Talk:VAX 7000 and VAX 10000

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The descriptions of DEC Products are very helpful and give insight.

I wonder, though, how much can be said about a company-policy without expressing point of view, and, conversely, how much information can be left out without impairing the value of the article.

To explain: I wonder wether DEC corporation really had informed knowledgeable management which "intended swapping the CPU module(s)":

Digital intended customers of the VAX 7000/10000 to eventually upgrade to the Alpha-based configuration (DEC 7000/10000 AXP) by simply swapping the VAX-based CPU module(s) for those based on the Alpha.

It is probably a topic beyond interest for most Wikipedians except if we accept expressions (or explanations) like "version-hell".

I have thought of a few other descriptive categories for computer system failures, but I am definitely not an expert in English computer language:

  • Normal or expectable inconsistencies
  • Compiler dialects
  • Undefined behaviour

I mention these examples because I came to think of them in relation to the "intended CPU swapping". --d-axel (talk) 00:25, 3 February 2009 (UTC)[reply]

Did DEC intend customers of the VAX 7000 to upgrade to the DEC 7000 AXP and was this widely known? The answer is yes. This is supported by multiple sources - papers in the Digital Technical Journal, product documentation, DEC marketing material and the news: [1].
Regarding software issues as a result of upgrading from VAX to Alpha, there were two "solutions". The GEM compiler supported multiple programming languages, operating systems and hardware platforms and the VEST binary translator translated OpenVMS VAX binary images to OpenVMS AXP (Alpha) binary images. These are described in two papers, "The GEM Optimizing Compiler System" and "Binary Translation" in the Digital Technical Journal, Volume 4, Number 4.
Perhaps the article should elaborate further on the VAX to Alpha transition? Rilak (talk) 05:37, 4 February 2009 (UTC)[reply]

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Max memory incorrect[edit]

The page states that the maximum memory of these systems were 3.5 Gig, and this was because of an architecture limitation, as the VAX only have 32 bit addressing. This is incorrect. The virtual address space of the VAX is 32 bits. The physical address space depends on the implementation, and there have been many implementations of the VAX. The NVAX CPU, which were used in the 7000/10000 models can actually use 34 bits for the physical address. Although I do not know if the other subsystems of the 7000/10000 would allow 34 bit physical addresses. But it seems likely, as the Alpha used the same parts. For the 34-bit physical addressing of the NVAX, look at the VAX Archtecture Reference Manual, which is available online from bitsavers, for example. /bqt@update.uu.se 83.209.192.100 (talk) 14:48, 10 August 2015 (UTC)[reply]

I was just wondering about this, albeit 5½ years later. I just saw some documentation saying the 7000 supported up to 14 GB if only one CPU module was present, though the system was described as a "DEC 7000" so it was unclear whether it mean Vax, Alpha or both. But it's a reasonable question as DEC has plenty of history of hardware support for more memory than fits into the virtual address space (e.g. many of the PDP-11s).
3.5 GB seems oddly specific, though, especially as the reasoning given is "32 bits" which would be 4 GB. At first I'd just put it down to the tedious and endlessly confusing units war but it's not that, so what happened to the missing ½ GB? I'm assuming that part of the virtual address space is reserved for something or other but I have no idea and ideally it would be nice if the article might clarify both issues. Someone must know, but I am not that person!
--Vometia (talk) 15:34, 27 March 2021 (UTC)[reply]
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