[Mitsuru Yamada] states that one of many targets for this 6502 computer build was to make it sturdy sufficient to outlive real-world utilization. In that regard alone we’d name this successful; the die-cast aluminum enclosures used a bit of blast from the previous and lend a pleasant retro industrial look to the venture. The primary chassis of the pc pretty bristles with LEDs and chunky toggle switches for setting the info and deal with busses. The inside is not any much less tidy, with the 6502 microprocessor — date code from 1995 — and related assist chips neatly organized on perf board. The development technique is wire wrapping, consistent with the old-school feel and look. Even the hand-drawn schematic is a murals — shades of [Forrest Mims].
As for programming, this machine is as low-level because it will get. Nothing however 6502 machine language right here, entered manually with the toggle switches, or by way of an externally programmed ROM. The machine can solely deal with 1k of reminiscence, a restrict which the code to assist the RPN calculator add-on [Yamada] additionally constructed brushes up towards, at 992 bytes. The calculator keypad has a 20-key matrix pad and an eight-digit dot-matrix LED show, and may do the 4 fundamental operations on fixed-point binary-coded decimal inputs. The transient video under reveals the calculator in motion.
We love the look of this construct and we’re desperate to see extra prefer it. We’ve seen a ton of 6502 builds from discrete chips these days, and whereas we love these too, it’s good to see one of many huge previous DIPs put again in motion for a change.