Casio AS-8A

The Casio AS-8A is a pretty early Vacuum- Fluorescent display calculator, introduced in September of 1971. This particular machine was manufactured in the late part of 1971, making it a rather early example of the machine. The AS-8A uses rather different 8-segment individual VF (Vacuum Fluorescent) display tubes. The display renders digits in conventional seven-segment form, with the exceptions being '4', which uses the eighth small segment to give the horizontal bar of the 4 an extra little tail to the right of the long vertical bar, and the other is the '0', which is shown in 'half-height' form. Aside from the somewhat unusual display elements, the Casio AS-8A is otherwise quite conventional for its time.