alps.tw Type OA2
|Sense method||Metal leaf|
|Keycap mount||Alps mount|
|Switch mount||Plate mount|
alps.tw Type OA2, formerly Simplified Alps Type IV, is the designation given to a type of four-tab clone switch. Study has indicated that there are in fact at least two subtle varieties of this switch, with one more closely resembling the Tai-Hao APC series switch on which it may have been based.
The OA2's designation may come from an assumption that the switch was a derivative of Type OA1, when it is more likely that OA1 is a rare derivative of OA2 designed to resemble a real Alps switch.
OA2 was previously referred to as Simplified Alps Type IV, but as it is not an Alps switch, nor the fourth type of anything, it makes more sense to use the alps.tw designation.
|Front contact plate: square, with one finger, and top and bottom reinforcement recesses|
|Shell: Four-tab clone|
- Lion Tech DS-2006 (1993)
- NTC KB-6153EN
- Some Focus FK-2001 keyboards (dated to 1993)
- MacAlly MK96
Lion Tech DS-2006 CHN 101 (1993)
This DS-2006 keyboard appears to use a later version of the switch.
Front top view; note that, like other switches presumed to be from Himake, the mould numbering is placed "upside down"
Rear (stationary) contact partially located into its groove in the upper shell; note the APC-style recess reinforced leg