Products > Test Equipment
HP Logic Analyzer Inverse Assemblers
MarkL:
--- Quote from: gslick on March 20, 2024, 11:20:57 pm ---...
Delaying the /WR signal before it is sampled at the /MREQ and /IOREQ signal edges as used for the J and K clocks when using the 10300B Z80 preprocessor might be important if the /WR signal transition at the CPU pin can occur before the /MREQ signal transition at the CPU pin.
That appears to be occurring in the trace that I previously acquired when I scrolled forward to a memory write cycle. The rising edge of the /WR signal appears to occur around 3.25ns before the rising edge of the /MREQ signal (with the Timing Zoom sampling resolution of 250ps).
--- End quote ---
Going back in my captured data, I also see /WR going high (mumble) 8ns before /MREQ in some cases. For example, the first address byte pushed on the stack in a CALL is that way, but the second address byte has /WR coincident with /MREQ, at least as far as 4ns TZ sampling can tell. (I don't have the system set up anymore to get a more precise delay measurement.)
Fortunately, slave latch clocking on both edges of PHI saves us there too for the general probing case.
Side note: For some reason the reload of data did not restore the symbols for STAT_TZ. It was certainly there when doing the capture. Maybe a bug? Oh well... that's not getting fixed.
MarkL:
--- Quote from: Hamster on March 19, 2024, 08:06:37 pm ---This is great stuff ! Love it.. I have two large driving arcades leaving and going to setup a proper station so i can test things out and dig in and help.
--- End quote ---
All fun! Glad it's helpful for you!
gslick:
--- Quote from: MarkL on March 18, 2024, 02:27:43 pm ---
--- Quote from: gslick on March 18, 2024, 01:29:06 am ---What do you call those 1-to-4 0.1 pin header breakout connectors? I couldn't guess the correct search term to find them. Where can you get them? I could have used some of those to make it easier to attach the doubled up flying lead connections to the DIP test clip.
--- End quote ---
The part number is HP 16515-27601 "GND CONNECTOR". They're included with the 16517-68701 Master Board Accessory Kit and 16518-68701 Expander Board Accessory Kit., but only two per kit. I haven't seen them anywhere else. They're fairly handy and I'd buy a pile of them if I could find them in quantity.
--- End quote ---
Thanks for the part number.
This eBay listing photo shows two of those 16515-27601 in the item listing photo for $9.95, plus shipping. Not clear if two are included per item purchase, or only one:
Keysight 16515-27601 Ground Connector for 16517-68701 Accessory Kit
https://www.ebay.com/itm/354835319679
This eBay listing photo shows four of those in the item listing photo with some ground leads and some sort of probe for $19.95 (OBO), plus shipping. I assume in this listing everything in the item listing photo would be included. Not super cheap, but not an outrageous price if makes things easier to get probes set up.
Keysight 16515-68703 16515A 16516A 1 GHz Timing Probe Accessory Kit
https://www.ebay.com/itm/350517306271
MarkL:
--- Quote from: gslick on March 21, 2024, 05:15:16 am ---...
This eBay listing photo shows two of those 16515-27601 in the item listing photo for $9.95, plus shipping. Not clear if two are included per item purchase, or only one:
Keysight 16515-27601 Ground Connector for 16517-68701 Accessory Kit
https://www.ebay.com/itm/354835319679
This eBay listing photo shows four of those in the item listing photo with some ground leads and some sort of probe for $19.95 (OBO), plus shipping. I assume in this listing everything in the item listing photo would be included. Not super cheap, but not an outrageous price if makes things easier to get probes set up.
Keysight 16515-68703 16515A 16516A 1 GHz Timing Probe Accessory Kit
https://www.ebay.com/itm/350517306271
--- End quote ---
I saw the first listing and it seemed a bit pricey when you add in shipping, but I didn't know the ground connectors were also provided in the 16515-68703. Thanks!
Those other leads in the pouch are ground extenders, 6" M-F and fit standard 25mil posts. I have a few of those too, but I don't know where I got them. Why HP has 6" ground leads in a GHz probe set seems strange, but they are a handy accessory. With those included the package at the same price, I may have to get some. I've purchased from Global Test before. They tend to accept reasonable offers when buying a quantity, and they combine shipping.
MarkL:
And that probe is probably one of these, below. It has a 200 ohm series resistor inside ot it. The non-pointy end is 0.1" spacing. I have several of those too, but they don't fit anything I have.
I guess somewhere I must have inherited some of those 16515-68703 kits, or at least the contents of them. A lot of the time these things are just thrown in with other LA accessories when buying on ebay.
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