19 Apr
2001
19 Apr
'01
12:33 p.m.
Hi;
I need some help IDing some DEC cards;
What is a PMAG-E & a PMAD A used on? How can I identify the quantity of VRAM
on the PMAG-E? What is the small memory card on the same? All the slots are
full.
How big is a RF35-EA drive? RZ25, RZ26 & RZ28?
How much memory on a M7622-AV, a M7622-AP and a DataRam 63015 (180010002)?
These are in the VAX 4000/200. How do you open the case on the 4000 to see if
it has any drives? I got the front panel open.
Is an Emulex QD2110202 a Qbus ESDI or MFM drive controller?
What is a Microtech MT CIQBA+?
How much ram does a M7608 BS have
What is an AH-132-06? 6 wide card, prob. Unibus. One is marked CPU Nissho.
What is DEC MS02-AA memory used on and what size are they?
Thanks for all help.
If anyone is interested in purchasing any of this please contact me offline
at whoagiii(a)aol.com. I will ship overseas.
Paxton
Portland, OR
PS Also available is an MT external case with an Exabyte 8200 tape in it, a
couple SZ 12X (an LA & an EA) Drive cases for 3100s, a Todd SCSI 1 CD tower
with 4 Hitachi CDs (came in with the DEC) and a storage works drive tower
with no sleds or drives.
19 Apr
19 Apr
2:24 p.m.
I need some help IDing some DEC cards;
What is a PMAG-E & a PMAD A used on? How can I identify the quantity of VRAM
on the PMAG-E? What is the small memory card on the same? All the slots are
full.
They're Turbochannel cards, so I think they can be used in VAXstation 4000's
(except the VLC), DECstations, and DEC 3000's.
How big is a RF35-EA drive? RZ25, RZ26 & RZ28?
RZ25 ~500MB
RZ26 ~1GB
RZ28 ~2GB
How much memory on a M7622-AV, a M7622-AP and a
DataRam 63015 (180010002)?
These are in the VAX 4000/200. How do you open the case on the 4000 to see if
it has any drives? I got the front panel open.
M7622-AV I think 8MB for MicroVAX III
M7622-AP Ditto
DataRam 63015 Based on the 630 I'm wondering if this isn't for a MV II.
Is an Emulex QD2110202 a Qbus ESDI or MFM drive controller?
QD21 ESDI for PDP-11 or VAX
What is a Microtech MT CIQBA+?
Sounds very cool, it's a MTI CI Q-Bus Adapter
How much ram does a M7608 BS have
4-Mbyte RAM for KA630 (MicroVAX II)
What is an AH-132-06? 6 wide card, prob. Unibus. One
is marked CPU Nissho.
No idea.
What is DEC MS02-AA memory used on and what size are
they?
IIRC, they go in DECstation 3100's and are something like 2MB.
PS Also available is an MT external case with an
Exabyte 8200 tape in it, a
couple SZ 12X (an LA & an EA) Drive cases for 3100s, a Todd SCSI 1 CD tower
with 4 Hitachi CDs (came in with the DEC) and a storage works drive tower
with no sleds or drives.
What model is the StorageWorks tower? BA350 or BA356?
Zane
3 p.m.
DataRam 63015 Based on the 630 I'm wondering if
this isn't for a MV II.
I inquired some time ago about a DataRam board I have (DR224
8MB memory upgrade, for the Digital MicroVAX and MicroVAX II) and was
given the following contact at Lindtronics for info and support of
these older products, provided by DataRam:
Gary Lindholm
715-268-9278
Jeff
--
Collector of Classic Microcomputers and Video Game Systems:
Home of the TRS-80 Model 2000 FAQ File
http://www.geocities.com/siliconvalley/lakes/6757
20 Apr
20 Apr
10:37 a.m.
New subject: RFO: HP 85/Rocky Mountain BASIC replacement
Hello -
My HP 85 is growing long in the tooth. I want to replace it with
something more modern BUT just as reliable/dependable (e.g. doesn't
crash). I'm afraid when it does break I won't be able to find parts to
repair it. It's being used in a working research lab. I use it to
control a rack of electronic gear (e.g. frequency synthesizer, dynamic
signal analyzer, network analyzer, etc.) so I don't need anything fancy
just bullet proof and reliable. This means windows and macs are out.
