Was there more or less a standard or reference 6502 assembly language (e.g.
>from MOS) with regard to syntax and pseudo ops? With the cpu being used in
so many different computers, and so many vendors writing their own
assemblers for each platform, did the assemblers tend to resemble each
other (besides the instruction set), or did everyone tend to do their own
thing?
Opening the rom cartridge is a little tricky it's holding together through four rivets. You need to heat them before they can be removed, there is a big change you will damage the housing.
But with some glue logic it should be possible to read the rom with a programmer. And I know at least three 98228A ROM's, one in Australia one in the UK(London area) and one in the Netherlands ;)
-Rik
-----Oorspronkelijk bericht-----
Van: "Brian L. Stuart" <blstuart at bellsouth.net>
Verzonden: ?16-?8-?2014 18:31
Aan: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
Onderwerp: Re: Disk for HP 9825B
> I and others have been looking for a
> 98228A ROM for years, without luck.? If you do manage
> to find one, please consider making it available to have the
> contents of the ROM read out so we can build new ROM
> modules!? I'd love to use my 9885M with my 9825T.?
What would be involved with imaging a module? I've
never cracked on open before, or is there a way to read
its contents from the 9825 itself?
BLS
Hello Mark,
well I suppose it would be very useful for this kind of operations.
And as the whole read operation would be in the control of the PC,
you could retrieve the whole disk, or a part, or a single sector..
whatever you want.
The first step is to debug it and let it work with SIMH.
Then I will try it with my 8" double floppy unit.
At this time, adding support for any other drive would be a matter of
knowing the peripheral
control registers and producing a set of scripts from these informations.
I will keep you informed about it.
Thanks
Andrea
Hello,
I have a VAX 4000-100A (54-21797-01) that gives P-cache errors.
I would try to understand if the problem can be fixed somehow,
or if the CPU / motherboard needs to be replaced.
Anybody has NVAX CPU datasheets, including pinout to check if there's
something
wrong with basics like power supply, cache invalidate signals, etc?
Thanks
Andrea
I have a Tandon TM-848E 8" floppy drive which appears to have become a disk lathe. Or perhaps just an effective disk eraser. It's one half of an external dual 8" drive unit that I picked up off eBay several months ago. I've cleaned the heads, and I can't see any sharp spots or debris with my head-mounted magnifying lenses, but it continues to scrape rings in the oxide of a disk on both sides. I haven't tried removing the heads to put them under my microscope since that would destroy the alignment.
I've only tested it with the pair of disks that came in the drive so far. It's possible that they are bad disks with soft oxide, but I haven't seen the same scraping problem so far in the other drive of the pair. So, that one drive appears to be a disk lathe now. I haven't felt up to risking a potentially good disk in the bad one.
Have any of y'all seen this kind of problem before? Is it likely to be repairable, even if that involves removing the heads and then realigning the drive when I reinstall them? Or is it most likely that the drive is fine and I've just been putting bad disks in it? I don't have any alignment diskettes yet, but I may get some one of these days.
For the time being, I'm assuming that I'll just use the drive as a source of parts for other TM-848-series drives in my collection, like one that I have with a broken latch handle. The other drive plus the enclosure is earmarked for use with my KryoFlux.
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/
I and others have been looking for a 98228A ROM for years, without luck. If you do manage to find one, please consider making it available to have the contents of the ROM read out so we can build new ROM modules! I'd love to use my 9885M with my 9825T. Thanks.
AppleDesign, M2980, qty 16
Keyboard II, M0487, qty 1
Extended II, M3501, qty 9 (some are MUCH heavier than others, and one has a
complete hard shell cover)
Also have new in pkg Apple cables
Cindy Croxton
Electronics Plus
1613 Water Street
Kerrville, TX 78028
830-792-3400 phone
830-792-3404 fax
sales at elecplus.com
AOL IM elcpls
Hello,
i trie to copy a binary file with 6kw length from my Linux PC to a TU56
DECTape. The TU56 is connected via TD8E to the PDP-8. I work with 9k6.
Every time i try this, the transmission stops.
What id on PDP-8:
.R PIP
*DTA1:CHESS.BN<PTR:/B
^
then on Linux i send plain Chess file.
Do i need hardware flow controll on RS232? Any other helpfull hints?
Marco
