EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: mawyatt on December 18, 2021, 04:48:22 pm
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While cleaning out our attic we came across this ~1980 ET-1010A Digital Scope and Spectrum Analyzer from ETI. This was developed for the Apple II and used a PCB that mounted on the Apple II bus. Program was on a 5 1/4" Floppy Disk. Remember writing the baseline 6502 code in real time machine language, where we kept track of each clock cycle for each command. Very tedious and convinced me I didn't want to be a programmer ;)
We sold these with ads placed in EDN and Electronics Design back then.
Anyway, sometimes fun to dial back the clock and try and remember those early days :-+
Best,
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That is cool. I see one chip on the board and two open DIP footprints. Apparently this one isn't fully populated?
Many years ago (as a teenager) I designed a PCB for my Apple II using I believe some 6000-series VIA and an 8 bit ADC, ADC0803 or something like that, to do something similar. It never worked :(
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That is cool. I see one chip on the board and two open DIP footprints. Apparently this one isn't fully populated?
These are spare positions only. You can see the traces showing through, they only go to the solder pads next to them.
The circuit consists only of the ADC connected to the data bus, ~DEVSEL and R/~W.
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Found old brochure!!
Best,
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That is cool. I see one chip on the board and two open DIP footprints. Apparently this one isn't fully populated?
Many years ago (as a teenager) I designed a PCB for my Apple II using I believe some 6000-series VIA and an 8 bit ADC, ADC0803 or something like that, to do something similar. It never worked :(
The open PCB area was for custom use. The ADC was directly connected to the Apple II bus and used the Apple memory, all timing was done by machine language routines that counted clock cycles, real PITA ???
The DIP switches set the range and address I recall, guess I need to study the manual I wrote ::)
Best,
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That is cool. I see one chip on the board and two open DIP footprints. Apparently this one isn't fully populated?
These are spare positions only. You can see the traces showing through, they only go to the solder pads next to them.
The circuit consists only of the ADC connected to the data bus, ~DEVSEL and R/~W.
Yes this was as simple a hardware solution as possible, with only the ADC directly interfaced to the Apple II bus. The ADC output was direct write to the Apple memory.
As mentioned the spare area on the PCB was used for custom work. Recall a customer that used the ET-1010A as a device to read and plot the temperature profile of a complex long temperature profile for a special plastic. The spare area hosted a multiplexer for the temperature sensor inputs.
Best,
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Yes, them good old day's with cpu cycle timing. Was indeed fiddling to get timings right, but I loved it. Did not scare me away from programming :-DD
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That's neat. I connected D->A and A->D converters to my TRS-80 Model 100.
Now I'm working on restoring a couple Apple ][+ computers.
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Found old brochure!!
Best,
Wow, you were years/decades ahead of time. You were seeing pretty far down the road. Very Cool!
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Thanks Tomorokoshi and Electro Fan, we also had an AWG that we never finished due to family issues that soon after dissolved ETI :-[
Best,
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Looks like the DIP switches are there to configure the analogue input range and if there is a a voltage divider on the input or the reference source. Nice in that the Apple ][ gave fully decoded select lines per slot, so making decoding very easy.