Oli W 🌱Apr 22, 2023

Taking a punt on a custom prototyping board design with an #rc2014 slant.

Only 38 pins wide as it's a push to fit 40 on the 100x100mm $5 form factor at the well known PCB house.

It's based on Troy Schrapel's HBC-56 design (https://github.com/visrealm/hbc-56/tree/master/schematics/proto). Took me *ages* to recreate it in KiCad from the picture of the original board.

hbc-56/schematics/proto at master · visrealm/hbc-56

Homebrew 6502 on a backplane computer. Contribute to visrealm/hbc-56 development by creating an account on GitHub.

GitHub
Show threadOli W 🌱Apr 27, 2023
The real thing showed up today, seems good.
Show threadGiles Goat
@evolutional It looks REALLY GOOD .. but .. there is "the problem" .. "where are the DIL 74XX chips ?" .. My "progression" ( into DESPAIR ) went from DIL -> SMD -> 74xx can't find them so many any more -> CPLDs -> Xilinx -> Altera -> PLCC44 -> 5V -> 3.3V -> VQFP/TQPF 44 -> Microscope -> Adapters -> TOO TINY ! AAAAAARGH ! I survive with some "stock" I bought long ago ( and very hard to find now ) Still have to try alluminium stencils + adapters + heat gun .. the problem components are ( CONT )
Apr 27, 2023 at 9:47amWeb
Show threadGiles GoatApr 27, 2023
@evolutional getting smaller and smaller and harder and harder to solder, also when doing "small computers" the number of chips is quite a thing cause bus transceviers/drivers to increase the fan-out I mean you can put rom/ram/cpu etc in a board but then you need a bus that can drive something, could not find yet "a decent SerDes" for "home use" and attempt a fast serial bus.
Show threadOli W 🌱Apr 27, 2023
@gilesgoat the pain is real :(