Preliminary notes: BASIC Rev B, 600 XL OS REV 1. The shield was held in place by two I twists, similar to the very funky CHELCO 600XL.  In fact the chip layout on this 800XL reminds me of the 600XL layout in that funky unit. The key caps are the smooth semi-gloss, reminiscent of the 1200XL or the REV3 600XLs. The keys feel stiffer to push down then the normal keyboard variant of this type.   There seems to be one less TTL chip on here than in the normal production run.  Someo
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