exxos blog - random goings on

Blogs & guides and tales of woo by forum members.
User avatar
Icky
Moderator
Moderator
Posts: 1564
Joined: Sun Sep 03, 2017 10:57 am
Location: UK

Re: exxos blog - random goings on

Post by Icky » Fri May 03, 2019 10:52 pm

:cheer: :cheer: :cheer: :cheer: :cheer: :cheer: :cheer: :cheer: :cheer:

User avatar
Icky
Moderator
Moderator
Posts: 1564
Joined: Sun Sep 03, 2017 10:57 am
Location: UK

Re: exxos blog - random goings on

Post by Icky » Fri May 03, 2019 11:54 pm

PhilC wrote:
Fri May 03, 2019 10:36 pm
Does make you wonder why nobody at Atari did this back in the day.
I think back in the day the components weren't as stable / fast as we have today. They were probably pushing the limits of things back then and any additional speed would have made the systems unstable.

I am sure Atari were aware of what was possible. As any R&D team would do they would of pushed it to the limit but in the end a production stable system would need to be turned down.

User avatar
exxos
Site Admin
Site Admin
Posts: 8564
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: exxos blog - random goings on

Post by exxos » Sat May 04, 2019 12:03 am

RAM is always expensive as well...

on loop 27 now :)
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.

User avatar
exxos
Site Admin
Site Admin
Posts: 8564
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: exxos blog - random goings on

Post by exxos » Sat May 04, 2019 12:09 am

I don't think we are even maxing out the MMU...

Its not even slightly warm and its been pushing 32MHz for the past hour or so now...

Wonder if this would clock at 64MHz :lol: :twisted: :twisted:

5.jpg
5.jpg (121.3 KiB) Viewed 877 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.

User avatar
PhilC
Moderator
Moderator
Posts: 2046
Joined: Fri Mar 23, 2018 8:22 pm

Re: exxos blog - random goings on

Post by PhilC » Sat May 04, 2019 9:51 am

exxos wrote:
Sat May 04, 2019 12:09 am

Wonder if this would clock at 64MHz :lol: :twisted: :twisted:
Willing to bet we shall be finding out shortly :D
If it ain't broke, test it to Destruction.

User avatar
exxos
Site Admin
Site Admin
Posts: 8564
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: exxos blog - random goings on

Post by exxos » Sun May 05, 2019 12:28 pm

PhilC wrote:
Sat May 04, 2019 9:51 am
exxos wrote:
Sat May 04, 2019 12:09 am

Wonder if this would clock at 64MHz :lol: :twisted: :twisted:
Willing to bet we shall be finding out shortly :D
When I get the proper mod pcbs done, I will try it, but while the MMU may clock that speed, the GLUE is likely going to be the spanner in the works.

Ultimately, It would be good to have a FPGA core which includes MMU,GLUE,BLITTER. Though these cores are not 100% accurate, so even 8MHz modes are going to break stuff.

Probably the way to go is a future board to have the normal ST chipset, with a huge expansion header to replace those with the FPGA cores. Then the user can decide if they want max speed or max compatibility. This is assuming the suska cores. Ijor has another set of cores, but AFAIK they haven't been tested a great deal or are open source.. Similar with the suska cores, in that I don't think they have had much testing by anyone on a original setup. I know the suska core doesn't "support" wake up states, as Troed and I found out, his demos won't run on the suska cores.

Also FPGA cores mean people can add features or updates to them. I talked to Wolfgang last year about a tweak to the MMU core.. to basically allow a "fast block clear" direct to RAM. In that the CPU only sets start,end address, and block fill pattern. The MMU can clear a block of ram without involving the CPU or blitter for the actual data clearing. Tweaks to games or the OS could be done to use such a feature. As games use a lot of clearing , it should increase frame rates even on a stock 8MHz setup... Really just thinking out loud, but I think tweaking the cores to allow new features is a interesting idea...
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.

User avatar
exxos
Site Admin
Site Admin
Posts: 8564
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: exxos blog - random goings on

Post by exxos » Sun May 05, 2019 10:25 pm

First mock-up of the Alpha 16MHz mod board...

1.jpg
1.jpg (269.27 KiB) Viewed 815 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.

User avatar
exxos
Site Admin
Site Admin
Posts: 8564
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: exxos blog - random goings on

Post by exxos » Sun May 05, 2019 10:44 pm

Pretty much this really I think...

2.jpg
2.jpg (198.89 KiB) Viewed 809 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.

User avatar
exxos
Site Admin
Site Admin
Posts: 8564
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: exxos blog - random goings on

Post by exxos » Mon May 06, 2019 1:41 pm

2600 RGB kit come :)

Now to find some time to build it all up.....

IMG_4135.JPG
IMG_4135.JPG (98.53 KiB) Viewed 792 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.

User avatar
exxos
Site Admin
Site Admin
Posts: 8564
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: exxos blog - random goings on

Post by exxos » Mon May 06, 2019 8:37 pm

I have transplanted my board into a more secure location..

Oddly it started being unstable again.. But placing a 50pF capacitor on the 32Mhz input to the mod board seems to have solved it.. I think the oscillator I am using is not very good... It seems to have something like a 0.9V DC offset for some reason. So I am going to remove this and use the proper 32MHz oscillators I got and see what the output is like on those.

IMG_4136.JPG
IMG_4136.JPG (374.22 KiB) Viewed 773 times

EDIT:

Some screw screwups :)

IMG_4137.JPG
IMG_4137.JPG (104.51 KiB) Viewed 770 times
IMG_4139.JPG
IMG_4139.JPG (97.14 KiB) Viewed 770 times
Now I had to remove the 50pF cap to get the video to work right. Voltages on the osc are now good, about 0v - 3V.
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.

Post Reply

Return to “MEMBER BLOGS”