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#vax

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Pubblico
Stephen Hoffman

One of the lesser-known units of time measurement is the microfortnight.

The microfortnight unit exists in VAX/VMS because the console hardware clock interrupts used in the VAX-11/730 console measure elapsed time in a unitthat differs from a second. This hardware interrupt frequency choice affects timeouts related to console operations.

(Note: Once VAX/VMS is booted, things related to timekeeping and timers all work as expected, and seconds are a second in length. But when running the console program, not so much.)

This also led to the creation of the SD730 Fixed Head Solar Horologue option; a sundial intended to assist with tinekeeping.

slashdot.org/comments.pl?sid=7

#digitalequipment#vax#vax11
Pubblico
Mark Gardner

Did I just do a #Markdown conversion of Mark Russinovich’s seminal 1998 article on #WindowsNT (and by extension, all modern versions of #MicrosoftWindows)’ debt to #DEC’s #VMS #OperatingSystem? Just so I could have a decent copy apart from the dusty carried-over archived version at ITProToday.com/server-virtuali ?

Why yes, yes I did. Why not?

screenshot of DEVONthink editing a Markdown document
#Windows#RetroComputing#VAX
Pubblico
emeritrix

Folks, if you or you kids can get ANY vaccines or boosters that they will need, get them NOW. I think they will first target HPV, so definitely make sure your kids get that. They can give the first dose at 9. And you are eligible until you are 45. Also, if you are Gen X and might only have had one dose of measles vaccine (was the standard for a while) or if you might have missed the MMR at any point, GO GET ONE TODAY. You CAN ask your doctor to titer you, which is fine, but if you don't have time or medical insurance, you can also just go get the vaccine.

#Vax

apnews.com/article/childhood-v

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Pubblico
Stephen Hoffman

@jfmezei One of the reasons VAX is comparatively slow involves the condition codes, including the carry bit.

~Every VAX instruction is a test instruction, if you want it to be.

But if you break that part of the VAX design to make the architecture go faster, you might as well also break, err, alter some other VAX architectural design constraints. After some other work including Prism, that architectural replacement was Alpha.

As assemblers go, VAX is quite nice.

But assembler as a choice for app development started to fade around the era of the 3GL vs Assembler debates; the early to mid 1980s.

Section 8.4 has details of the VAX condition codes:

docs.vmssoftware.com/docs/vsi-

#vax#hardwarearchitecture#retrocomputing
Pubblico
The Mainframe

More from my tech gijinka prompt list, and the last lol.

I lost motivation rather quickly on my *own* prompt list I created so this was the last character I ever did. This is Valencia Marisela McGovern-Tiburón as seen in Chapter 7 of I Was a Software Developer by @synergy as part of her Operating Superstars project, which is a take on the concept of personifying computers and operating systems.

Valencia represents the VMS/VAX

#OStan#Gijinkas#Personification
Pubblico
Bitslingers-R-Us
I posted yesterday about how NetBSD/m68k compile itself from scratch on real m68k hardware. m68k is a clean architecture with good gcc support and even llvm support, so it shouldn't come as a surprise that this works, even if it does take two months on a decently fast m68040.

But what about #VAX?
Pictured is a VAXstation 4000/60 on a table with a red cloth tablecloth. On top of the VAXstation is a VT420 terminal which shows HALT being set on the VAX, then the NetBSD boot blocks loading. The VT420's keyboard is in front of the VAX.
Pubblico
Stephen Hoffman

There is a DEC NIC (the DEBNA and DEBNK) with both an on-board VAX chip, and an 80186 chip.

Expensive chip choices aside, this NIC could continue to run with the VAX host entirely shut down, if the VAXBI host bus was not specifically reset.

Which meant you could successfully ping a downed host, as the VAX and 80186 and firmware running out on the NIC could conspire to process that traffic autonomously.

Fun times.

bitsavers.informatik.uni-stutt

#retrocomputing#dec#vax
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