Which 1040 STF is this?

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exxos
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Re: Which 1040 STF is this?

Post by exxos »

Its only a simple transistor buffer type circuit which merges V & H.

1.jpg
1.jpg (55.67 KiB) Viewed 4812 times

NOTE that is from a "ST" so part numbers are likely different on your board, but the circuit will be the same.
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32bitminus
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Re: Which 1040 STF is this?

Post by 32bitminus »

Thanks this is perfect!

Looks like I need...

ST Location, Part, STF Location

Resistors (Need to follow traces to STF Location first):
R129, 10k, R49 (Brown, Black, Orange, Gold)
R130, 150, R50 (Brown, Green, Brown, Gold)
R131, 100, R51 (Brown, Black, Brown, Gold)


Transistor:
Q10, 2N3904, Q8

Diodes:
CR9, IN914, CR10
CR10, IN914, CR11

I have not studied electronics in ages, so thanks for the patience ;)
exxos wrote: Thu Feb 21, 2019 8:18 pm Its only a simple transistor buffer type circuit which merges V & H.


1.jpg


NOTE that is from a "ST" so part numbers are likely different on your board, but the circuit will be the same.
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Cyprian
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Re: Which 1040 STF is this?

Post by Cyprian »

32bitminus wrote: Thu Feb 21, 2019 6:49 pm
Image
interesting, there is no BLiTTER's socket
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Re: Which 1040 STF is this?

Post by 32bitminus »

I thought that was normal on the Blitter, bigger question for me, I know nothing about Mega STs, are the roms the same?
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Re: Which 1040 STF is this?

Post by exxos »

32bitminus wrote: Thu Feb 21, 2019 10:09 pm I thought that was normal on the Blitter, bigger question for me, I know nothing about Mega STs, are the roms the same?
There is 6 chips and 2 chips TOS, All "ST" ranges have one or the other, generally TOS 1.00, 1.02, 1.04. They are all the same.
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.
32bitminus
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Re: Which 1040 STF is this?

Post by 32bitminus »

About to order parts, this looks like 1/4 Watt resistors would go in the composite sync circuit does anyone know if this is correct?
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Re: Which 1040 STF is this?

Post by exxos »

32bitminus wrote: Thu Feb 21, 2019 10:27 pm About to order parts, this looks like 1/4 Watt resistors would go in the composite sync circuit does anyone know if this is correct?
All standard resistors yes.
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.
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JezC
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Re: Which 1040 STF is this?

Post by JezC »

32bitminus wrote: Thu Feb 21, 2019 10:09 pm I thought that was normal on the Blitter, bigger question for me, I know nothing about Mega STs, are the roms the same?
I've got 3x 1040 STFs (all with red LEDs and with long button floppy drives) & none of them have the holes for the blitter (and they all have 6x ROMs under the PSU with the RAM under the keyboard and the processor under the floppy)...but all my STFMs (small floppy buttons) do have the holes for the blitter.

My STFs all came with TOS 1.00 but my STMFs all have at least 1.02 (and some have 1.04) and most (possibly all) are the 2 ROM versions.

AFAIK the TOS version is the same regardless of the number of ROMs or whether they came from an STF, a Mega ST or an STFM.
32bitminus
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Re: Which 1040 STF is this?

Post by 32bitminus »

JezC wrote: Thu Feb 21, 2019 10:36 pm
32bitminus wrote: Thu Feb 21, 2019 10:09 pm I thought that was normal on the Blitter, bigger question for me, I know nothing about Mega STs, are the roms the same?
I've got 3x 1040 STFs (all with red LEDs and with long button floppy drives) & none of them have the holes for the blitter (and they all have 6x ROMs under the PSU with the RAM under the keyboard and the processor under the floppy)...but all my STFMs (small floppy buttons) do have the holes for the blitter.

My STFs all came with TOS 1.00 but my STMFs all have at least 1.02 (and some have 1.04) and most (possibly all) are the 2 ROM versions.

AFAIK the TOS version is the same regardless of the number of ROMs or whether they came from an STF, a Mega ST or an STFM.
Thanks! Figured as much, back in the day I had a 520STFM and that was my ST world, didn't know anyone else that had one.
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Re: Which 1040 STF is this?

Post by 32bitminus »

exxos wrote: Thu Feb 21, 2019 10:28 pm
32bitminus wrote: Thu Feb 21, 2019 10:27 pm About to order parts, this looks like 1/4 Watt resistors would go in the composite sync circuit does anyone know if this is correct?
All standard resistors yes.
Thank you sir! Starting to build up my collection of standard components ;)
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