Rohde Schwarz R&S UPL Audio Analyzer Renovation

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cskg

Member
Joined 2009
In the second-hand market, there are many half-length industrial ISASBC or PC104SBC, which can be used for UPL by making an adapter board. This is my idea. Those who use the VIA686 chip can basically use the native ISA. There is a wide range of CPUs available, from 586 _ PIII to suitable motherboards.
I have been using WIN98SE since 2021 and I am very satisfied. The motherboard is externally connected with USB and PS2 mouse sockets. The CPU is K6-2 + 450 running at 300MHZ. I hope the core voltage is 1.5V. Unfortunately, the AI5VG motherboard can only provide a minimum voltage of 2.0V.
So, I've been looking for a suitable way to use a lower power CPU and motherboard, but only if there is a native ISA, with PS2 mouse and USB .
 
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cskg

Member
Joined 2009
ZakMcKracken said:
Ok, now @Bjirre has Window 95 and 98 running on his machine, Pandora’s box has opened here. Until now, I had left it closed, because there was no point in opening it for a DOS machine.

Pandora’s box, here, contains vintage CPUs and RAM. Stuff that‘s not taking up space, hence not saving any by tossing it out. And for as long as I’m buying used x86 based Test & Measurement, I’m very cautious about what I throw away. So I’ve opened my UPL, and started to expand it.

The stock CPU is an IDT WinChip C6. Ironic, for a DOS machine. But what’s more remarkable, is that it’s clocked at 133MHz, instead of the 200MHz it is rated for. Perhaps this is done to reduce heat dissipation, or perhaps because all EMC tests were done at 133MHz and R&S didn’t want to go through that again for additional performance they didn’t need anyway. It does have a heatsink with fan installed, but no cooling paste was applied.

Did anybody here, especially the people running Windows, increase the clock frequency, or replace the CPU with a faster one? Pandora’s box here still contains an AMD K6-III+ rated for 380MHz. A 500MHz version exists, but is in high demand by vintage gamers.

Did anybody here increase the RAM? My machine has 32MiB in 2 72-pin SIMMs. I don’t know if that’s stock, or that I installed that. But I did find 3x 128MiB DIMMs in Pandora’s box. They are PC-133 memory, where PC-100 is required, but I don’t think that’s a problem. What is a problem, is the SuperCap on the R&S board right where the DIMMs are, and the heights of the DIMMs themselves.

Does anybody know what’s the largest harddisk size supported?

Having Windows running on this instrument VASTLY increases its usability, because it enables network access, eliminating the need for mucking around with floppies or floppy images. Thanks @Bjirre!
Click to expand...
SDRAM 128M !
If there is a digital board, there will be a conflict between the position of the memory module and the digital board. My solution is to choose the shortest memory module and polish off the ROM chip of the PCB a little more, so that it will not be affected.
 

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pac1085

Member
Joined 2012
Hi, I don’t have a UPL, I own a Levear VP-7725D, but I have an SML with the B5 option for tuners. I was hoping to take a look at the .BAS files R&S includes with the package here: https://www.rohde-schwarz.com/us/ap...h-option-b5-application-note_56280-15610.html

Is there any chance someone can open the BAS files in that package and save them in .TXT format with R&S Basic on their UPL? They do not open correctly on a PC in their current format, which seems to be known. I would like to try to get some clues from the files on how to adapt the code to work with my test equipment. Thanks!!
 
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