ALPHA MODIFICATIONS

Super ST Project. Lets create a awesome new ST! Fix all the bugs and add more cool stuff!
PhilC
Trusted Guru
Trusted Guru
Posts: 1450
Joined: Fri Mar 23, 2018 8:22 pm

Re: ALPHA MODIFICATIONS

Post by PhilC » Wed Sep 26, 2018 11:23 am

exxos wrote:
Tue Sep 25, 2018 10:47 pm
Icky wrote:
Tue Sep 25, 2018 10:42 pm
I think you just like to keep me busy with my soldering iron
At least your keeping up, Not sure where the other 15 people have gotten to...
Me? I'd rather sensibly gone to bed :P
If it ain't broke, test it to Destruction.

User avatar
rubber_jonnie
Moderator
Moderator
Posts: 1237
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: ALPHA MODIFICATIONS

Post by rubber_jonnie » Wed Sep 26, 2018 12:43 pm

I'm waaaay behind, on account of other priorities, work, home maintenance etc.

I'm kind of at the stage now thinking I should wait in order to apply all the fixes in one go to see how it turns out!!

I've barely touched an Atari in weeks now :(

Still, winter is coming,which means I should have more Atari time!!
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
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..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

PhilC
Trusted Guru
Trusted Guru
Posts: 1450
Joined: Fri Mar 23, 2018 8:22 pm

Re: ALPHA MODIFICATIONS

Post by PhilC » Wed Sep 26, 2018 5:47 pm

I can verify that those fixes work on my board too.

And as with Icky's my floppy doesn't want to play either.

Well done guys.
If it ain't broke, test it to Destruction.

PeteW
Posts: 76
Joined: Wed Jul 25, 2018 8:09 pm

Re: ALPHA MODIFICATIONS

Post by PeteW » Wed Sep 26, 2018 6:16 pm

Forgottenmyname wrote:
Wed Sep 26, 2018 5:47 pm
I can verify that those fixes work on my board too.

And as with Icky's my floppy doesn't want to play either.

Well done guys.
Does your display do that periodic blanking like Ickys too or is your picture stable?

I've really enjoyed watching the progress of this from virtually no picture to a nearly functional machine in under 2 weeks :)

If I had a spare motherboard, I'd be well up for being a beta board customer!

PhilC
Trusted Guru
Trusted Guru
Posts: 1450
Joined: Fri Mar 23, 2018 8:22 pm

Re: ALPHA MODIFICATIONS

Post by PhilC » Wed Sep 26, 2018 6:39 pm

I don't remember seeing it flicker like on the video.

I will try running it again a little later on and see what happens.

I'm wondering if it's a difference in monitor type?
If it ain't broke, test it to Destruction.

User avatar
exxos
Site Admin
Site Admin
Posts: 6953
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: ALPHA MODIFICATIONS

Post by exxos » Wed Sep 26, 2018 11:50 pm

FLOPPY FIX

Fixies missing pull ups on the LS06 buffers (never were on any schematic either!)

Solder 10K resistors to either the IC on the bottom of the PCB, or the resistors in a row on top of PCB (which ever is easier).

For example solder a 10K resistor to the highlighted pins on the resistors, then solder the free ends to 5V (tap from pin 14 of LS7406)


1772f.jpg
1772f.jpg (92.28 KiB) Viewed 735 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
Icky
Moderator
Moderator
Posts: 1154
Joined: Sun Sep 03, 2017 10:57 am
Location: UK

Re: ALPHA MODIFICATIONS

Post by Icky » Thu Sep 27, 2018 12:09 am

exxos wrote:
Wed Sep 26, 2018 11:50 pm
FLOPPY FIX

Fixies missing pull ups on the LS06 buffers (never were on any schematic either!)

Solder 1K resistors to either the IC on the bottom of the PCB, or the resistors in a row on top of PCB (which ever is easier).

For example solder a 1K resistor to the highlighted pins on the resistors, then solder the free ends to 5V (tap from pin 14 of LS7406)
Here is a photo of my quick hack to get this up and running - a cluster of resistors tied to pin 14:

IMG_3115.png
IMG_3115.png (1.38 MiB) Viewed 730 times

PhilC
Trusted Guru
Trusted Guru
Posts: 1450
Joined: Fri Mar 23, 2018 8:22 pm

Re: ALPHA MODIFICATIONS

Post by PhilC » Thu Sep 27, 2018 10:19 am

The stripes don't match up :P

Does it need to 1k? I'm running short on those by the looks.
If it ain't broke, test it to Destruction.

User avatar
exxos
Site Admin
Site Admin
Posts: 6953
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: ALPHA MODIFICATIONS

Post by exxos » Thu Sep 27, 2018 10:49 am

Forgottenmyname wrote:
Thu Sep 27, 2018 10:19 am
Does it need to 1k? I'm running short on those by the looks.
No idea. I suggested 10K to Icky.. I guess almost anything would work, even 100K maybe .
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.

PhilC
Trusted Guru
Trusted Guru
Posts: 1450
Joined: Fri Mar 23, 2018 8:22 pm

Re: ALPHA MODIFICATIONS

Post by PhilC » Thu Sep 27, 2018 4:22 pm

If you've kept up, your board should now look a little something like this :)
20180927_162013.jpg
20180927_162013.jpg (4.05 MiB) Viewed 684 times
P.s. not done the 16mhz mmu fix as it was optional.
If it ain't broke, test it to Destruction.

Post Reply