On the switches. NKK makes a miniature toggle with the large paddles (TY frame). They look more like the
original Imsai but may be as close as you can get. The Ithaca switches look pretty custom. Maybe the gentleman
than has the 3D printer who made card extractors could whip up some paddles for ya.
It's probably too soon to say anything but I've almost completed my PCB design of a complete drop in replacement
for the original IMSAI CPA front panel. It just finished auto routing but I started over after adding the SLOW STEP
feature (Thanks Paul!). It has the same design as the FP mini with the addition of the AC power switch.
On 09/19/14 05:04 PM, Steven Feinsmith wrote:
Thanks for measured information and superb pictures that can help to create clone board. Wow, you are lucky to have this hardware that you bought from the doctor. I tried to get one for years but ebay sellers want to sell for several thousand dollars. That is why I gave up and seek to create clone front panel. For physical appearance, it will be impossible to make 100 percent as original one.
I will try to work the board though KiCAD program. Hopefully, group from S-100 can help each other's to work this project.
Thanks,Steven--
On Thursday, September 18, 2014, Kipp Yeakel <kye...@stny.rr.com> wrote:
--I will try to do this tomorrow. One of my systems came from a doctor's office, I bought it from the doctor. It was in daily use generating his billing, back then. I did the usual capacitor change and contact cleaning, and she has been running ever since. This is one of the machines that has no diode pack.
Kipp
Sent from my iPadHi,--
Can you kind to measure your DSP-1 front panel board in length for me then I will get prototype board at correct length. Also check with height too.
I also received email message from my old friend in California and he checked his DSP-1 and said he did not have "Diode Pack" installed. It is possible that part was an optional item.
I will build the prototype without "Diode Pack" and then add it later to compare bus signals.
Thanks,
Steven
On Saturday, September 13, 2014 3:00:10 PM UTC-4, Steven Feinsmith wrote:Hi everyone,
I have very little documentation for Ithaca Intersystems DPS-1 system. This device was last manufactured before S-100 become obsolete due to Apple and IBM hit the market in 1980's. The front panel for DPS-1 system was one of the best designed. Nowdays, there were impossible to find it. I reviewed components that used for the front panel were available from varies sources.
But one component, IC7 as labelled as "Diode Pack". I realized there was no information about it. I looked the schematic showed "HEADER" contained D0-D7 (Data Bus) to AM25LS2521PC, Eight Bit Equal To Comparator (AM = Advanced Micro Devices) connected for Data Breakpoint (Low) and Breakpoint Enable (Low). Other side connected to front panel DATA switches. Between "Header" and AM25LS2521PC, there are "Diode Pack" as IC7. The "Diode Pack" hook up with D0-D7 bus, +5 volt and ground. That is all what the schematic showed.
What do you think about inside the "Diode Pack". Perhaps array of diodes? Perhaps pull-up or pull-down resistors?
I enclosed a manual, "A FRONT PANEL FOR THE S-100 BUS" by Ithaca InterSystems, Inc, 1979. The company languished in the 1980's, not being part of the domination of the IBM PC and PC clones. The company was dead for more than 30 years ago. Hopefully, you have skill to find out what is inside of the diode pack.
It would be nice for N8VEM group to create clone version of this wonderful front panel. By the way, you know about "Header" is capable to run 16-bit system by add 8 data buses, more data switches and more data LEDs. IT may sounds like a big challenge for us to create new generation of front panel board. Good idea?
Thank you,
Steven
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