Look under the monitor bezel on the front for a serial number sticker. The letter after the M0001 number will tell you what model your machine started out as.

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Quadraman, you don't read too closely do you? :beige:

He's already decoded the serial number and it began as a 512K. Hyperdrive Macs required 512K RAM and almost always came inside 64K ROM Macs because of the nature of the MFM drives. The 128K ROM gave easy access to SCSI so that became preferred standard.

Note that HyperDrive replaced not only the 512K logo, but also the agency label. It's hard to tell from that Picture whether they pulled off the Apple label or merely pasted over it. The gray sticker across the agency label was meant for the front of the Mac.

The interesting thing about the HyperDrive was that it was one of the few third party mods that did not void warranty. Apple mentioned it in their service manuals at the time.

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LOL, yes. That's because Apple used them themselves. However, they didn't cover it at first, but relaxed their position after they realized the HyperDrive was one of the only reasons why people were buying the Macs instead of PCs which came standard with hard drives. It's also the reason Apple got busy developing the HD20 which Jobs insisted be an external drive rather than add a fan to the Mac.