Are the shifitings related to floppydrive activity?
Whining noises are usally BU406 or the flyback.
Wiggles on display can be caused by a bad BU406.
Try replacing BU406 and confirm ground is connected to the chassis.
That's nice of you, thank you!
Many people don't understand how much work it is to get to an end result of a recreation. Many take these kind of boards for granted, while developing such boards takes months of work. In addition, the costs can never actually be recouped. I see it as a gift to...
Regarding this threat the A/B yokes may be interchangeable pinwise, but i did not test that so i can not conform that. This board is a replica with the B-type yoke.
https://68kmla.org/bb/index.php?threads/the-compact-mac-crt-guide.8543/page-2
Apple did use mainly the early revision for the Classic I, and the late revision for Classic II, although i have seen the other way around.
I am not 100% sure if that is a later boardswap or a factory thing. Nevertheless; They are interchangeable.
I've been working on recreating the Macintosh Classic late revision analog board for quite a while.
This board can be reconfigured to both 110V as 240V, although i have not test 110V setup yet. This revision board should be able to replace any Classic I or II revision (early/late) analogboard...
I've been working on recreating the INTERNATIONAL (revision D) analog board for quite a while.
This INTERNATIONAL board can be reconfigured to both 110V as 240V, although i have not test 110V setup yet. This revision board should be able to replace any revision (A/B/C/D) board, both US as...
https://github.com/TheRealBolle/SE30/tree/main/PALs
For the VROM: maybe you can find a binary online, either create one yourself when you need a clone.
Hi all!
I cant find the value of resistor R62 anywhere. It looks like the part is not described in old schematics or any other available source.
Any other of my A- B & C-revision boards don't have this resistor by design, so i am not able to crosscheck:(
Is somebody able to tell what the value...