Category Archives: DEC Alpha

Hiding in plain sight: The 64bit Dec Alpha C compiler

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Of all the Microsoft Windows NT versions, the few of the rare ones include:

  • The i860 version, the original N-Ten that put the NT in NT.
  • The DEC 5000/MIPS version
  • The Clipper version
  • The SPARC/LE version
  • The HP9000/HPPA version
  • The AXP64/ALPHA64 port, the first 64bit version of 2000

Sadly, I don’t have any leads on any of the above. But while I was looking for the first public Win64 compiler that I could remember, it was just the frontend to the Itanium compiler, not letting you actually compile anything. Anyways I was able to find these two downloads:

And both of them have the same Win64 SDK, which includes this quick note in the readme:

Platform SDK support for Win64(tm)

This release of the Platform SDK will allow you to test-compile your
code for Win64. It supports the new 64-bit data types and pre-beta
releases of an IA64 compiler and an ALPHA64 compiler and linker.

1999 Platform SDK

It’s the same thing on both discs from what I remember.

Installing the SDK is certainly a product of it’s time, with a seemingly incredible amount of products to support.

I haven’t tested yet, but I have to wonder how integrated all the tools are into Visual C++. Stay tuned?!

Also there was still POSIX support. Windows 2000 was the last to support all the subsystems.

And of course, the star of the attraction, the 64 bit Test Compiler. There is an incredible amount of products and options to select, It must have been absolute chaos at Microsoft in the late 90s!

If you are on an intel based system, the 64bit compiler will be the top half of the Itanium compiler. It lacks the C2.DLL so it will not emit any assembly or object files. There is no linker libraries either, so for all intents and purposes it’s useless.

However, if you were to install this super preliminary SDK on a Dec Alpha you would instead discover a version 13 build of Microsoft C/C++

Microsoft (R) & Digital (TM) Alpha C/C++ Optimizing Compiler Version 13.00.8499
Copyright (C) Microsoft Corp 1984-1999.
Copyright (C) Digital Equipment Corporation 1992-1999.
Copyright (C) Compaq Computer Corporation 1998-1999.
All rights reserved.

The Visual C++ 6.0 on the Dec Alpha however is a version 12 compiler. So this is a big surprise for AlphaNT users!

And added to version 13 are these flags:

  /Ap32 enable P32 model
  /Ap64 enable P64 model (default)

That’s right! It turns out that the AXP64 compiler set has been hiding in plain sight for DECADES. I know that it’s so unlikely that we’d ever see any public release of a 64bit version of Windows for the Alpha, but oddly enough the compiler, headers and libraries are all there. YES You can make full EXE’s for AXP64/Alpha64. Of course with no OS, so it’s not like you can run them.

The compilers have been tested on NT 4.0 Terminal Server & 2000 RC2.

For anyone wondering here is how I ran it to compile then link a 64bit exe:

C:\proj>cl /c /Ap64 mt.c /Fomt64.obj
Microsoft (R) & Digital (TM) Alpha C/C++ Optimizing Compiler Version 13.00.8499
Copyright (C) Microsoft Corp 1984-1999.
Copyright (C) Digital Equipment Corporation 1992-1999.
Copyright (C) Compaq Computer Corporation 1998-1999.
All rights reserved.

mt.c

C:\proj>link mt64.obj /MACHINE:ALPHA64
Microsoft (R) Incremental Linker Version 6.20.8528
Copyright (C) Microsoft Corp 1992-1999. All rights reserved

There is no point sharing the EXE as I mentioned above, there is nothing to run it on. But for the heck of it, here is uuencode compiled into assembly in both 32bit & 64bit mode.

uuencode-axp_asmDownload

I can’t imagine why, but for people who want to take them apart you can download the tools here.

Sadly as of today, there is no way to test. There is one surviving machine with Windows 2003 AXP64, outlined in an article by Raymond Chen. Its a great read about how Alpha64 NT port came to be. The machine is still sitting in Microsoft Archives. Hopefully one day someone can dig it out.

That said there is also version 13 compilers for both Itanium & AMD64. Although we can do stuff with the AMD64 port which I will try to write into something a bit more.. sane.

I found this a few weeks ago, and thanks to @tenox for giving me Alpha access to play a little with this hidden gem. It’s still crazy we’ve all had Alpha64 tool access the entire time.

