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Golden Potato's latest activity
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
This has got to be one major reason why my breadboard prototype didn’t work. I know I should just finalize the next schematic and lay...
May 9, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
My mind wandered back to this project while I was at work today, and I couldn't help but think about how the technique I'm borrowing...
May 9, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
I'm working on the schematic redraw, and I have an idea for connecting the ~OE pins on the DRAM ICs like the Mac Classic RAM expansion...
May 6, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
Thanks! It can be a little meandering at time, but I find talking (or typing) my thoughts out loud helps me understand them better...
May 5, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
Agreed, that’s a great sign that it should work for this project! Thanks for sharing this. I saw a blurb in the schematic in the linked...
May 3, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
Awesome! Okay, so I’m back to this chip. 😆
May 3, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
I’m having a hard time finding where these can be purchased. I found an alternative on Mouser, but it’s 3.3V only and the inputs are not...
May 3, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
What I meant in the part about refresh rates was more about the address lines than actual rates. I was originally confused about that...
May 2, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
We would need to use four of these 4Mb chips just to have the correct number of data bits, and I think it would end up providing 8MB of...
May 2, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
I’m pretty sure I bought mine on eBay. I don’t reallly remember my reasoning for settling on that part other than the low price. I...
May 2, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
This PDF talks a little about the SCSI section of the Mac Plus, and includes details on the memory map...
May 2, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
I found this build thread for reverse engineering a MacSnap SCSI card. It uses some clever, slightly complicated, hacks to make it work...
May 2, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
A feature that the memory expansion board Adrian found on that 512K logic board was that you could hold the mouse button down at power...
May 2, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
Adrian Black released a follow up video to the memory upgrade board on a Mac 512K logic board he was fixing up (I believe these are on...
May 2, 2024
G
Golden Potato
replied to the thread
Early Macintosh home brew 4MB memory upgrade board development
.
No I did not. I see that they (~CAS0 annd ~CAS1) aren’t necessary to take back to the logic board and could instead be pulled up high...
Apr 28, 2024
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