Costar Matrix

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All(?) Costar keyboards share the same key matrix. Row and column orders have been chosen to correspond to the pin order of the Filco Majestouch full size keyboards.

Using hasu's notation, the matrix looks like this

Matrix 

Col 0 Col 1 Col 2 Col 3 Col 4 Col 5 Col 6 Col 7
Row A no RCTL no no LCTL BRK no F5
Row B F12 ENT BSPC BSLS F9 (bsp2) F11 F10
Row C RALT no no no no SLCK LALT PSCR
Row D APP DOT F7 L F8 O no 9
Row E (braz) COMM RBRC K EQL I F6 8
Row F N M Y J 6 U H 7
Row G B V T F 5 R G 4
Row H no C F3 D F2 E F4 3
Row I no X CAPS S F1 W NUBS 2
Row J no Z TAB A GRV Q ESC 1
Row K DOWN NLCK P4 P1 DEL P7 SPC no
Row L RGHT PSLS P5 P2 INS P8 P0 no
Row M no no no RGUI no (kc_l) no (kc_r)
Row N no no LSFT RSFT no no no no
Row O LEFT no no PENT HOME PPLS UP END
Row P no no LGUI no no no no no
Row Q PMNS PAST P6 P3 PGUP P9 PDOT PGDN
Row R SLSH no LBRC SCLN MINS P QUOT 0

The keys (kc_r), (kc_l), (braz), and (bsp2) all have switch locations on at least some of the main boards. (kc_r) and (kc_l) are for Japanese layouts, (bsp2) is the left part of a split backspace key, and (braz) the key appearing on Brazilian keyboards left of right shift.


Schematic

A schematic of the costar matrix