Help hacking and restoring AX-350II sakhr

Página 7/18
1 | 2 | 3 | 4 | 5 | 6 | | 8 | 9 | 10 | 11 | 12

Por ali6x944

Master (197)

Imagen del ali6x944

15-02-2018, 17:06

I think I will get it from jameco:
https://www.jameco.com/z/41464-10-Major-Brands-64KX4-100NS-H...
This chip seems to be pin to pin compatible, and have the same page distribution 64k x 4...

Por ali6x944

Master (197)

Imagen del ali6x944

16-02-2018, 08:14

For the FDD can I use 1.44M drive?
And is their an msx compatible gotek drive?

Por Alexey

Guardian (3385)

Imagen del Alexey

16-02-2018, 12:46

You can't use the 1.44mb floppy for MSX instantly. You need to convert it by switching it to 720kb mode and to enable READY signal on pin 34.

The factory-made GOTEK should be reflashed with HxC or (better and cheaper) with FlashFloppy firmware in order to be MSX compatible. The whole operation takes 5 minutes.

Por maxis

Champion (512)

Imagen del maxis

16-02-2018, 17:11

ali6x944 wrote:

For the FDD can I use 1.44M drive?
And is their an msx compatible gotek drive?

What are your skills in soldering/HW debugging and what is your tool set? Do you have an oscilloscope, if yes then which one? This will help us in finding a better solution for you, which you can implement.

Por ali6x944

Master (197)

Imagen del ali6x944

18-02-2018, 08:51

Well I can solder decently enough to go without cold or cracked joints, I have an ever-aging TQ-77 goot soldering iron, a rigol DS1054Z hacked to 100MHz and all options, and good amount of logic gates 74 series mainly with a bunch of monolithic chips, an static ram and flash rom, also have a rom programmer.

Por maxis

Champion (512)

Imagen del maxis

18-02-2018, 10:18

ali6x944 wrote:

Well I can solder decently enough to go without cold or cracked joints, I have an ever-aging TQ-77 goot soldering iron, a rigol DS1054Z hacked to 100MHz and all options, and good amount of logic gates 74 series mainly with a bunch of monolithic chips, an static ram and flash rom, also have a rom programmer.

Excellent, so then adapting the 1.44 floppy is not a problem for you at all. Drive has to be reconfigured to provide disk ready and disk change logic.
However, before changing anything, just hook up the standard 1.44 floppy, set DS0 instead of DS1 and give it a try. You have a good chance, that it will work straight ahead. If your motherboard architecture is similar to YIS805 then likely the floppy will work as is.

Por ali6x944

Master (197)

Imagen del ali6x944

18-02-2018, 12:09

Sorry, but what do you mean by DS0 an DS1?

Por maxis

Champion (512)

Imagen del maxis

18-02-2018, 12:53

ali6x944 wrote:

Sorry, but what do you mean by DS0 an DS1?

Disk Select 1 to Disk Select 0. All the PC FDDs are ALWAYS pre-configured with jumpers to respond on DS1. MSX, however, uses the standard FDD assignment. I.e. you will need to remove the jumper from DS1 and put in on DS0 position before putting the FDD into Yamaha.

Por Alexey

Guardian (3385)

Imagen del Alexey

18-02-2018, 13:54

And with DS0 you need a straight ribbon cable.

Por ali6x944

Master (197)

Imagen del ali6x944

03-03-2018, 14:16

Do any one know what is the propose of the star key on sakhr machines?
Also do you remember the problem I had with the video adapter, It is probably from the color packets in the composite video signal because when I switched it to Black and white my converter gave me a sharp crisp images, I think my adapter is not handling the color video correctly, see the comparison photos and video below:
https://drive.google.com/file/d/1h5v1LU4J3nwYZ0nV7qrW0HPydLG...
https://drive.google.com/file/d/1XBmhmdVskxnH2vruM7iZsrTjzOq...
https://drive.google.com/file/d/1ttb6ImzL-uqAa9V0aA28yPZIupX...

Página 7/18
1 | 2 | 3 | 4 | 5 | 6 | | 8 | 9 | 10 | 11 | 12