Schöner Fang, auf die Think Different Uhren bin ich fast ein wenig neidisch.
Beiträge von nilseuropa
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RMC: https://www.youtube.com/c/RMCRetro
Nostalgia Nerd: https://www.youtube.com/c/Nostalgianerd
Usagi Electric: https://www.youtube.com/c/Nakazoto -
Ich habe 2 Lisa, ein ProFile und eine tote Festplatte aus dem Museum nach Hause gebracht, in der Hoffnung, eine Lisa wiederzubeleben.
Schäume und Dielektrikum in den Tastaturen sind schon lange vorbei.
Batterie auslaufen, Rost, das Übliche...
Reinigung, Reparatur der Batterie verursachte Schäden, Austausch von Kondensatoren, Schmierung festsitzender Festplattenmechanik . . .
Beide funktionieren, die kaputte festplatte und das profile auch
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I had to go with the ATX PSU, CIA won't read otherwise. 🙁
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Well, the cassette interface is not super reliable - but I did not expect it to be better, so ... Microchess!
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I had the same problems on a Aplle IIc.
The reason was a bad cable from computer to display.
Thanks, but it is not a cable issue. If I test the video circuit without the 2519 it looks like this:
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The distortion is steady. The bending stays in one place.
This is the composite out signal (dV=2V) :
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Any idea what could cause this kind of image distortion? ( my other composite screen doesn't even pick up the signal )
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MIMEO board PIA issue ruled out, the fault lies within the keyboard.
I've quickly put together a USB to parallel ASCII converter, and lo behold
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Hello everyone,
the MIMEO seems to be functioning, but there are several issues I need to resolve.
I really hope someone more experienced can shed light on what these problems could be.
The "top half" video/char generator is producing the @ pattern as it should:
When I place the 2519 equivalent circuitry I expect the generated pattern to blink.
Although it does blink at regular intervals as it should, it introduces an error that looks like this:
The other problem is that there are only 4 different key codes that are recognized:
- CTRL+RESET --> functions normally, resets the machine which then drops into @ prompt
- ! (exclamation mark) --> the first row of keys produce ! in an alternating pattern ( every odd key )
- space --> every even key of the first row is producing a space
- backspace --> behaves like return, creates a new line with a backslash \
- all the other keys are numb
The keyboard itself is a Wendell Sander Apple 1 / Apple II Rev 1a type board from 2014,
while the daughter board is a Wendell Sander Rev 4 from 2015.
The daugther board is configured like this:
Any of your inputs is greatly appreciated,
thank you in advance.
cheers,
m.
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Actually it would save me a lot of time to just replicate your AVR solution as I don't want to develop high speed graphic games on the HX-20 -- I am doing this just to show Museum visitors, that the HX-20 was more than a manager calculator ( what their usual reaction is when they see it ).
So yes, I would like to try it if you could send me wiring diagram and the hex.
Although I tend to finish what I start
I plan to use the `libepsp` I am writing in an ESP32 so one core could just deal with communication while the other could deal with the frame buffer and composite signal generation.cheers,
m.
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Hey,
to be true, the EPSP documentation is rather hard to read, but not impossible
I've started to throw together the protocol implementation in C++, it is a bit hacky at the moment. I'll clean the code once I've got it working properly. The handshake and CRT negotiations are already working. But looking at your video You have already done all this
You are saying, that you wrote all that in AVR assembly?
Video chip on the expansion BUS sounds awesome. I do have an empty ROM box, so it could fit right there perfectly.
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I did a little bit of "luggable XT maintenance" on a Sharp PC-7100 :
- general cleaning
- PSU recapping
- display tilt mechanic fix
- new keyboard cable
- keyboard cable socket fix
- floppy drive lubrication
- hard disk file system fix
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Probably fake, right?
https://de.aliexpress.com/item…html?gatewayAdapt=glo2deu -
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Which Macintosh?
The foil is antistatic
cheers
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Our Apple-1 installation is getting into shape. I am still waiting for the Sander keyboard to arrive and need to find the damned Signetics registers, but we will get there eventually.
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Hey stef,
I have run into the same issue with my HX-20, the fast serial port just gave up on me at some point, but my plan was to use an ESP32 as video output so that there is enough room for double buffering, and a dedicated core to handle the serial traffic and the SD card.
Answer to Problem#2 - Was macht man damit --> I would like to make the external display a permanent part of the HX-20 installation in the Museum so visitors can understand the real implications of what that machine meant in 1982 on the market. ( Sitting next to a 1981 Osborne ).
Also my problem could be solved with some original hardware that seems to be impossible to find.
cheers,
m.
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Might be a permission error.
It was a machine specific error. Termination on the SCSI bus was too strong. Nevermind.
BlueSCSI rulz.
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Might be a permission error.
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Has anyone seen this error thrown after clicking on the HD icon?
After it won't boot again, as if the image file were somehow broken.
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Yepp. BlueSCSI is a totally cool project. Kudos to the devs.
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I got one, too, but the hinges broke and are difficult to repair. Seems you will run into to same problem soon. Try to fix the one on the left hand site as long as it not completly broken.
... with toilet paper ??? Oh shit.
sure, with toilet paper. what else.
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Over the weekend I've recapped / trace fixed a bunch of Powerbooks.
The common in all four of them - besides battery and cap leaks - was hard drives with stuck heads.
As last resort, I've opened all of them, and tried to lubricate their mechanics, but that didn't help.
As I am still looking for actual spin drives, I've decided to do a non-permanent mod on my 170:
The idea is that I am going to design a 3D case that would fit into the battery compartment to expose the SD card reader ( normally covered by the battery lid ). So I've quickly etched some breakouts to give blueSCSI a try. I'll report on the success when I get there. ( now back to work-work. )
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Atlas 9600 Logic Analyzer
Made in 1983 by Dolch. 256kb RAM, Z80 multiprocessor system, MP/M OS.
The generous donor also included all probes, manuals, diskettes and an 8086 development environment.
Compared to an Osborne-1.
How it should behave once operational:
The plan is to furnish an era-specific service corner in the Museum as a part of the permanent installation.
Ideally all diagnostic devices should be functional so we can use them to maintain the collection.
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I got one, too, but the hinges broke and are difficult to repair. Seems you will run into to same problem soon. Try to fix the one on the left hand site as long as it not completly broken.
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A dream came true.
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yep. in that case the POST breaks at 01 and the beep code indicates CPU error. did you check the CPU reset line?
