UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

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lrodriguezrullan
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UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by lrodriguezrullan » Sun Mar 10, 2019 4:06 am

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.

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

Post by exxos » Sun Mar 10, 2019 4:10 am

Please post a image of it all..
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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DoG
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Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by DoG » Sun Mar 10, 2019 9:43 am

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.

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

Post by exxos » Sun Mar 10, 2019 11:59 am

We need a image of what he has and done.

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

As resistor numbers and even orientation of the MMU can be different across motherboard revisions.
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.

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

Post by lrodriguezrullan » Mon Mar 11, 2019 7:59 pm

Please find some photos of what I did.
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Re: UNIVERSAL ST/F/M 4MB RAM MMU ADAPTER

Post by exxos » Mon Mar 11, 2019 8:24 pm

Do you have higher resolution images you can send me in PM ? ( you may need to zip them if large images wont upload)
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.

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

Post by lrodriguezrullan » Mon Mar 11, 2019 9:54 pm

I don't have better photos right now. I will have to retake them.

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

Post by lrodriguezrullan » 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.

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

Post by exxos » Mon Mar 11, 2019 10:01 pm

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.
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.

lrodriguezrullan
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Joined: Sun Mar 10, 2019 3:54 am

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

Post by lrodriguezrullan » Tue Mar 12, 2019 4:41 am

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?

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