Budget *wide* logic analyzers?

[david.given]

I have an 8-bit CPU bus I want to snoop. This means I need a logic analyser with up to about 32 channels --- sixteen address, eight data, and a handful of data lines.

Clearly my existing budget 8-channel Saleae clone isn't going to help here. Are there any recommendations for other cheap logic analysers which might help me? I've hunted around but there appears to be a huge price gap between the 8-channel ones and anything wider.

I have thought about building my own; I have some PSoC5 dev boards, which have loads of GPIO and run at a convenient 5V. But I'd rather not!

[rstofer]

Not cheap but the Digilent Digital Discovery tool will probably do the job.  You don't necessarily need the high speed adapter right out of the gate, it depends on how fast you need to measure and for most early uCs, 200 MS/s will be more than adequate.

https://digilent.com/shop/digital-discovery-portable-usb-logic-analyzer-and-digital-pattern-generator/

There's a lot of capability in that little box.

Download and install the free Waveforms software and play with the demo device.  See the options!

[Martian Tech]

How about a vintage HP like the 1631D?  They can be found at reasonable prices.

[voltsandjolts]

I have an 8-bit CPU bus I want to snoop. This means I need a logic analyser with up to about 32 channels --- sixteen address, eight data, and a handful of data lines.

For what purpose? Reverse engineering?...but then the CPU code is perhaps already available in external FLASH/EPROM?

[david.given]

For what purpose? Reverse engineering?...but then the CPU code is perhaps already available in external FLASH/EPROM?

VLSI CPU with onboard ROM.

(I actually think this is going to be futile as the onboard ROM is probably on a different bus interface but I won't know until I look.)

How about a vintage HP like the 1631D?  They can be found at reasonable prices.

Where? The only one I can see on our favourite auction site is €400!

[Martian Tech]

How about a vintage HP like the 1631D?  They can be found at reasonable prices.

Where? The only one I can see on our favourite auction site is €400!

You haven't stated a target price range.

Patience will often result in better deals on the auction site.

There are other models.  Perhaps a 1631A or G, a 1630, 1650, 1651, 1652, 1661, 1662, 1672?  Just make sure if you do buy one that it comes with the pods/probes.