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Builder68's latest activity
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
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Good Catch! Linking that schematic was worth it! I have to say, I find the way you use chat very enjoyable, like a kind of log of the...
Friday at 10:50 PM
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
FYI, those ICs are also used in the 3MB RAM expansion board for the Macintosh Classic (Made by Garrett's Workshop) The design (Kicad)...
Friday at 9:55 PM
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
Hey, those ICs can be found on Aliexpress, Amazon or EBay! (By the way, I snagged a couple already to play around with your design as...
Friday at 9:19 PM
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
You're absolutely right about the refresh rates! I completely missed that aspect. Regardless, your explanation was incredibly helpful...
May 2, 2024
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
I'm also considering the KM44C4100 (4Mb x 4bit), in order to keep the CAS generation unmodified.
May 2, 2024
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
I got curious. Are there any reasons why the bigger 1MB x 16-bit CMOS FAST PAGE RAM ICs, like the ones in some Mac Classic/SE memory...
May 2, 2024
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
Last night I also watched latest Adrian's video (Very well done, funny and entertaining, by the way, as are his videos usually). I...
May 2, 2024
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
...
May 1, 2024
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
Absolutely, moving to a PCB layout sounds like the way to go! On the topic of the ~CAS lines, pulling them high on the PCB can be very...
Apr 28, 2024
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
Apr 28, 2024
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
I just want to confirm, did you cut the traces to pins 12 and 13 of the TSM chip?.
Apr 28, 2024
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
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One way to simplify your prototype could be instead of using individual 1Mb DIPs, get a 3MB or 1MB w/ SIMM sockets RAM expansion board...
Apr 26, 2024
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
I actually considered reverse engineering the Dove MacSnap RAM expansion board a while back. Luckily, I have some high-resolution...
Apr 26, 2024
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Builder68
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
It sounds like you've put a lot of thought and effort into designing this memory upgrade board! While I'm no expert like you, here are...
Apr 26, 2024
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Builder68
replied to the thread
Macintosh 512ke Theoretical Ram Upgrade
.
In the late 1980s, many tech enthusiasts and repair technicians commonly upgraded the onboard RAM of early Macintosh models. This...
Apr 24, 2024
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