What's your opinion.
john
--
************************************************************************
* * *
* John Ott * Email: jott(a)hamming.ee.nd.edu *
* Dept. Electrical Engineering * *
* 275 Fitzpatrick Hall * *
* University of Notre Dame * Phone: (219) 631-7752 *
* Notre Dame, IN 46556 USA * Fax: (219) 631-9924 *
* * *
************************************************************************
11:22 a.m.
New subject: RFO: HP 85/Rocky Mountain BASIC replacement
You might want to investigate BeOS for this.
www.be.com or www.gobe.com for the pro version. Pro version on a CD is
$60, comes with all the development goodies - GNU C++, API docs, etc.
I use it as my day to day desktop. It's rock solid.
Hello -
My HP 85 is growing long in the tooth. I want to replace it with
something more modern BUT just as reliable/dependable (e.g. doesn't
crash). I'm afraid when it does break I won't be able to find parts to
repair it. It's being used in a working research lab. I use it to
control a rack of electronic gear (e.g. frequency synthesizer, dynamic
signal analyzer, network analyzer, etc.) so I don't need anything fancy
just bullet proof and reliable. This means windows and macs are out.
What's your opinion.
john
--
************************************************************************
* * *
* John Ott * Email: jott(a)hamming.ee.nd.edu *
* Dept. Electrical Engineering * *
* 275 Fitzpatrick Hall * *
* University of Notre Dame * Phone: (219) 631-7752 *
* Notre Dame, IN 46556 USA * Fax: (219) 631-9924 *
* * *
************************************************************************
--
Jim Strickland
jim(a)DIESPAMMERSCUMcalico.litterbox.com
-----------------------------------------------------------------------
BeOS Powered!
-----------------------------------------------------------------------
1:10 p.m.
New subject: RFO: HP 85/Rocky Mountain BASIC replacement
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2:58 p.m.
New subject: RFO: HP 85/Rocky Mountain BASIC replacement
John,
First, I'm wouldn't worry about the reliability of a HP-85. They seem to
run forever and I expect there will be plenty of them that will out live
me! Surplus HP-85 are plentiful and relatively cheap. I'm grab several for
spares, find a supply of printer belts and learn how to repair the tape
drives (or better yet, get a compatible disk drive and transfer everything
to disk). Then you should be set to run forever.
Second, IF I was really determined to replace the HP-85, I would replace
it with another HP such as a HP 9000 series 200. A 9826 or 9836 would be an
excellant choice. I would not use a non-HP machine. It would be a major job
to translate HP BASIC to something that would run on another machine. For
one thing, HPs use BCD arithmetic instead of binary so they'll much more
accurate than most other machines unless they use special software. In
addition, HP BASIC has lots of control statements that simply aren't
available on most other machines. Then too you would have to consider how
to make and operate interfaces that are capable of doing what the HP
interfaces do. If I did go to a 9826 or 9836, I would stock up on spare
machines, disk drives and whatever else I needed. These are also relatively
plentiiful and cheap (FOR THE TIME BEING!)
Joe
At 02:37 PM 4/20/01 -0500, you wrote:
Hello -
My HP 85 is growing long in the tooth. I want to replace it with
something more modern BUT just as reliable/dependable (e.g. doesn't
crash). I'm afraid when it does break I won't be able to find parts to
repair it. It's being used in a working research lab. I use it to
control a rack of electronic gear (e.g. frequency synthesizer, dynamic
signal analyzer, network analyzer, etc.) so I don't need anything fancy
just bullet proof and reliable. This means windows and macs are out.
What's your opinion.
john
--
************************************************************************
* * *
* John Ott * Email: jott(a)hamming.ee.nd.edu *
* Dept. Electrical Engineering * *
* 275 Fitzpatrick Hall * *
* University of Notre Dame * Phone: (219) 631-7752 *
* Notre Dame, IN 46556 USA * Fax: (219) 631-9924 *
* * *
************************************************************************
7:03 p.m.