When 0 is greater than 1.0

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I came across this fun thing debugging a QuakeWorld client on a RISC machine. I think something is failing as I’m using terminal server. For some reason width is being passed as 0. Not sure why I didn’t debug it enough to care, so I setup a quick block to only evaluate the Fov if the calculated x was greater than 1.0

And Microsoft C did not disappoint.

I think it may have been some incremental linking issue? I’m not sure I purged the build directory and re-ran make and didn’t experience the crash again. I had to get the screenshot or even I wouldn’t believe it.

In the end I got it running:

Of course among the eagle eyed you may notice this is version 13.00.8499 of the compiler. But the last compiler for the Dec Alpha / Windows NT was version 12…

More on that later!

Ready to run OpenVMS VM – Student Kit from VSI

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(This is a guest post by Antoni Sawicki aka Tenox)

I was recently registering a new OpenVMS Community License. In the process I learned that there is a ready to run, pre-installed and pre-configured VM with OpenVMS 8.4. Completely free for non-commercial purposes. You don’t even need to register or leave your details (WOW). Just download and run! Thank you VSI!

https://training.vmssoftware.com/student-license/

The student kit runs only on Windows as contains FreeAXP emulator. However it’s super easy to download, install and run.

VSI OpenVMS Student Kit

I’m hoping that in near future once x86 OpenVMS port is ready there will be images for x64 hypervisors like VMware, VirtualBox, Hyper-v and QEMU/KVM hopefully.

Installing Debian Linux 5.0 on the Qemu Dec Alpha

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Years ago I’d written this terribly vague, and generic quickie post that Debian 5 will in fact boot inside of Qemu. I didn’t really want to get into it as it’s a little complicated and a lot painful. People have cried out over the years, but I figured I’d help people.

Linux for the Dec Alpha

For operating system tourists, I’ll save you the story, just go here, and download qemu-2.2.50-DecAlphaDebian.7z. You’ll quickly find out it’s borderline useless, and go onto your next thing. You’re welcome.

First thing this was running in 2014, and newer Qemu’s seem to behave… strange. So I stuck with a late 2014 build of Qemu. If you deviate from here , you are on your own. I did dig up quite a few other Dec Alpha AXP emulators and put them on archive.org. -But that’s totally up to you, again I’m sticking with 2014’s Qemu.

The BIOS/Pal on Qemu’s Alpha is far from complete and cannot read disks, so no boot sectors, boot loaders, no on disk kernels. All is not lost, you can inject a kernel and initrd, however this is where the fun is. Obviously to install you need to extract both from the ISO file. Also make sure the kernel is decompressed, add a .gz extension and de-compress it, as it should be around 6MB.

qemu-system-alpha.exe -net nic -net user -drive file=alpha.vmdk,if=ide,media=disk -drive file=debian-5010-alpha-netinst.iso,if=ide,media=cdrom -initrd initrd.gz -kernel vmlinux

This is vaguely how to boot up the installer. Partition, make sure hda1 hda2 hda3 etc are created and all is fine.

Now the next amount of fun is that you need to extract the created initrd as the installer initrd always launches the installer. The busybox cannot create tar files, there is no ftp or scp, also I couldn’t get it to even try to mount NFS images.

However on Windows 10 with WSLv2 or a Linux machine you can mount the disk image (keep it raw? or convert it?)

losetup /dev/loop0 myimage.disk 
partprobe /dev/loop0
mount /dev/loop0p1 /mnt/myimage

These three steps will let you mount the disk in this case /dev/loop0p2 which is the root filesystem. Debian didn’t have partprobe installed so I had to apt-get install parted

Now that you can mount it, you can copy the boot/initrd.img-2.6.26-2-alpha-generic file.

We do need to tell Linux where the root filesystem is so to finally run Qemu it’s like this:

qemu-system-alpha.exe -net nic -net user -drive file=alpha.vmdk,if=ide,media=disk -initrd initrd.img-2.6.26-2-alpha-generic -kernel vmlinuz-2.6.26-2-alpha-generic -append "root=/dev/hda2"

Obviously this was a lot more time consuming than it should be, but now I can do useful things.

Also sometimes Qemu just sits there with a black screen. the UI is waiting for something ,not sure what. It’ll either come to life on it’s own or you got to bang it.

Multia under Thermal Camera

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(This is a guest post by Antoni Sawicki aka Tenox)

DEC Multias are known for notoriously overheating. Someone even coined a term “Multia Heat Death”. The typical folklore recommendation of the time was to only run it vertically and replace the built-in fan with a more powerful one.

