Started prepping the Microdata for restoration tonight. The cpu, mag
tape, and front panel are in very good condition. The power supply -
not so much. It was apparently a long term home for mice. I don't see
any chewed wiring - suprising - but their leavings induced a lot of
corrosion and rust. I'm gonna bet those batteries aren't holding a
charge. No power applied yet, going to go through the power supply
with a fine tooth comb first.
I thought the box was an M1600 for some reason, but it appears to be
an R4510. Many years ago I did own two M1600's, and this box seems
extremely similar, but the front panel is more reminiscent of the
Reality Royale rather than the M1600.
I haven't located all the stuff that came in the haul, but enough to
get started in any case.
The power supply is Microdata A20014662-002. Dare I ask.... any
Backplane - 19 Connector A20001279 rev a
Slot 1 - 8k rom maintenance interface A20001281-001 rev H
Slot 2 - control A20001273 rev E
Slot 3 - data A20001043 rev K
Slot 4 - empty
Slot 5 - memory array board CS20002234 rev D
Slot 6 & 7 empty
Slot 8 - memory control A20002241 rev F
Slot 9 - Formatted MTU control A20001274 rev G
Slot 10 - Microcomputer Systems Corp CS20002991 rev B (disk)
Slot 11 - 8way A20002615 rev J
Slot 12 - GPBIO A20002510
Slot 13 - 19 empty
It's been over 30 years since I had my hands inside the guts of a
Microdata Reality. Brings back lots of memories.
I've got the power supply pulled out and on a bench, all the cabinet
panels removed, and cpu cables marked & removed. Haven't dug the
Reflex I drive out of storage yet.
There's also a box of serial number proms :)
Pictures are at www.ezwind.net/microdata
Game on :)
> I was curious if anyone had any information about (or experience with)
> Systems MAX-80's. I have four of these, and they came with no
> accessories, documentation, etc.
> I found an operations manual and a Technical Reference manual, but
> about it.
> My only testing so far was to connect them to an NTSC monitor, and all I
> get is some static-like display. Reading the operation manuals, it says
> something to the extent that it should display static if there are no
> drives attached. But another part of the manual says it should show
> text on power-on.
It's not saying that you will get something on the screen without disk
drives attached, it's saying that AND valid boot media..Do you have boot
disks? Otherwise you're not going to get very far. On my web site I have
the scan of the page that you need to know where to attach the drive, but
it's documented in the manual. There are boot media images online you can
build using the ImageDisk.
Microsoft introduced a new "exFAT" file system a few years ago, and I
wouldn't care about it in the least, except that it is now the official
filesystem for SD-XC cards. I only care about that in that digital
cameras and such will likely only support exFAT on SD-XC cards, and I'd
like my computer, not running Windows, to be able to efficiently access
files on such cards. The problem is that Microsoft filed several patent
applications covering exFAT. One of them is application US 2009/0164440
A1, for which the US patent office has recently mailed a "Notice of
Allowance", which means that they have decided to issue the patent.
This application is titled "Quick filename lookup using name hash".
Based on the title, it sounded like they are doing what TRS-DOS 2.0 did
back in 1978, which is putting on the disk a hash table of filenames
which then refer to directory entries. TRS-DOS did that so that it
usually only needed to read two sectors to look up a file, the HIT (Hash
Index Table) sector, and the actual directory sector containing the
file's directory entry. Otherwise they might have had to read multiple
directory sectors to find the file if it existed, and all of the
directory sectors if it did not.
The claims of the patent are a little difficult to interpret. They
refer to "a first one or more computer readable storage media having
computer executable instructions...". This is basically referring to
the disk/flash/etc. the operating system is booted from. They refer to
"a second one or more..." which is the disk/flash/etc. which holds the
file system in question.
Here's are two of the independent claims:
1. A first one or more computer readable storage media having computer
executable instructions that, when executed on at least one processor,
configure the at least one processor to perform a method of detecting if
a target file name exists on a second one or more computer readable
storage media, the method comprising:
(A) determining a name hash from the target name;
(B) determining if the name hash corresponds to a directory entry
set name hash value, the directory entry set name hash value
corresponding to one of a plurality of directory entry sets, each of
the plurality of directory entry sets stored on the second one or
more computer readable storage media;
(C) determining if the target name matches a directory entry set
name corresponding to the one of the plurality of directory entry
sets after step (B) determines the name hash corresponds to the
directory entry set name hash value; and
(D) indicating that the target name exists after step (C) determines
the target name matches the directory entry set name.
19. A method of detecting if a target file name exists, the method
executing on one or more processors, the method comprising:
(A) determining a file name hash from the target file name;
(B) determining if the file name hash corresponds to a directory
entry hash value, the directory entry hash value corresponding to
one of a plurality of directory entries;
(C) determining if the target file name matches a file name, the
file name corresponding to the one of the plurality of directory
entries after step (B) determines the file name hash corresponds to
the directory entry hash value; and
(D) indicating that the target file name exists after step (C)
determines the target file name matches the file name corresponding
to the one of the plurality of directory entries.
These seem to be to be to be *exactly* what TRS-DOS 2.0 did as early as
1978, so it seems possible that TRS-DOS could be used as prior art to
invalidate at least these independent claims, and quite possibly some of
the dependent claims as well.
So my question is, are there any published works documenting the TRS-DOS
file system on-disk format, especially the use of the HIT table, other
than "TRS-80 Disk and Other Mysteries" by H. C. Pennington?
He keeps e-mailing me and asking me to pull key tops off of keyboards. NO intention of actually buying a k/b mind you (not at the price I'm asking for one, priced _not_ to sell ;). Beware of this guy, he's simply up to no good! You'll try and be nice and wind up RUINING a keyboard. What chutzpah!
?And relative to a recent thread, YES he does collect keyboards ;)
A fellow over at the SGI forums has run into some problems and need to
let go of his entire collection pretty fast.
I don't know the story, I don't know him outside of the forums but there
are some really nice machines (even DEC) in there for a person with some
storage space and a big car.
PDP11 of unknown model
Used from 1978 until "yesterday" to do the billing for Rio De
Janeiro's Metro transit billing system.
Includes an "EDMONSON" card, whatever that is.
Contact me off list if interested.
I'm pondering starting the restoration project for the M1600. One
thing concerns me though, I have fairly high suspicion that the Reflex
I drive is "beyond all recall". Before I put a lot of time in starting
that project, anyone have a spare Reflex I drive around just in case I
get to that point and it's not recoverable? I'd hate to spend all the
time on the machine and find out it's unusable. Unlike a lot of other
machines, the M1600 is a paperweight without a disc drive....