Dave

I managed to find your SMD version.



Only one issue is the hole locations -? other than that I think i will try your design on the 3852A. Will try up to 8 chips. I dont thin you can use more than 4MB in the 3852A
Maciej

On 5/3/24 13:11, Maciej Kawalkowski, Liberty Electronics Design and Service LLC wrote:

The Hp 9000 DIO board has the same pin out where it matters and looks like the same board type.

Yes, it does look to be the same thing.

I too have a 3852A by the way. It has never given me trouble, so I've never needed to open it up.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

On 5/3/24 12:59, Maciej Kawalkowski, Liberty Electronics Design and Service LLC wrote:

HP-9000 DIO RAM
Your post helped a lot . I think I found the cloned memory info by Dr. Scott M. Baker :
<>

That's not the project I worked on; the one I was involved in is just pure RAM, 7.5MB to fill the address space. No ROM. There was no discrete logic; everything was implemented in a GAL, and it was all surface-mount.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

On Fri, May 3, 2024 at 05:38 AM, Scott Townley wrote:

Ozan,
Thank you for the tips.? My observations:
1. I was able to verify +15VF, +5A and +10UF voltages directly on A7.? I need to get an extender to really dig into it :-(
2. In the system diagnostics, +10V Reference (presumably +10UF?) is quite unstable
3. In verifying +10UF, I measured at one end of R105, which connects +10UF to V(REF)+ of the DAC in the third converter ref_cal circuit.? Not knowing which end was which, it was easy enough to find the +10UF (and checking with an o-scope it's quite stable, unlike the system diagnostic), but as it happens the other side of R105 has a very small voltage on it (less than 100 mV).? This doesn't seem right to me.??
As I await my extender, any further insights would be appreciated!

===
Hi Scott,
Other end of R105 goes to a virtual ground inside the IC , seeing ~0V is expected. Current through R105 becomes the reference current for the DAC.

+10V test voltage should go through muxes mentioned in the previous message and show up as 1V at top of R18 (ANA_TEST). If you see 1V then this board is fine, the issue is either connectivity between this board and the CPU board or the MUX on the CPU board is damaged.?

Instead of extenders I usually solder kynar wires to critical test points and take out for measurement. At the measurement end I put different number of knots to distinguish which wire is which. A battery powered soldering iron works well for these small soldering jobs.?
Ozan

Hi,

I was also looking into these boards to add the 3rd channel and I found
out that all boards on eBay that have more than 3GHz you need to set the
SCALE to 4 otherwise it will not count correctly.

Below are the links for 12GHz and even 18GHz version:

18GHz Model:


12GHz Model:


Regards,
Razvan

Tony:

The 53131A had three options for the channel 3 input, 3GHz, 5GHz, and 12GHz.

I have never seen anything on EBAY over 3GHz installed in a unit.

I have seen Chinese Channel 3 boards for 3GHz (a lot of them) and 6GHz (just 1) currently listed.
I do not see the 12GHz board listed at this time, although it was listed in the past.

I did a board a few years back using the HMC432 (divide by 2) and two HMC434 (divide by 8) that could get to 6GHz or higher.

A less expensive version would use the HMC432 driving an MC12079 programmed to divide by 64, have the layout for it but never made it.

Never did any follow up on these because the Chinese clone boards were so inexpensive it was not worth pursuing.

ed

Dave
The Hp 9000 DIO board has the same pin out where it matters and looks like the same board type.

Jared:

I was looking at the 53131A specs and the minimum input spec for 100MHz to 2.7GHz is -27dBm and from there to 3Ghz is -21dBm.
I guess actual levels would be less than that , but not significantly or Agilent would have taken credit for it.

For the channel A and B inputs the levels range from 20mV to 40mV (-21dBm to -15dBm if terminated in 50 ohms).

Your board must have a lot of gain at the low end for the minimum input to be below -50dBm for frequencies below 800Mhz as seen in the PNG image you posted.

Like you, I also noticed that the input protection diodes affected the signal levels. More effect than I expected.?

I am currently using two Mini Circuits ERA amplifiers for the gain stage with a 3dB attenuator in line with the input.

My minimum input levels from 750MHz to 3GHz are somewhat in line with the Agilent spec, -34dBm to -21dBm.
At 500Mhz, the input level drops to -13dBm, I think my input cap and those in line may be too small.

ed

On Fri, May 3, 2024 at 10:01 AM, Dave McGuire wrote:

HP-9000 DIO RAM

Dave

Your post helped a lot . I think I found the cloned memory info by Dr. Scott M. Baker :


Maciej

Ed

The connector is part of the machine and the memory card uses PCB edge as connector.
There is a raiser inserted in onto the 3852A processor board like the one below.
The memory card interfaces this raiser.
I was thinking of making a card using? SRAM .? The 4Mbit chips? R1LP0408DSP-5SI (512kx8) would be a good choice.? 2 chips for 1MB card.
Some things I am not sure of are:

• how the? addressing works on these systems
• how the detection of RAM is determined? by the CPU
• how DTACK signal is generated
• what address range should be used (HP had dip switched)
• how address decoding would be done with dip switches for picking range

Maciej

If the CRT has an intact heater & shiny silver getter, it is probably fine. Lack of EHT is more likely to be a problem, especially if there are leaky paper based capacitors in the EHT circuit, or a bad step up transformer.
Also there are several 5AQP type CRTs on ebay, two which look to have been pulled from old oscilloscopes and one very expensive NOS.

David

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One more generic question: up to now I have never seen any evidence that the CRT is working, if I get to the point of having the whole circutry working again and I discover that the CRT is not recoverable will I be able to find a replacement? I already checked the heater and that one seems to have the right resistance, the look of the gettered surface seems to have the right look too. Thank you for your comments.

The first thing you should try is to reseat the power supply module in the main power supply. This module is similar to a memory module in an old PC, and it plugs into a DIMM socket.

I have a blank display on my HP8563E. The CRT is fine but I found out that -15 VDC power supply is down (LED on A2 is off). I measured nearly 0 V on TP303 (vs TP301) on A6.
Anyone came across the same problem?

Best regards, Michel F6DZK

On 5/3/24 07:20, Ed (scskits) wrote:

If the connector is still available, it would not be difficult to make a 1MB or 8MB static RAM board.
I did one not too long ago for the Data I/O UNISITE that also uses the MC68000.
The original UNISITE board was DRAM with up to eight 9 bit modules.
With the static RAM, the parity was disabled.

Nice!

If that is in fact an HP-9000 DIO RAM board, they've already been cloned. A fellow over in .eu did the design, I had a small run of PCBs done and built a few, and eventually got it working. I had intended to do a production run and sell them, but there wasn't a lot of interest on the vinthpcom list, surprisingly, so there it has sat for the past few years.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

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