In modern times one can inexpensively acquire a thermal camera that attaches to a mobile phone. So why not take a peak inside the inferno.

Multia with 166 MHz CPU Under FLIR

This is how Multia looks like in a thermal camera. PS is on top right. CPU on the left. FDD/HDD bottom left.

The CPU, Alpha AXP, runs at around 60C, not great, not terrible.

Scanning up close through individual chips I found this curiosity:

Wedged between the memory chips and the power supply is a little chip that generates almost 100C. That’s a boiling temperature of water. Note the thermal image is shifted in regards to the visual part due to close range.

What does this chip do? I have no clue. Perhaps someone can help here. What I however did to it is this:

Slapped on this really nice radiator. In fact I added little radiators you can buy for Raspberry PI to all the chips generating tons of heat.

This is how the motherboard looks like right now:

I also added a tiny fan on top of the CPU. Drilled some holes in the case and of course replaced the main fan with a highest air flow I could find.

Time will tell if this resolves the heat death, but my Multia now runs much cooler with help of all the radiators and extra fans.

UPDATE in 2022:

Readers frequently asked “what about the heat death chip?“. Multia indeed has one specific chip that is a source of most of Multia casualties. According to NetBSD Multia Page the chip is 74F623 and is located on the bottom (flip) side of the motherboard.

You can tell it’s little charred. I so I went to take a peek with a thermal camera:

Can you locate it? FLIR found it immediately… Up close the chip goes above 100C:

I have added a small heat sink to it and now looks a little better!

Time will tell if it helps or not.

GXemul for Win32

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Luna m88k booted off RAM disk

Don’t get all to excited, it’s a terrible port, but it’s to the point where it can barely run stuff. Although I don’t know how much is me, and how much is GXemul. I probably should have tested on Linux first.

Anyways it’s enough to boot the Luna m88k OpenBSD ram disk up to the single user mode, and poke around. The hard disk doesn’t pick up, and I haven’t even tried the NIC, although the address is looking pretty bogus.

I wanted to try the PMAX version of Mach, but then it hit me, that there is no server to load. And porting the system level from Mach 3.0 to 2.5 looks way more involved than Mach 3.0 being ‘something minor’.

Back on the 88k front, the Luna shipped with something called UniOS-Mach, but good luck finding that in this day & age. I guess I’ll have to go back to Japan.

For the crazy among us, go ahead and try gxemul-0.6.2-ultra-primative.zip The name says just how stable it is.

In the meantime here is a super low resolution capture of the screensaver from a Luna via http://www.nk-home.net/~aoyama/luna88k/

As an update, I added in the timer code from PCemu, and now that the timers appear to be firing some stuff like OS/F 1.0 get’s further!

OS/F 1.0 in single user mode

I need to go through the setup stuff a lot better as this is just untar’d and not setup at all. Not that it’s useful, but here, osf1-barely.7z .

So if anyone downloaded gxemul prior to this update, re-download it again! I put the m88k ramdisk kernel in there too so you can quickly test the Luna 88k emulation.

Confessions of a paranoid DEC Engineer: Robert Supnik talks about the great Dungeon heist!

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What an incredible adventure!

Apparently this was all recorded in 2017, and just now released.

It’s very long, but I would still highly recommend watching the full thing.

Bob goes into detail about the rise of the integrated circuit versions of the PDP-11 & VAX processors, the challenges of how Digital was spiraling out of control, and how he was the one that not only championed the Alpha, but had to make the difficult decisions that if the Alpha succeeded that many people were now out of a job, and many directions had to be closed off.

He goes into great detail how the Alpha was basically out maneuvered politically and how the PC business had not only dragged them down by management not embracing the Alpha but how trying to pull a quick one on Intel led to their demise.

Also of interest was his time in research witnessing the untapped possibilities of AltaVista, and how Compaq had bogged it down, and ceded the market to the upstart Google, the inability to launch a portable MP3 player (Although to be fair the iPod wasn’t first to market by a long shot, it was the best user experience by far).

What was also interesting was his last job, working at Unisys and getting them out of the legacy mainframe hardware business and into emulation on x86, along with the lesson that if you can run your engine in primary CPU cache it’s insanely fast (in GCC land -Os is better than -O9).

The most significant part towards the end of course is where he ‘rewinds’ his story to go into his interest in simulations, and of course how he started SIMH when he had some idle time in the early 90’s. SIMH of course has done an incredible amount of work to preserve computing history of many early computers. He also touches on working with the Warren’s TUHS to get Unix v0 up and running on a simulated PDP-7 and what would have been a challenge in the day using an obscure Burroughs disk & controller modified from the PDP-9.

