ALPHA MODIFICATIONS

STF clone project.
User avatar
exxos
Site Admin
Site Admin
Posts: 4995
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: ALPHA MODIFICATIONS

Post by exxos » Fri Sep 21, 2018 9:46 pm

16MHZ OPTIONAL FIX

I noticed the MMU 16MHz line isn't actually buffered via the 74F04.. Which was actually part of its intention.. :roll: I am classing this as a optional fix as it should not affect anything much..

The fix is simple, lift the yellow end leg of R910 , connect a small wire from the now lifted side, and connect the other end of the wire to pin 10 of the 74F04 (IC900) as circled in red.

f1.JPG
f1.JPG (124.11 KiB) Viewed 302 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.

TheNameOfTheGame
Posts: 10
Joined: Tue Dec 05, 2017 5:49 pm

Re: ALPHA MODIFICATIONS

Post by TheNameOfTheGame » Sat Sep 22, 2018 4:50 am

I know there are several fixes documented here, but for a 1 man job, you have done great!

I can imagine engineers at Atari Corp going through all this revision testing lol. Here you are doing it all with just a few brave volunteers.

Great props to you and all the testers. :cheers:

User avatar
exxos
Site Admin
Site Admin
Posts: 4995
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: ALPHA MODIFICATIONS

Post by exxos » Mon Sep 24, 2018 11:22 am

GLUE DATALINE FIX

A "good" mistake here.. While GLUE states D0 & D1 on the GLUE itself, the actual data lines are D8 & D9! So nothing will be setup right internally on the GLUE and pretty much everything it controls will be "wrong" because it will be getting bad data. The fixes are thankfully not too bad...


STEP 1

Cut D0 & D1 tracks on the bottom of the PCB as highlighted with the redline.
cc1.JPG
cc1.JPG (322.61 KiB) Viewed 251 times


STEP 2

Cut the track on the top of the PCB as highlighted with the red line.
c2.JPG
c2.JPG (51.65 KiB) Viewed 251 times


STEP 3

Connect a bodge wire from the glue to the resistor pack as highlighted the redline.
w1.JPG
w1.JPG (233.7 KiB) Viewed 251 times


STEP 4

Connect a bodge wire from the CPU to the resistor pack as highlighted the redline.
w2.JPG
w2.JPG (244.78 KiB) Viewed 251 times


STEP 5

Connect a bodge wire from the glue to the resistor pack as highlighted the redline.
w3.JPG
w3.JPG (270.84 KiB) Viewed 251 times


Done :)

What we basically have done is rewired the GLUE's D0 to D8, and D1 to D9.

Hopefully this will solve a great number of issues :)

Thanks for playing Atari :) :lol:
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: 4995
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: ALPHA MODIFICATIONS

Post by exxos » Mon Sep 24, 2018 1:22 pm

MFP FIX

Fixes missing pull up resistor on MFP pin 32 (IRQ).


Solder a 1K resistor on the bottom of the PCB connected between the highlighted yellow circles.
mpfpu.JPG
mpfpu.JPG (233.68 KiB) Viewed 230 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
Trusted Guru
Trusted Guru
Posts: 814
Joined: Sun Sep 03, 2017 10:57 am
Location: UK

Re: ALPHA MODIFICATIONS

Post by Icky » Mon Sep 24, 2018 10:12 pm

GLUE DATALINE FIX - Patch in place on board. Also shows the pull up fix as well.

IMG_3100 (1).png
IMG_3100 (1).png (983.25 KiB) Viewed 194 times

User avatar
Icky
Trusted Guru
Trusted Guru
Posts: 814
Joined: Sun Sep 03, 2017 10:57 am
Location: UK

Re: ALPHA MODIFICATIONS

Post by Icky » Mon Sep 24, 2018 10:13 pm

exxos wrote:
Mon Sep 24, 2018 1:22 pm
MFP FIX

Fixes missing pull up resistor on MFP pin 32 (IRQ).


Solder a 1K resistor on the bottom of the PCB connected between the highlighted yellow circles.

mpfpu.JPG
Patch in place:

IMG_3092.png
IMG_3092.png (1.14 MiB) Viewed 192 times

User avatar
exxos
Site Admin
Site Admin
Posts: 4995
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: ALPHA MODIFICATIONS

Post by exxos » Tue Sep 25, 2018 2:21 pm

RAM RW FIX

Fixes wrong RW line connected to RAM.

STEP 1

Cut track on top of PCB as shown below.
tc1.jpg
tc1.jpg (113.91 KiB) Viewed 167 times

STEP 2

Bodge wire connected as shown below in red.
br1.jpg
br1.jpg (206.42 KiB) Viewed 167 times

STEP 3

Pray to whichever god you believe in, or do a ritual chicken sacrifice and voodoo dance.. or do both to be sure... (uploading such events to youtube is also recommended).
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
Trusted Guru
Trusted Guru
Posts: 684
Joined: Fri Mar 23, 2018 8:22 pm

Re: ALPHA MODIFICATIONS

Post by Forgottenmyname » Tue Sep 25, 2018 5:49 pm

LMAO at chicken sacrifice. I take it with the MMU ram board I won't need to do this? probably still do it anyway?

User avatar
exxos
Site Admin
Site Admin
Posts: 4995
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: ALPHA MODIFICATIONS

Post by exxos » Tue Sep 25, 2018 6:06 pm

Forgottenmyname wrote:
Tue Sep 25, 2018 5:49 pm
LMAO at chicken sacrifice. I take it with the MMU ram board I won't need to do this? probably still do it anyway?
That's a point, it shouldn't affect a plug in MMU RAM board...
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
Trusted Guru
Trusted Guru
Posts: 684
Joined: Fri Mar 23, 2018 8:22 pm

Re: ALPHA MODIFICATIONS

Post by Forgottenmyname » Tue Sep 25, 2018 6:09 pm

But I am getting corruption that I didn't have when I just had the E7 error repeating.

I'll do the patch anyway, for continuity but I think we might need to look somewhere else too.

Post Reply