Products > Test Equipment
HP 5335A Timer / Counter - Anything i should know?
Dr. Frank:
--- Quote from: max_torque on May 27, 2014, 12:39:54 pm ---This is turning into quite an interesting thread! ;-)
Yes, my unit is V1.1 and displays decimal point on boot. I'll try and upload the proms when i get a second :-+
I think i will install the fan mod too. Mine is running from the DC bus, but boy is it noisy! It's like someone doing the hoovering in the room :-//
Also, i notice the GPIB board "A7" is completely seperate from the logic board "A4" and consists of a GPIB driver, driven by some parallel data lines for address and data etc. A nice little project would be to replace this pcb with a modern microcontroller with a direct USB output, to a USB socket on the front panel (probably on the right hand side) That would neatly avoid all the messing around with GPIB->USB convertors etc!
If i find the time i might scope out some of the signals, however, assuming the driver IC on A7 is "dumb" then we should have TTL level GPIB protocol on the A7xA4 connector????
--- End quote ---
Hope your Eprommer can handle those strange EPROMs, they have another pinning than the 2764s.
So I can't read mine..
A7U1 is not a dumb GPIB driver, it's the 68488 GPIB controller, so I assume it contains also several timer, registers and perhaps a small state machine.
Edit: Yes, it's confirmed. datasheet still is online, and the chip contains a lot more of intelligence. Especially all those GPIB handshake signals and registers, DMA controller, and GPIB-488 command parser are covered.
Frank
max_torque:
No, my EEPROMMER isn't "Old skool" enough to deal with the MCM68764 chip! I'll have to knock up something with a micro to read them............
Ok, so if the GPIB board does have it's own intelligence driver, that means the interface between it and the main processor on A4 is even more likely to be fairly simple?
Dr. Frank:
--- Quote from: max_torque on May 27, 2014, 01:20:56 pm ---
Ok, so if the GPIB board does have it's own intelligence driver, that means the interface between it and the main processor on A4 is even more likely to be fairly simple?
--- End quote ---
Well, the interface maybe simple, but the traffic on it is quite complicated as the 6802 µP has to program all that stuff inside the GPIB controller.
I see no chance to simply interface at that point, either.
Frank
Wim13:
My 5335, serialnumber starts with 2032A, and has two NMOS roms type 2364
And also my advance (e)prom programmer has no option for these.
If you want, you have to make a conversion tool, it does not differ very much from a 2764,
so it is not difficult to make because you have only to read the 2364
I did that before to convert from some old TMS 2564 to 2764
I found with google some already designed conversion tools.
2364 Pinout compared to 2764
2764
+----\/----+
2364 Vpp Vcc
+- --\/----+ A12 P
A7 | 1 24| Vcc A7 nc
A6 | 2 23| A8 A6 A8
A5 | 3 22| A9 A5 A9
A4 | 4 21| A12 A4 A11
A3 | 5 20| /CS A3 /OE
A2 | 6 19| A10 A2 A10
A1 | 7 18| A11 A1 /CE
A0 | 8 17| D7 A0 D7
D0 | 9 16| D6 D0 D6
D1 |10 15| D5 D1 D5
D2 |11 14| D4 D2 D4
Vss |12 13| D3 Vss D3
+----------+ +----------+
Zucca:
Very happy to find such a post here.
Yes I´m on board too, I made yesterday a jump in the dark by buying this puppy:
http://www.ebay.com/itm/HP-5335A-Frequency-Counter-/181420545057?nma=true&si=q%252B7%252BHm8nU5AXQNl3C3Cf3Ut7vl4%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
Seller had 0% review in ebay.... :-\ When I will open this up I am worried to find dead animals inside. My be it was used by EE terrorists in the past. Keep you posted.
Can´t wait to tune it up...
Sorry for the slightly out of topic question... but which EEPROM reader to you suggest? I am missing such a device on my bench.
PS: I got water in my mouth for a rubudium 10MHz bomb now.
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