Some of the content of this article would appear to be copied. Prominently
In many ways the VMEbus is the pins of the 68000 run out onto a backplane. In most cases this is a bad design, because it limits you to systems similar to the chipset the bus was originally designed for. However, one of the key features of the 68000 was a flat 32-bit memory model, free of memory segmentation and other "anti-features". The result is that, while VME is very 68000-like, the 68000 is generic enough to make this not an issue in most cases.
Could be just me, but I have no idea what an ADC or a scaler is in this context. If I were forced to guess, it would be "analog-to-digital converter" and perhaps a "video scaler", and I don't even know how much better my life would be for having this knowledge either way, but it's just a couple of things an editor with expertise might want to consider linking appropriately if they have the chance.--NapoliRoma (talk) 21:00, 18 December 2007 (UTC)
- I agree that this isn't clear to most users. The "ADC" is definitely referring to "analog-to-digital converter". A scaler is a device which increments a counter every time it gets a pulse (such as http://www.caen.it/csite/CaenProd.jsp?idmod=24&parent=11). They are very common in nuclear and particle physics experiments, but it seems that there isn't a page for it. Samnotwil (talk) 14:47, 17 February 2015 (UTC)
The picture does not show a valid configuration. I know some ofthe modules in that backplane. The VME spec requires the left most module to be a bus arbiter and in the photo shown it isn't...unless this 'minicrate' has slot 1 on the right (some minicrates are like that as they are built to be mounted with the bus oriented vertically with the topmost module slot 1.
ADC - Analog to Digital Converter Scaler - Counter.
The 'red' modules are nuclear instrumentation modules from CAEN (http://www.caen.it). The leftmost module is a CAEN V785 peak sensing adc, the second from the left a CAEN V830 latching scaler. I don't know what the CPU module is
The V785 locates the voltage peak of a signal during a gate pulse and digitizes the height of that peak.
The V830 has 32 counters which can be externally, internally or periodically latched for readout. The latch transfers the values of the counters to stable registers, and a multi-event memory allowing the counters to continue to increment.
Actual use today
As I read this blog post about linux WME drivers being integrated, I wondered what it was. I then read
It was first developed in 1981 and continues to see widespread use today.
-------------> Shows Bias! <----------------
The author is showing strong prejudice against VMEbus with statements such as "this is a bad design" and "anti-features". Certainly VMEbus is dated and has its limitations, but it is used widely with great success. I've seen it implimented in high reliabilty applications, high speed applications and military applications. We shouldn't write technical descriptions with such bias. As a reader, I just want to know how it works! BTW - If you travel, many of the aircraft use flight control computers using VME. --Mach77 (talk) 18:22, 14 August 2009 (UTC)
Section Ordering and Dependencies
The description section is written assuming that you have read the history section (e.g. not linking or describing the 68000). Many readers may want to read the description without any interest in the history. The Description section should either be the first section or should be independent of the history section. 184.108.40.206 (talk) 11:43, 28 August 2009 (UTC)