55Mhz.. i am pretty sure you can archive 54Mhz.
Yeah, I'm going to try to find out max possible speed..
tuxie wrote:
Wed May 30, 2018 2:32 pm
Then you can let run the rom with the half of the clock speed.
Yeah, I can do waitstates, but wanted to max out the speed for access. I was pushed to do 32MHz with 55ns ROM.. So 50MHz and over is just a no go with OTP ROMs.. only sram likely possible.
tuxie wrote:
Wed May 30, 2018 2:32 pm
P.S.: I still have 300pieces 68EC020 left ^^ maybe someone is interested to build a small cheap booster with it .
Yes, I have a plan for those ;) SEC wires up almost like a 020, so should almost be a straight swap for the SEC CPU :)
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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stephen_usher
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by stephen_usher » Wed May 30, 2018 6:30 pm

exxos wrote:
Wed May 30, 2018 9:43 am
Atarian Computing wrote:
Wed May 30, 2018 4:27 am
That's crazy. Well done! In terms of integer division, how would a 50mhz 68000 compare to TT's 32mhz 030?
Well 030 has a cache so will be faster for the same clock speed, plus 030 is more efficient core.. you would have to benchmark it with GB6 and see what it outputs with and without caches enabled.. Which would be useful anyway as we don't have a TT benchmark vs stock ST.. or Falcon in fact..
Well, here's the GEMBench output from a TT...
Image

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exxos
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by exxos » Wed May 30, 2018 9:17 pm

stephen_usher wrote:
Wed May 30, 2018 6:30 pm
Well, here's the GEMBench output from a TT...
cool! What do you get without caches ?
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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exxos
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by exxos » Wed May 30, 2018 10:12 pm

Only just got home.. but quickly tried 60MHz with my RSO.. it tries to boot, but not really get far enough to boot from floppy (it did half boot GB6 once).. I did some code changes and it not helped.

64MHz doesn't even try to boot as tried yesterday.. So likely max speed of CPU is around 55MHz... Likely why designs I see mostly use 50MHz.

I will see if there any options for OSC around 55MHz... will also try the speed tomorrow..
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.

stephen_usher
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by stephen_usher » Wed May 30, 2018 10:33 pm

OK, I did three more tests for sort of completeness...

ST Medium resolution, no caches
Image

TT Medium resolution, with cache
Image

TT Medium resolution, with cache, program in TT-RAM
Image

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exxos
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by exxos » Wed May 30, 2018 10:52 pm

stephen_usher wrote:
Wed May 30, 2018 10:33 pm
OK, I did three more tests for sort of completeness...
Thanks! just goes to show the 030 is like 50% faster at int-div! (i've posted the images in the benchmark section as well).
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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