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Spaciba Macintosh_nik !
I tried to type the hexa codes of the test found here https://www.willegal.net/appleii/6502mem.htmbut I must have made an entry error that I cannot locate.
IF that the woz mon include a checksum during memory dumps should be better.
(I know...there is only 256 bytes in proms.)
Finally I was able to load Mike Willegal's Memory TEST on the russian web site :
https://disk.yandex.ru/d/PkeDgYyDib1gqw
I had some difficulties with the AIFF. under android but VLC player solve it.
For load Mike Code from ACI :
C100R
0.3R 280.3A1R
The 4 first byte of the ram indicates the range of ram to be tested
You will need to configure them like this
To test W0-W7 RAM bank :
0: 00 E0 00 F0
To test X0-X7 RAM bank0: A2 03 00 10
Lauch the test :
280R
enjoys...
we cannot test the lower part of the ram X0-X7 because the code is housed there.The best for an exhaustive test is to swap the X and W chips and only test the W
You're welcome, glad to help. I use this free VLC player too.
By the way, I had already seen some of the Apple 1 programs but in the form of a book that I found at the municipal library around 1985...This book is available in pdf here:http://www.bitsavers.org/pdf/dec/_Books/101_BASIC_Computer_Games_Mar75.pdf
Correct link is .....................
http://www.bitsavers.org/pdf/dec/_Books/101_BASIC_Computer_Games_Mar75.pdf
Indeed the link was invalid.
thank you Tulack
Here is what Woz wrote about this book:
After a procrastination worthy of the North Pole* I started to edit the rushes
here is the first episode in French but I added English and Russian** subtitles.
On the menu: unboxing “Uncle Bernie kit” and additional components
with cost (with 2023 prices)
https://www.youtube.com/watch?v=y-iw9zcwsjo
*the next day is in 6 months.
** I don't read Cyrillic, I did the AI translation with Reverse Translation to check that the shifts in meaning are minor
Good video, it was nice to watch. I even wrote you a little bit there, which I do very rarely. Thanks for the Russian subtitles, they are much better than the ones created automatically by the YouTube algorithm. The last ones are closer to the Elvish language, or the language Master Yoda speaks, but it's definitely not Russian. )))
A new episode:
Building the 240v/50hz power supply for my Apple 1 clone.
https://www.youtube.com/watch?v=jclH6x4ZCH8
I changed the workflow to produce the subtitles
1st episode French -->English via copilot-->russian-->google translation
2nd episode French -->English via copilot-->Russian-->via copilot
@macintosh_nik can you tell me if the Russian subtitles seem improved to you?
Very detailed video, thank you! The Russian subtitles are clear, but are missing in the little bit after you cleaned the soldering iron complaint.
I would suggest to put some music on in the places where you don't say anything, because it's quite sad in silence....
@Macintosh_nik
Very detailed video, thank you! The Russian subtitles are clear, but are missing in the little bit after you cleaned the soldering iron complaint.
actually 3 minutes of subtitles had been forgotten from the Russian version. so sorry ! This has just been corrected.
I would suggest to put some music on in the places where you don't say anything, because it's quite sad in silence....
On the other hand, for the music I am very surprised because the musical track is on 100% of the video.
But I attenuated it by -30db so that the voice part is more audible on laptops.
I checked on my 2 laptops it is audible without speakers on both but the sound is better on acer than on the thinkpad
Do you have amplified speakers?
A new épisode of the construction of my Apple 1, about the Carbon vintage Resistor :
Miniature.png
https://www.youtube.com/watch?v=HfF43WmhIos
As usual with subvtitle English en Russian
Thank You!
French: Super vidéo, j'ai bien aimé les astuces de soudage et pour l'espacement des résistances. Je suis également en train de travailler sur une réplique. J'ai presque toutes les résistances au carbone également mais je n'ai pas encore commencé le soudage, donc cette vidéo arrive au bon moment.
English: Great video, I liked the soldering tips and tricks and for the spacing of resistors. I am also working on a replica. I have almost all carbon resistors as well but I haven't yet started soldering, so this comes in at a good time.
Hello there !
I am preparing my next video on assembling the Apple 1: The Diodes. I want to make sure I don't say too many incorrect things. I am well aware of the Dunning-Kruger effect and had slowly climbing the mountain of stupidity ;-).
DIODES CR1-3.png
The electron gun has to move back up to the top of the cube. For its internal organization, the counter must start at a specific value.This value is indicated by the inputs P0, P1, P2, and P3, some of which are connected to ground. These starting values are activated when pin 9, which is the load pin (indicated here as /PE), briefly goes to zero. I suppose it has an internal pull-up, so its normal state is 1.
We have three vertical signals: V5, V3, and V4, which are the respective bits of the vertical counter, plus a VBL signal, which indicates the resetting of character values contained in the 2904s, for example, during text scrolling upward or a carriage return. The values V3 and V4 are combined by an OR gate, so the value of output 13 can go to zero when the required conditions are met.
Diodes CR1, CR2, and CR3 form an OR gate (indicated as "or" in English) that isolates these signals from each other. If one of these signals goes to zero, /VSYNC goes low, causing the LOAD function of pin /PE to go to zero via the diode, thus loading the counter to its initial state. This transition to zero will not be hindered by the state of other pins, which, if at level 1, are blocked by the diodes.
In summary, these three diodes indeed form an OR gate, which would have otherwise required purchasing a three-input OR circuit, increasing the board's cost. It's a "poor man's OR gate," allowing Steve Wozniak to eliminate a circuit.
Thank for your help !
Lost me here:
"If one of these signals goes to zero, /VSYNC goes low, causing the LOAD function of pin /PE to go to zero via the diode, thus loading the counter to its initial state. "
I would think "If one of these signals goes to zero", the /PE (or LOAD pin) will go low, causing the preset on pins P0-P3 to be transferred to the outputs on Q0-Q3. If P1 and P3 are not connected as shown in the schematic, maybe they float high? In which case P3 -> Q3 which would cause /VSYNC to go high.
Yes, Retro-Tinker, I think you are right. The floating inputs of the 74166 should be 1.
However, for the video signal to reach a true zero volts, /HSYNC and/or /VSYNC need to go to zero so that the output 8 of ICC15 goes to 1 and is inverted to 0 by the output /Q1 of the 74175.
I simulated this part of the circuit in Proteus.
video.png
When this output is at zero, with the QH output of the 74166 also at zero, we get a true zero volts on the video output for synchronization.
I must humbly admit that something eludes me...
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