Cleaning house since movement therein has become difficult and while
trashing out an old piece of equipment came across a SBC consisting of
a Rockwell 6501 that ran a credit card reader. It has RS232 and what
looks like room for a peripheral chip of some ilk. Viewing at <http://elipsoid.home.comcast.net/IMG_5640.JPG
>.
If there is any interest, first respondent takes it for postage.
CRC
Sellam,
[Top answering, since inline is getting a bit long].
My fix to the array of dots the monitor was to build the Obtronix Apple-1 correctly! The problem was I accidentally swapped two resistors. On
board location D1 (upper left near video connection) R1 should be 1500ohm and the 6 resistors at C2 should be 7500ohm. I had swapped R1 with one of the 6 resistors at location C2 (I don't think the location C2 resistors will cause dots since these are pull-down resistors). I had mixed up a brown with violet, swapping a 1500 ohm resister (brown-green-red) with a 7500 (violet-green-red).
Not being a circuit guy (be nice, y'all) my mistake kinda made sense. If I remember my research correctly, pulses from the character generator and the sync signal generator are "combined" through R1, 1500ohm (for char gen) and R2, 3000ohm (for sync), meeting at the base of the video drive transistor. R1 and R2 *should* have a 1:2 ratio. My mistake (ie wrong R1) made it backwards and 2.5:1. The char gen pulses amplitude was less than it was supposed to be. Crank up the contrast to see the characters better and you start seeing sync residuals aka dots.
Mind you, my analysis may be off.
Do you have a way to contact Yumoto Hirohisa? I'd still like to pass on this information.
BTW regarding Apple-1 photos, I was hoping someone would have copies of those at http://homepage2.nifty.com/56thWAREHOUSE/HAJIME.html
Thanks,
Scott
----- Original Message ----
From: Sellam Ismail <sellam at vintagetech.com>
To: Scott Austin <us21090 at yahoo.com>
Cc: cctalk at classiccmp.org
Sent: Friday, June 27, 2008 5:32:10 PM
Subject: Re: Apple 1 on eBay
On Fri, 27 Jun 2008, Scott Austin wrote:
> Why? In the photos of the monitor attached to the Apple 1, I recognized
> a video problem that I ran into when I built my Repro Apple 1. It's an
> array of small dots across the entire monitor screen. I wanted to
> contact the owner to provide my bit of insight on the problem.
Interesting! I too saw this issue on an Apple-1 I brokered a couple years
back. If you turn down the contrast or something it seems to go away.
What is your fix?
> Does anyone know the Japanese owner(s) of Apple 1('s)?
I have one in my registry. He bought the first Apple-1 I brokered in 2000
(at VCF 4.0).
> At one time I only had the last name of an owner who had two Apple 1's.
> Could it be him?
This particular Japanese owner has two, so maybe/probably. His name is
Yumoto Hirohisa. This is public knowledge, by the way, his story having
been written about in Christine Finn's book, _Artifacts: An
Archaeologist's Year in Silicon Valley_.
> Does anyone have photos of a Japanese owner with his Apple 1?
In fact, there's one in the book :)
I have extra copies available for sale or trade (I think they cost me $20
or so).
--
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 ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
>From a big lot of stuff I picked up recently, free for cost of
shipping (or local pickup of course) from 60074 USA:
- Tecmar Treasure Chest Technical Reference
- Tecmar Treasure Chest Users Guide
- Tecmar Catalog 104 (memory/tape/hard disk/gfx/video/comms)
- Tecmar Companion Software User's Guide
Would prefer they all went out at once!
Thanks
-j
Does anyone have Eclipse S/140 prom images (or a S/140 whose proms might
be copied)? I'm long Nova 4s and toying with the idea of teaching one to
be an S/140.
--
Chris Kennedy
chris at mainecoon.com AF6AP/AFA6KY
http://www.mainecoon.com PGP KeyID 108DAB97
PGP fingerprint: 4E99 10B6 7253 B048 6685 6CBC 55E1 20A3 108D AB97
"Mr. McKittrick, after careful consideration..."
Rescued a TI99/4A over the winter and really need to "do" something
with it... SO, I'll offer it to the group. Original box in decent shape
(missing internal foam clam-shell packing material); has 2
joysticks; speech synthesizer; Terminal Emulator II module; AC adapter; dual cassette adapter cable; TV adapter + some documentation. Unit itself in good shape, though not 'perfect'. Glad to ship or you can pick-up anytime. I have some photos; basic tests out okay.... Net weight 9 pounds/15 ounces; 4.5Kg. Shipping probably 12 pounds. A little extra to cover shipping tape and gas to the PO appreciated... Contact off-list. Bill KA3AIS
____________________________________________________________
Click here for low prices on a huge selection of popcorn poppers!
http://thirdpartyoffers.juno.com/TGL2131/fc/Ioyw6iiesgNNeiRldbQV6wWjWEaVGWM…
I'm in the market for an Altair 8800 with all the trimmings. If you've
got one to sell, please contact me directly at <sellam at vintagetech.com>.
Thanks!
--
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 ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
> I need help with placing a value on a Cray YMP/EL8 fully loaded with
> complete documentation and software (boxes is over 50 pounds) with it.
If this is for a tax purposes, and this was a donation to your "museum"
you should not be attempting to declaring its value.
This should be done through an independent appraiser, like Sellam, by the donor.
http://www.upstatehistory.org/services/Resources/taxarticle.html
CHM follows these guidelines.
Good Day All
I need help with placing a value on a Cray YMP/EL8 fully loaded with
complete documentation and software (boxes is over 50 pounds) with it. I
picked it all up last weekend. I already sent a request to Sellam for help,
but wanted to get other opinions as well.
Thanks in advance for any help,
John K
Hello everyone,
I was recently contacted by a software developer that had an old Sage IV computer that needed a new home. He found me through my Sage and Stride website (http://www.sageandstride.org). He used the Sage IV in the 1980's as part of an Amiga Development System. He was extremely generous and donated both the Sage IV and the Amiga Development System to me, along with software and documentation.
I've checked the Sage IV and it is booting to the floppy drive but the hard drive is being a little troublesome. I'll deal with that later. I would like to ask the cctalk community for some ideas on how to bring up the Amiga Development System ... without damaging it.
I've posted pictures of the Amiga Development System on WebShots:
http://entertainment.webshots.com/album/563890692JxMvHh
I'm in no rush to 'boot' the Amiga Development System. I imagine there aren't too many of these floating around, so I want to be extremely careful about bringing it up.
I found some pictures that show a system that appears similar, including the wooden keyboard enclosure (I think these are Dale Luck's).
http://www.amigau.com/aig/commodore/devbox_black.jpghttp://www.amigau.com/aig/prototypes/cbm-lorraine-portrait.jpghttp://www.amigau.com/aig/prototypes/amigapcdev.htmlhttp://www.amigau.com/aig/prototypes/cbm-lorraine-portrait.jpg
>From the docs and what I've learned by talking to other early Amiga developers, the Sage IV was used in developing a lot of the early Amiga code. The Sage IV that I just received uses the Idris OS (Unix clone) and it included the full Idris set of install diskettes and documentation (or so it appears) for the Sage IV.
My hope is to show this at the Vintage Computer Festival this fall in my Sage and Stride exhibit, hooked up to a running Sage IV, etc.
I would appreciate any suggestions. Thanks!!
Regards,
david.
-----------------------------------
David W. Erhart
daviderhart at hotmail.com
daviderhart at sageandstride.orghttp://www.sageandstride.org
California, USA