New subject: BCD accuracy (was: HP 85/Rocky Mountain BASIC replacement)
At 06:58 PM 4/20/01 -0500, Joe Rigdon wrote:
...For
one thing, HPs use BCD arithmetic instead of binary so they'll much more
accurate than most other machines unless they use special software.
...
I've heard this claim many times that BCD is more accurate. I'm I just not
understanding something?
Unless you are doing financial work where the fractional numbers tend to be
inherently decimal, BCD arithmetic, for a given number of bytes of storage,
is less accurate than binary. As a BCD byte can represent only 100 states
vs 256 for binary, you are going to lose more than one bit of accuracy per
byte of storage. Over a typical 13 nibble mantissa, it comes to more than
8b wasted. Actually, it is worse than that, for a couple reason having
to do with normalization of the numbers. Firstly, a binary representation
can scale the mantissa to retain every bit possible, whereas a BCD
representation has a 4b granularity on the shifting, so it probably wastes
two more bits there. Also, IEEE floats have an implied MSB for normalized
numbers, so you get one extra bit there. So now you're probably up to 11
wasted bits in a double precision (8B) BCD number. Perhaps you can argue
back nearly two bits because the exponent for a BCD number doesn't have to
have as many bits as for a binary number as each count of the exponent
results in roughly four bits shifting of the mantissa. Still, overall, it
is still 10 wasted bits.
So, OK, 0.1 (base 10) can't be exactly represented in a binary format, but
0.11111 (base 16) can't be represented exactly in an 8B BCD representation.
-----
Jim Battle == frustum(a)pacbell.net
21 Apr
21 Apr
12:21 a.m.
New subject: BCD accuracy (was: HP 85/Rocky Mountain BASIC replacement)
Nonetheless, there is a big difference between efficient use of storage and
decimal accuracy. Your last sentence sums it up perfectly, for decimal
numbers BCD is a more accurate representation.
Bob
At 09:03 PM 4/20/2001 -0700, you wrote:
At 06:58 PM 4/20/01 -0500, Joe Rigdon wrote:
...For
one thing, HPs use BCD arithmetic instead of binary so they'll much more
accurate than most other machines unless they use special software.
...
I've heard this claim many times that BCD is more accurate. I'm I just
not understanding something?
Unless you are doing financial work where the fractional numbers tend to
be inherently decimal, BCD arithmetic, for a given number of bytes of
storage, is less accurate than binary. As a BCD byte can represent only
100 states vs 256 for binary, you are going to lose more than one bit of
accuracy per byte of storage. Over a typical 13 nibble mantissa, it comes
to more than 8b wasted. Actually, it is worse than that, for a couple
reason having to do with normalization of the numbers. Firstly, a binary
representation can scale the mantissa to retain every bit possible,
whereas a BCD representation has a 4b granularity on the shifting, so it
probably wastes two more bits there. Also, IEEE floats have an implied
MSB for normalized numbers, so you get one extra bit there. So now you're
probably up to 11 wasted bits in a double precision (8B) BCD
number. Perhaps you can argue back nearly two bits because the exponent
for a BCD number doesn't have to have as many bits as for a binary number
as each count of the exponent results in roughly four bits shifting of the
mantissa. Still, overall, it is still 10 wasted bits.
So, OK, 0.1 (base 10) can't be exactly represented in a binary format, but
0.11111 (base 16) can't be represented exactly in an 8B BCD representation.
-----
Jim Battle == frustum(a)pacbell.net
8494
days inactive
8496
days old
9 comments
10 participants
participants (10)
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ard＠p850ug1.demon.co.uk -
bwit＠pobox.com -
frustum＠pacbell.net -
healyzh＠aracnet.com -
Innfogra＠aol.com -
jhellige＠earthlink.net -
jim＠calico.litterbox.com -
jott＠hamming.ee.nd.edu -
mikeford＠socal.rr.com -
rigdonj＠intellistar.net