A screenshot of Mac System 6.0.2. The About this Macintosh window shows 2,048 total memory.
https://files.mastodon.social/media_attachments/files/111/261/599/964/420/532/original/a7cf6a5022190cfe.jpeg
When I bought the ICs for the SunRem 2MB card, I missed the fact the top two chips (highlighted in yellow) are supposed to be 74LS373. Instead I stuffed 73S373 chips (note S vs LS) just like the bottom three (highlighted in red).
I finally got the LS parts and swapped those in.
Much to my surprise the card now seems to work perfectly, at least with MacWorks! 🎉✨
Thanks to @iconicbits for reminding me!
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