UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Problems with your machine in general.
lrodriguezrullan
Posts: 59
Joined: Sun Mar 10, 2019 3:54 am
Location: Colorado, USA
Contact:

UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by lrodriguezrullan »

I am having trouble with this kit. I am getting a black screen on my 1040 STF.

I did check that every pin on the cable is connected to a pin on the shifter board. It seems to be OK. I lifted the R59, R60, R61, R71, R72, and R73 resistors and connected them to 5V.
User avatar
exxos
Site Admin
Site Admin
Posts: 24083
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by exxos »

Please post a image of it all..
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
User avatar
DoG
Posts: 1148
Joined: Sat Apr 07, 2018 12:26 pm

Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by DoG »

Should be R60, R61 for bank 1 and R71, R72 for bank 2 to be disabled. But it all depends on motherboard revisions.

EDIT: Hmm, checked exxos blogpost about fitting the 4MB expansion and you have done what he has done so I don't know. According to Marpet/Frontier board you leave out R59 and R73.
User avatar
exxos
Site Admin
Site Admin
Posts: 24083
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by exxos »

We need a image of what he has and done.

http://www.exxosforum.co.uk/atari/last/4MBMMU/index.htm

As resistor numbers and even orientation of the MMU can be different across motherboard revisions.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
lrodriguezrullan
Posts: 59
Joined: Sun Mar 10, 2019 3:54 am
Location: Colorado, USA
Contact:

Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by lrodriguezrullan »

Please find some photos of what I did.
Attachments
65C01187-CBD7-4391-B8B7-3B8440411033.JPG
65C01187-CBD7-4391-B8B7-3B8440411033.JPG (119.24 KiB) Viewed 4175 times
687B2068-4899-40A8-9B99-378792BE9CB4.JPG
687B2068-4899-40A8-9B99-378792BE9CB4.JPG (103.94 KiB) Viewed 4175 times
81D8E264-9615-4831-9D39-2ADE480F70C5.JPG
81D8E264-9615-4831-9D39-2ADE480F70C5.JPG (97.52 KiB) Viewed 4175 times
07CA5803-151C-4BDC-8707-A965F95A67B4.JPG
07CA5803-151C-4BDC-8707-A965F95A67B4.JPG (100.34 KiB) Viewed 4175 times
8DB6469C-2ABE-4C8D-ABF3-DB8F9C6E6820.JPG
8DB6469C-2ABE-4C8D-ABF3-DB8F9C6E6820.JPG (143.53 KiB) Viewed 4175 times
8DB6469C-2ABE-4C8D-ABF3-DB8F9C6E6820 2.JPG
8DB6469C-2ABE-4C8D-ABF3-DB8F9C6E6820 2.JPG (143.53 KiB) Viewed 4175 times
User avatar
exxos
Site Admin
Site Admin
Posts: 24083
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by exxos »

Do you have higher resolution images you can send me in PM ? ( you may need to zip them if large images wont upload)
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
lrodriguezrullan
Posts: 59
Joined: Sun Mar 10, 2019 3:54 am
Location: Colorado, USA
Contact:

Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by lrodriguezrullan »

I don't have better photos right now. I will have to retake them.
lrodriguezrullan
Posts: 59
Joined: Sun Mar 10, 2019 3:54 am
Location: Colorado, USA
Contact:

Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by lrodriguezrullan »

Is there something that you are looking for that I can clarify, while I retake the photos? Thanks.
User avatar
exxos
Site Admin
Site Admin
Posts: 24083
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by exxos »

lrodriguezrullan wrote: Mon Mar 11, 2019 9:56 pm Is there something that you are looking for that I can clarify, while I retake the photos? Thanks.
1st and 4th image...

It looks connected up right, but cant tell much else form the images currently.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
lrodriguezrullan
Posts: 59
Joined: Sun Mar 10, 2019 3:54 am
Location: Colorado, USA
Contact:

Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by lrodriguezrullan »

I just sent you the higher resolution images via private message.

I wasn't sure about my soldering, so I used a multitester to test continuity from each pin in the ribbon cable to the shifter socket. The results are as follows:

Cable 1 -> Socket 32
Cable 2 -> Socket 33
Cable 3 -> Socket 34
Cable 4 -> Socket 35
Cable 5 -> Socket 36
Cable 6 -> Socket 37
Cable 7 -> Socket 38
Cable 8 -> Socket 39
Cable 9 -> Socket 30
Cable 10 -> Socket 29
Cable 11 -> Socket 28
Cable 12 -> Socket 27
Cable 13 -> Socket 26
Cable 14 -> Socket 25
Cable 15 -> Socket 24
Cable 16 -> Socket 23

That is assuming that the cable pins are numbered 1 to 16 from left to right and that the socket pins are numbered from 1 to 40 counter clockwise starting with the bottom left corner of the socket.

Does this look correct?
Locked

Return to “HARDWARE ISSUES”