16 Mar
2004
16 Mar
'04
1:29 p.m.
I could have sworn I had a 2100A or 2100S microcode programming guide. Can't
seem to find it, and I need one tiny bit of info from a chart in it. I have
the 21MX microcode programming guide, but this specific info is possibly
(likely) different between the two.
The 105xxx instruction calls microcode routines, where xxx represents the
"address" (bits 8-0, 0-1777). However, I don't think the
"address"
corresponds directly to a given word address of microcode. At least on the
21MX it doesn't.
The 21MX uprog guide gives a table, showing the 105xxx (and for 21MX,
101xxx) addresses and what ranges of microcode addresses they correspond to
(and in what module). I need this same info, but for the 2100S or 2100A.
Anyone have this info?
Thanks in advance!!
Jay (crossing his fingers) West
16 Mar
16 Mar
6:05 p.m.
Jay West wrote:
The 105xxx instruction calls microcode routines, where
xxx represents the
"address" (bits 8-0, 0-1777). However, I don't think the
"address"
corresponds directly to a given word address of microcode. At least on the
21MX it doesn't.
105000 through 105377. You only get 7 bits to play with. And only bits
7-4 are used as bits 3-0 of the microcode ROM address.
The lowest-numbered microcode ROM module, excluding module 0, is where
the primary jump table lives (in the first 16 words).
Is that what you're looking for?
Yes, I oughta get around to post-processing the scans into a PDF.
-Frank McConnell
6:29 p.m.
Frank wrote...
105000 through 105377. You only get 7 bits to play
with. And only bits
7-4 are used as bits 3-0 of the microcode ROM address.
The lowest-numbered microcode ROM module, excluding module 0, is where
the primary jump table lives (in the first 16 words).
Is that what you're looking for?
Yes, but I must be missing something, it
doesn't make sense to me. Is the
manual you're looking at for the A, or S? S has room for more modules.
According to docs I do have:
The 2100S has 1024 24-bit words of control store, divided into 4 modules of
256 24-bit words each. They are allocated as follows:
module 0 : 0-377 basic instruction set
module 1 : 400-777 IOP, FP, or User
module 2 : 1000-1377 FFP-1, or User
module 3 : 1400-1777 FFP-2, or User
The above is from a 2100 hp hardware repair manual, but it doesn't go into
macroinstruction address to microroutine address mapping and exactly how
that works.
That sounds like the range for all 4 possible modules is 0-1777, which also
jives with the same manual saying that bits 8-0 (9 bits) are for the
"address". I'm definitely missing something in my understanding. Probably
partially because I only have a 21mx microprogramming module and I'm trying
to make 2100 inferences from that. Where am I going astray? I guess I could
see how it is possible to use less bits than represent 1777 if you have a
jump table, but putting a jump table in whatever the lowest microcode module
is doesn't make sense to me, as the user can put different combinations of
modules in... I'm confused :\
Yes, I oughta get around to post-processing the scans
into a PDF.
I would like very much to see the relevant sections to the above
concepts!
Thanks much!
Jay
7:28 p.m.
Jay West wrote:
Yes, but I must be missing something, it doesn't
make sense to me. Is the
manual you're looking at for the A, or S? S has room for more modules.
"2100 computer". But it describes four modules, 0 through 3. 10 bits of
ROM address with the high two being the module number.
That sounds like the range for all 4 possible modules
is 0-1777, which also
jives with the same manual saying that bits 8-0 (9 bits) are for the
"address". I'm definitely missing something in my understanding.
1777 is 10 bits. Bits 9-8 are the module number. Bits 7-0 are the address
within the module.
While I want to understand the whole scoop for my own
knowledge, what I
actually need at the moment is much simpler. Given a microcode call of
105xxx, how can I determine if this is calling code in module 0, 1, 2, or 3.
"These are translated by the mapper to specific control store
addresses, depending on which module has been chosen (and hard-wired)
to contain the primary entry points. The rule here is that the lowest
numbered module in the system, excluding module 0, must contain the
primary entry points. ... In all cases, the first 16 locations of
the appropriate module are dedicated to this purpose."
-Frank McConnell
17 Mar
17 Mar
5:57 a.m.
New subject: eBay alternatives: the freecycle movement.
My favorite newspaper brought to me yesterday news of
a "freecycle" movement, both nationally and locally that
seems to match the goals of many listmembers.
http://www.freecycle.org **
National.
Lists free things that people don't want to see thrown.
Allows matching by locality, many cities/counties listed.
At first glance may be too dependant on yahoo groups.
http://www.wastematch.org
Local to NY.
