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This is possibly due to the lowest motherboard 1MB being shared between ROM and RAM (ROM overlays it at reset to allow the machine to start even with RAM in a non-deterministic state), as well as at least one ROM bug that makes heavily expanded units sluggish when exiting sleep. (Sometime in the near future I'll dig out my Data General One, a fine example of the opposite extreme.) It has an Androda 7MB expansion card to give it 8MB of RAM, just shy of the 9MB maximum it was capable of addressing, though no card sold for the Portable back in the day could achieve this and even the 9MB RAM cap is problematic.
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Naturally, being a pre-production prototype it's also not a backlit model - that of course came later - but the 640x400 screen remains excellent, an early example of an active matrix LCD that Apple boasted had an individual transistor for every pixel and one of the best displays on any portable machine from the period. Though high performance and with some innovative features, the Portable's biggest drawbacks - literally - were its size and its heavy lead-acid battery, and it sold barely a fifth of what it was expected to. In architectural terms Apple described the Portable as an evolved Macintosh SE. That puts this serial-less unit's manufacture likely somewhere around spring '89. The Portable was not officially released until September 1989 simultaneously with the Macintosh IIci, where the base 1MB/floppy configuration started at $5799, or $6499 with one of those loathsome Conner hard disks (approximately $14,400 and $16,150 respectively in 2024 dollars).
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I know of a couple other Macintosh Portable prototypes out there in collector's hands, though if you've got a Mac Portable yourself of any age, they all hail from that unpleasant turn-of-the-decade era where virtually all period Apple hardware will require new capacitors (everything in this one has been completely replaced). The only thing that doesn't work properly on this machine is the audio, which even after capacitor replacement remained unusually quiet, though I don't recall that it ever worked during its time in my possession. Since FCC certification usually occurs after hardware development is complete but before mass production begins, this makes it most likely a DVT unit. Production units will comply with all applicable Federal Rules and Regulations." That last sentence would imply it isn't a production unit, meaning it's not at PVT stage, but it is clearly more developed than an EVT prototype would be. Federal Communications Commission clearance, complete with a warning applique that says "ATTENTION! This unit is a demonstration unit only.