I don't remeber who made the chip, but I made several diy z80 machines
using a 279x. The 279x had an internal pll data seperator. All that was
needed externaly was a cap and resistor as I recall.
Les
Hi everyone!
I'm in the process of reviving an Atari pong system circa 1975. It's
actually a tele-games pong (Sears branded.) All the circuitry is
Atari, of course.
Can anyone point me in the right directions for schematics for this
beastie? Does anyone even have one and can just tell me what resistor
or cap or other fun toy is missing from C15 in this admittedly huge
graphic?
http://www.showyourmedia.com/files/1222309713.JPG
Thank you!
-Jon
jon at jonworld.com
Picked up an Otrona Attache (w/8086 option) in a trade today. Very cool
little CP/M machine and I really want to get it running (hopefully it'll
be easier than the ND-812 fiasco which I've shelved until I have a ton
of time to do some major work on the sockets...)
The Attache's power supply is non-functional. I turn it on and get
absolutely nothing out of it, not even the power supply fan is
spinning. I've verified the power switch is working and that the little
220/110V "card" is flipped the correct way. Anyone have power supply
schematics (I have logic board schematics)? Anyone seen similar
problems with this machine?
Thanks!
Josh
Phill hit it on the nose when he wrote,
>The really important thing to remember about SGI machines is that the
>contoler's SCSI ID is 0 and not the more conventional 7, this did seem
>to trip up a lot of people :)
Something I read had me firmly convinced that the machine defaulted to a boot drive on ID 0. On the downside, I feel sort of dumb, but on the upside, the machine sees the drive now :)
Thanks a lot to Phill and Dan for helping me out. The machine makes a great boot chime, which I recorded and posted here:
http://www.nuvistor.org/content/powerindigo2.mp3
John
Hi all --
Picked up an AST Hot Shot/286 over the weekend thinking it'd be a way to
trick out my already tricked out(*) PC XT. (Yeah, like I don't have
enough other projects going at the moment...)
No manuals or cabling, just the card w/10Mhz 286. It has a row of dip
switches on the "front" of the card, a 40-pin connector on the top and a
40-pin socket. I assume the socket is for an 8088 (or maybe a cable
>from the motherboard socket to the card?) and I'm guessing the 40-pin
connector might have been for a RAM expansion.
Anyone have any docs/info on this? All I can find on the 'net is a
driver and a README that's about 4 lines long :).
Thanks once again!
Josh
(*) NEC V20 CPU, 640K RAM, SVGA graphics (1MB vram!), a single 360K
floppy (classic!), a 1.2gb Maxtor SCSI connected to a T128 controller,
3Com Etherlink II-TP, SoundBlaster 2, AST sixpakplus.
A couple of months ago I was lucky enough to find a SGI Power Indigo2, with a R8000 CPU. Naturally it came with no HDD sled but it had a DAT drive on a sled which I figured would work. Only problem is that when I put a HDD on the DAT sled, using an 80 pin to 50 pin adapter (known good), I never see a HDD in the firmware (serial console).
Googling didn't produce a lot of answers so I figured I'd ask the list. Can the DAT sled be used like this? The SCSI ID selection seems to depend, a little too cleverly, on what bay the sled is plugged into, but the sled has a small cable which is supposed to plug into ID selection pins on the drive. I have nowhere to put that. Maybe the cable needs some of its pins bridged? The drive itself is jumpered to the ID that the machine expects for a boot drive.
Is a 9 GB drive too big for the firmware? I am a SGI novice, and my reading of the docs says the firmware should "just see" a correctly configured drive without entering any commands to rescan, but am I wrong about that?
Thanks,
John
I have some sort of empty board for the HP 2760A card reader.
If I had to guess I'd say it was for a diode ROM.
Anyway, if you're interested, I'll let you have it for postage.
Hi there
I wonder how I can get hold of the following CD, as I would like to run
RT11v5.7. Mentec seem to have been purchased and I can find nothing about
PDP11's or licensing on the purchaser's web site.
Are we now in an 'abandonware' phase with RT11?
thanks
Dominic Storey
dstorey at barossafarm.com
Riseley, Berkshire
You can dump and restore RX01 and RK05 images over the console port with
my dump/restore programs
http://www.pdp8online.com/ftp/software/dumprest/
For diagnostic images a good collection is at
http://pdp12.org/pdp-common/reference/papertapes/maindec.html
Also any of the .SV or .DG files at
http://www.pdp8online.com/images/index.shtml can be converted back to
BIN file to load with bin loader, click on the file name and select
convert to BIN loader format. Use the search to find the image with
the correct file.
I have some I have converted for my testing here (dhrkch, dhrkae, dhrkbg)
http://www.pdp8online.com/ftp/images/paper_tape/
Writeups for the maindecs at http://www.pdp8online.com/query_docs/query.shtml
The images from the online archive above plus some non os/8 that
can't be displayed online are also available from
http://www.pdp8online.com/ftp/images/
I think some of the OS/8 RX01's will work fine for you. Not positive
which have the paper tape reader driver. You can check with resorc and
either my online 8/E or simh if you want to verify before restoring
an image.
If your rk05's have interesting stuff not on the online images I
would like to get a image.
