How come the cursor keys don't work in Macwrite? (Or am I missing some key combination?) This keyboard is model M0110A. Is that original to this model?
The Mac itself shows a model number of M0001W on the back lid, and has the Macintosh 512K logo, but under the screen the label reads just M0001. The serial number also ends just in M0001, and indicates a manufacture date during the 21st week of 1984, which is the middle of May, several months before the model was introduced, I think. So does that mean this is a 128K that was upgraded after the fact, or upgraded in the factory before being sold, or somewhere inbetween? Or is the only way to really tell to look at the logic board?
For details on these early machines, I put everything I could find out here:
http://homepage.mac.com/chinesemac/earlymacs/
As Stuart said, yours sounds like a Mac 128K and a 512K were combined, and the keyboard was replaced with a M0110A keyboard. Stuart and Antonio are right that the M0110A keyboard only came with the Plus--it was never sold with the 512Ke, not even the 1987 edition of the 512Ke with the second-revision ROMs. But Apple also sold it separately as an upgrade "kit"--it is mentioned at the end of the BYTE preview of the Mac Plus:
http://www.byte.com/art/9606/sec5/art2.htm
I gather your internal drive is still 400K. So the short answer is yes, you will have to open it up to see what you've got. The 400K drive will have a different insert/eject mechanism if it is from the May 1984 machine as opposed to the 512K machine. See my notes on this about the model numbers (OA-D34V vs. OA-D34V-22)--sorry I never got around to taking pictures, but the earlier mechanism has lots of plastic parts, while the later mechanism is mostly metal.
I'm not sure which System/Finder was the first to handle the cursor keys, but System 3.0 Finder 5.1 and above would work, of course. System 3.2 Finder 5.3 is probably best for what you've got. I think the early Mac Plus (and 512Ke) came with MacWrite 4.5 (which had been released in April 1985 with System 2.0 Finder 4.1).
HTH, Eric Rasmussen
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