On a sunny day (Fri, 26 Jun 2020 15:24:32 +0100) it happened Ahem A Rivet's
Shot  wrote in
:

>On Fri, 26 Jun 2020 14:30:33 +0100
>David Higton  wrote:
>
>> As for PCB traces: I discovered in the early 1990s, when we were
>> using 74ABT logic devices, which have nanosecond rise and fall times,
>
>        Around 1980 two of us assembled wire-wrap prototype memory boards
>(stuffed with 2kx8 SRAM and 74LS logic) the other guy was an experienced
>wireman who made a lovely job of it, the looms of address and data bus were
>really clear. I was a student and not so inclined to making things pretty,
>every wire made the correct connection but they went all over the place in
>a rat's nest. On first sight the boss commented that his was the way it
>should be and I needed to do better - fair enough I thought - his was
>pretty.

30 MHz has a wavelength of 10 meter.
for distances on an eurocard (100x160 mm) board the transmission line issue is
not very significant.
 http://panteltje.com/pub/z80/graphics_card_top.jpg
Watch your decoupling though, impedances:
 http://panteltje.com/pub/z80/graphics_card_bottom.jpg
Keep cross track capacitance low.

I have done some wirewrap but did not really like it,

Here a fast RAM disk from those days:
  http://panteltje.com/pub/z80/ramdisk_top.jpg
Short wires, just stack the chips.

Things I soldered together in the evening..
At work we had pee see bees made... took a while,
Mine worked in a few hours, did prototyping like that at work too,
then had the pee see bees made.

I still prototype like that, also at GHz.
wavelength

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