Free, Cheap, Available or Wanted all included.
Looks like a good start, anyway.
Perhaps the free listings on the VCM
( http://marketplace.vintage.org )
could be networked in to one or more of the above.
I am in awe of all three websites BTW.
John A.
re: the article
http://www.nytimes.com/2004/03/16/nyregion/16free.html
** current counters:
"Number of cities freecycling: 279
Number of people freecycling: 37,128"
19 Mar
19 Mar
10:59 a.m.
New subject: eBay alternatives: the freecycle movement.
From a Japanese source:
"One category of business that really took off over the past decade is the
"recycle shop," Japanese parlance for a shop that buys stuff that people
don't need anymore, cleans it up, and sells it for a profit. Everything
from rice cookers to washing machines to skis to console games are bought
and sold in Japan's new retail underground. The most successful of these is
BookOff, a chain of used book stores that has 700 locations in Japan.
BookOff has been expanding into other areas too, with ToyOff (they sell
"almost new" children's toys) and HouseOff (used goods for your home),
PetOff (used things for your pet), and the very oddly named HardOff (used
computer hardware and electronics)."
I'm not making this up...
John A.
11:47 a.m.
New subject: eBay alternatives: the freecycle movement.
On Friday 19 March 2004 21:59, John Allain wrote:
From a Japanese source:
"One category of business that really took off over the past decade is
the "recycle shop," Japanese parlance for a shop that buys stuff that
people don't need anymore, cleans it up, and sells it for a profit.
Everything from rice cookers to washing machines to skis to console
games are bought and sold in Japan's new retail underground. The most
successful of these is BookOff, a chain of used book stores that has 700
locations in Japan. BookOff has been expanding into other areas too,
with ToyOff (they sell "almost new" children's toys) and HouseOff (used
goods for your home), PetOff (used things for your pet), and the very
oddly named HardOff (used computer hardware and electronics)."
Er wow, they've discovered second-hand shops, with a bit of specialisation.
alex/melt
11:49 a.m.
New subject: eBay alternatives: the freecycle movement.
On Fri, 19 Mar 2004, John Allain wrote:
There's also JackOff selling used car jacks, WackOff sell used LARTs, and
FuckOff selling, well, second-hand blow-up dolls. That particular chain
is running in the red however.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
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From a Japanese
source:
"One category of business that really took off over the past decade is the
"recycle shop," Japanese parlance for a shop that buys stuff that people
don't need anymore, cleans it up, and sells it for a profit. Everything
from rice cookers to washing machines to skis to console games are bought
and sold in Japan's new retail underground. The most successful of these is
BookOff, a chain of used book stores that has 700 locations in Japan.
BookOff has been expanding into other areas too, with ToyOff (they sell
"almost new" children's toys) and HouseOff (used goods for your home),
PetOff (used things for your pet), and the very oddly named HardOff (used
computer hardware and electronics)." 
12:03 p.m.
New subject: eBay alternatives: the freecycle movement.
don't
need anymore, cleans it up, and sells it for a profit. Everything
from rice cookers to washing machines to skis to console games are bought
and sold in Japan's new retail underground. The most successful of these is
BookOff, a chain of used book stores that has 700 locations in Japan.
BookOff has been expanding into other areas too, with ToyOff (they sell
"almost new" children's toys) and HouseOff (used goods for your home),
PetOff (used things for your pet), and the very oddly named HardOff (used
computer hardware and electronics)."
There's also JackOff selling used car jacks, WackOff sell used LARTs, and
FuckOff selling, well, second-hand blow-up dolls. That particular chain
is running in the red however.
16 Mar
16 Mar
6:36 p.m.
New subject: redux: 2100S microcode
While I want to understand the whole scoop for my own knowledge, what I
actually need at the moment is much simpler. Given a microcode call of
105xxx, how can I determine if this is calling code in module 0, 1, 2, or 3.
I don't really have to even know the actual location in each module, just
which module! Yes, I know calls to module 0 (basic instruction set) are
forbidden.. I just need the bit logic to know which module the 105xxx
instruction references. In the 21MX manual, there is a small table called
something like "user code to rom address mapping", I'm hoping the 2100S
manual has an equivalent. That's all I really need for the moment!
Thanks!
Jay
7431
days inactive
7434
days old
10 comments
7 participants
participants (7)
-
allain＠panix.com -
brianmahoney＠look.ca -
fmc＠reanimators.org -
geneb＠deltasoft.com -
jwest＠classiccmp.org -
lists＠microvax.org -
vcf＠siconic.com