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How to even start routing this?
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tggzzz:

--- Quote from: ejeffrey on August 02, 2019, 12:35:12 pm ---
--- Quote from: tggzzz on August 02, 2019, 08:33:09 am ---
If you do, make one layer a solid ground plane and another a solid Vcc plane. If they are inner planes then it is easier to probe and modify signals. If they are outer planes then EMI problems will be minimised. Choices, choices :)
)

--- End quote ---

Hardly a choice.  The EMI advantage of outer planes is hardly worth the ease of debug and tracing for what I assume is a one off. Plus for a project that is basically intended to show off old school 74 series logic design, it hard to give up the appearance of a nicely routed board for solid planes.

--- End quote ---

Agreed. But the OP hadn't bothered to divulge that information when I wrote that post.
SiliconWizard:
Just a tip, didn't really look closely how well your autorouter did, but if using autorouting, I would first hand-route all bypass caps and power supplies, then let the autorouter handle the rest. Autorouters can do a pretty atrocious job at routing supplies, and often like to create horrible loops, especially on a 2-layer board.

Of course to be half successful at routing this, placement will be key.
Joanna_H:

--- Quote from: ejeffrey on August 02, 2019, 12:35:12 pm ---
--- Quote from: tggzzz on August 02, 2019, 08:33:09 am ---
If you do, make one layer a solid ground plane and another a solid Vcc plane. If they are inner planes then it is easier to probe and modify signals. If they are outer planes then EMI problems will be minimised. Choices, choices :)
)

--- End quote ---

Hardly a choice.  The EMI advantage of outer planes is hardly worth the ease of debug and tracing for what I assume is a one off. Plus for a project that is basically intended to show off old school 74 series logic design, it hard to give up the appearance of a nicely routed board for solid planes.

--- End quote ---

Yeah, it's one off, showing off old 74 series, easier for someone looking at it to comprehend (well, the ic's at least.)   
Joanna_H:

--- Quote from: voltsandjolts on August 02, 2019, 01:02:19 pm ---4 layers will save your sanity.

pcbshopper.com is your friend. (no affiliation).

--- End quote ---

Thanks for the link..  cheapest for a 2 layer with delivery is about £20, cheapest for a 4 layer with delivery is about £40

So ... hmmm...
mikeselectricstuff:
Placement
Placement
Placement
Gate and pin-swapping for multi-gate packages, swapping gates between packages where possible.

Do you really need to keep it to two layers ?
How many of these are you making? - unless it's thousands then your time getting to 2 layers is probably worth mor than the additonal cost of 4 layers , bearing in mind that it can probably be smaller on a 4L PCB as well.
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