HN Explorer

3 comments

[ 3.2 ms ] story [ 19.3 ms ] thread
FullyFunctional
Provenance: There was a recent post about PiDP-11 which is awesome in itself, but the page led to this which is probably more remarkable than is apparent at first; a Single Board Computer which implements all logic in TTL and with a remarkable functionality given the relatively few chips.

There are many SBCs of the era using more chips that this, despite having a Z-80 or 6502 onboard.

IWeldMelons
I bet these are built with 74HCxx ICs, which are not TTL whatsoever; in fact they are CMOS.
ttldude
You can build them with 74xx, 74LSxx as well as 74HCTxx, or mix those. Mixing with 74HC is also possible if you're careful, but full 74HC won't work.