STe LMC mixer fix for older rev board

[Steve]

Hey guys,
@exxos kindly provided a photo of the implemented LMC fix, this is from a later revision board. Earlier revisions look a bit different
In: https://www.exxosforum.co.uk/atari/last/ ... /index.htm

STE_LMC_FIX.jpg (172.8 KiB) Viewed 2369 times

There are three resistors and I don't know how to exactly implement the fix for this board. Would appreciate any guidance.

PXL_20220206_172041009.MP2.jpg (429.16 KiB) Viewed 2368 times

[sporniket]

From the picture, I can only deduce that R526 and R532 have disappeared in later revision, others component have "survived" the revision and have kept their name.

The first thing I would do would be trying to find an early revision of the schematics that have those resistors. (it's not on the one I based my conversion)

Otherwise, I would find myself to what those resistors are connected, if it is possible.

Then once I have this alternative schematics, I would post it there to ask further guidance.

[exxos]

Maybe it was fixed in later revisions ?

STEmicrwFix.png (71.61 KiB) Viewed 2330 times

[exxos]

@Steve , can you lift the middle resistor so we can see what numbers it is ?

[Steve]

@exxos I lifted and it looks to me like R539

[exxos]

@exxos I lifted and it looks to me like R539

Would assume you can just copy what's in my image then.

[Steve]

Oki doki here we are. Not as clean as yours because I don't have miniature resistors but should be fine

PXL_20220207_121116213.MP.jpg (517.56 KiB) Viewed 2273 times

[exxos]

Looks like there are some test programs on AF. Maybe some kind soul can download them and post them in this thread so I can upload them directly onto my web page.

[Steve]

Do you mean the TESTDMA.PRG provided by metalages?

TESTDMA.zip

(1.23 KiB) Downloaded 86 times

[exxos]

Do you mean the TESTDMA.PRG provided by metalages?

This was linked to AF https://www.atari-forum.com/viewtopic.p ... 50#p252373 Maybe @Cyprian Post it the software essential section for us all.