Yes it’s 6 hours long! But really it’s great!

GCC for Windows NT / Dec Alpha?

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Somehow I never noticed this until making what seemed like a pointless GCC config.

You can apparently build a GCC like this:

sh configure –host=i386-winnt35 –target=alpha-winnt35

And you can get a cross compiler.

The real question is, does it work? ร‚ย I don’t know I don’t have a cross assembler, linker or a target machine.

 


D:\proj\gcc-3.0.4\gcc>xgcc -v
Using builtin specs.
Configured with: : (reconfigured) : (reconfigured) : (reconfigured)
Thread model: single
gcc version 3.0.4

D:\proj\gcc-3.0.4\gcc>xgcc -v -S hi.c
Using builtin specs.
Configured with: : (reconfigured) : (reconfigured) : (reconfigured)
Thread model: single
gcc version 3.0.4
cc1 -lang-c -v -iprefix ../lib/gcc-lib/alpha-winnt35/3.0.4/ -D__GNUC__=3 -D__GNUC_MINOR__=0 -D__GNUC_PATCHLEVEL__=4 -DWIN32 -D_WIN32 -DWINNT -D__STDC__=0 -DALMOST_STDC -D_M_ALPHA -D_ALPHA_ -D_LONGLONG -D__unaligned= -D__stdcall= -D__WIN32__ -D_WIN32 -D__WINNT__ -D__STDC__=0 -D__ALMOST_STDC__ -D_M_ALPHA -D_ALPHA_ -D_LONGLONG -D__unaligned= -D__stdcall= -D__WIN32 -D__WINNT -D__ALMOST_STDC -Asystem=winnt -D__NO_INLINE__ -D__STDC_HOSTED__=1 -D__LANGUAGE_C__ -D__LANGUAGE_C -DLANGUAGE_C -Acpu=alpha -Amachine=alpha -D__alpha -D__alpha__ -D__alpha_ev4__ -Acpu=ev4 hi.c -quiet -dumpbase hi.c -version -o hi.s
GNU CPP version 3.0.4 (cpplib)
GNU C version 3.0.4 (alpha-winnt35)
compiled by GNU C version 5.1.0.
ignoring nonexistent directory “../lib/gcc-lib/alpha-winnt35/3.0.4/include”
ignoring nonexistent directory “../lib/gcc-lib/alpha-winnt35/3.0.4/../../../../alpha-winnt35/sys-include”
ignoring nonexistent directory “../lib/gcc-lib/alpha-winnt35/3.0.4/../../../../alpha-winnt35/include”
ignoring nonexistent directory “NONE/include”
ignoring nonexistent directory “D:/pcem/building/MinGW/msys/1.0/local/lib/gcc-lib/alpha-winnt35/3.0.4/include”
ignoring nonexistent directory “D:/pcem/building/MinGW/msys/1.0/local/lib/gcc-lib/alpha-winnt35/3.0.4/../../../../alpha-winnt35/sys-include”
ignoring nonexistent directory “D:/pcem/building/MinGW/msys/1.0/local/lib/gcc-lib/alpha-winnt35/3.0.4/../../../../alpha-winnt35/include”
#include “…” search starts here:
End of search list.
: warning: “__STDC__” redefined
: warning: this is the location of the previous definition
: warning: “__STDC__” redefined
: warning: this is the location of the previous definition
hi.c: In function `main’:
hi.c:3: warning: return type of `main’ is not `int’

This is what the output looks like, which looks nothing like targeting the i386 so I guess so?


.set noreorder
.set volatile
.set noat
.globl __fltused
.file 1 "hi.c"
.rdata
.quad 0
$LC0:
.ascii "Hello from GCC %s\12\0"
$LC1:
.ascii "3.0.4\0"
.text
.align 2
.globl main
.ent main
main:
.frame $15,0,$26,0
.mask 0x4008000,0
lda $30,-16($30)
stq $26,0($30)
stq $15,8($30)
mov $30,$15
.prologue 0
jsr $26,__main
lda $1,$LC0
addl $1,$31,$2
lda $1,$LC1
addl $1,$31,$1
mov $2,$16
mov $1,$17
jsr $26,printf
mov $15,$30
ldq $26,0($30)
ldq $15,8($30)
lda $30,16($30)
ret $31,($26),1
.end main