V2.5 BOOSTER CURRENT PROTOTYPE STATUS

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

Post by Atarian Computing » Fri Jun 01, 2018 8:48 pm

:dizzy: I feel weak. This is great.

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exxos
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by exxos » Fri Jun 01, 2018 9:53 pm

Just for comparisons with 16MHz CPU... This is 50MHz CPU only...


16MHz CPU

16CPU_result.png
16CPU_result.png (4.4 KiB) Viewed 547 times

50MHz CPU
50MHZCPU_result.png
50MHZCPU_result.png (4.38 KiB) Viewed 547 times

So we can see running the CPU faster clearly has a point of diminishing returns somewhere..

For example at 16MHz the first test is 123%, but at 50MHz is only 137%.. So a measly increase of 14% despite huge MHz increase. Though this really is to be expected 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

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by exxos » Sat Jun 02, 2018 9:56 am

Been thinking about the next step.. ROM.. Though I think its time to investigate flash-rom and get that working along with fast-ram.

The flash I am looking at using is SST39LF802C-55 , still 55ns, but as I suggested before, copying to fast-ram is only way to go faster..

If anyone can find something like 10ns sram 16 bit 5V or 3.3V (higher Mb the better as limited on space) then let me know..
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 » Sun Jun 03, 2018 10:16 pm

In terms of ROM there are devices like the ST39LF801 which is 8Mbit x 16, would be ideal, but it is 3.3V :roll: so I would need level translators to use this..

There is also 5V flash SST39SF040 but 4Mbit x 8bit, so will need 2 of these.. Which I think will be easier and take less board space than adding in level translators.. But of course only enough space for 2 flash banks, not 4. But the least initially the 5V ones will be plenty get things working and tested.

Looking at SRAM, there are 5V and 3.3V of thing likes this
IS61WV5128BLL-10TLI
IS61C5128AL-10TLI

https://www.mouser.co.uk/ProductDetail/ ... A0dXGpI%3d

So either way is possible, but initially to avoid using level translators, 5V makes easy work for a prototype. Again would need two of these chips for 4Mbit. So only going to give 1MB of fast-ram, but again, this is a prototype testing so does not really matter on size. Of course this will be large enough to try ROM to SRAM copy as I was discussing earlier..

I will try and start designing new PCB for this soon....
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

Post by IngoQ » Mon Jun 04, 2018 1:33 pm

exxos wrote:
Fri Jun 01, 2018 7:47 pm
58MHz!!! :twisted: :twisted: :twisted:
int-div from 566%(55mhz) to just shy of 600%!
Holy crap.... :shock: You really did it :excited: :yay2: :cheer:
Ingo :geek:

“Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.” - Antoine de Saint-Exupéry

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exxos
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by exxos » Mon Jun 04, 2018 4:41 pm

IngoQ wrote:
Mon Jun 04, 2018 1:33 pm
Holy crap.... :shock: You really did it :excited: :yay2: :cheer:
8-) 8-) 8-)
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

Post by exxos » Mon Jun 04, 2018 4:44 pm

Started the schematic and rough pcb layout...

There has to be a "cut out" on the top left of the booster board (like the V2.2 booster) to avoid "hitting" the MMU.. The Flash and Fast-Ram take up a lot of space.. so god knows how more fast-ram is going to physically fit on later boards. :shrug:

sec2.png
sec2.png (83.16 KiB) Viewed 461 times
sec2.jpg
sec2.jpg (125.23 KiB) Viewed 461 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.

Forgottenmyname
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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by Forgottenmyname » Wed Jun 06, 2018 9:39 am

Looks good, can you piggy back a ram expansion board on perhaps?

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by troed » Wed Jun 06, 2018 9:45 am

IMHO it's more attractive on the STFM to overclock the MMU. While not as fast as running it directly off the CPU, it's proper ST RAM and it's an "easy" 200% boost.

FAST ROM, sure.

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Re: V2.5 BOOSTER CURRENT PROTOTYPE STATUS

Post by exxos » Wed Jun 06, 2018 10:07 am

Forgottenmyname wrote:
Wed Jun 06, 2018 9:39 am
Looks good, can you piggy back a ram expansion board on perhaps?
Possible it might have to be done like that.

troed wrote:
Wed Jun 06, 2018 9:45 am
IMHO it's more attractive on the STFM to overclock the MMU. While not as fast as running it directly off the CPU, it's proper ST RAM and it's an "easy" 200% boost.

FAST ROM, sure.
But its not easy because its not stable ;) and with all the mods like new RAM etc, most people won't be able to do it. I even got loads of SMT MMU's to do just that, but as you know, I want to move to FPGA MMU and clock it at the same speed as the CPU and include SRAM on board. Though as this will take the next year to do.. it will have to wait.

Meanwhile, the V2.2 booster has been out of stock for some time, so I really need to wrap up this booster as its successor. Fast-Ram will run over 6x faster along with ROM and the 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

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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