Vhd interface for victor hc90/95

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By popolon_

Champion (287)

popolon_'s picture

26-06-2022, 13:07

In thunder game recommended hw list is Victor HC-7, Victor HC6 +HC-A602S, and National CF3000+CF2601. So the _super0/1/2/3/4 basic commands would have to be in these computers. I tried _super0 command in CF3000, but syntax error was get. Maybe the command is activated only when CF2601 is connected. I have the CF2601 unit but both power cable and the cable towards CF3000 were cut( cut cables were however send with the unit). I will repair the cable when new 12 pin jst type connectors arive.
IMG_20220626_1401332892.jpg

By leonlas

Expert (110)

leonlas's picture

02-07-2022, 01:26

popolon_

I purchased a Victor HC95A, from one man on the forum. The computer was supposed to be functional except for floppy drive B and no keyboard.
After initial startup, it started rebooting strangely and in-game showed that it only has 16Kb Ram. I think the power supply has died.
I need a good schematic of the power supply or the manual service of the entire HC95. I also need to connect a keyboard, but I don't want to occupy the card slot. I have different MSX and other 8 bit. I have a keyboard from Phillips and Pioneer. I can also make another connection if you help me in this matter: PSU diagram - servis manual and keyboard connection. I will be grateful for any help.

By Pac

Scribe (6719)

Pac's picture

02-07-2022, 18:07

leonlas, regarding the keyboard pinout, take a look at this dedicated forum thread.

By popolon_

Champion (287)

popolon_'s picture

02-07-2022, 18:32

leonlas, if you replace every electrolytic capacitor inside the psu, then that shuold help( if the problem is psu voltages). You could measure voltages when the power is on.
The link to schematics for hc9x is mentioned at the end of in wiki page, https://www.msx.org/wiki/Victor_HC-95. However it does not contain psu part. It contains keyboard pinout. To connect philips keyboard, one has to decode those Ya/Yb/Yc/Yd signals coming from hc95 into philips Y0-Y9 using for example 74ls42

By leonlas

Expert (110)

leonlas's picture

03-07-2022, 02:47

I read this thread ... It doesn't explain much to me.
I already have the HC95 schematic. My power supply does not give voltage ... I think I will put in a replacement, but I do not know what this yellow "SD" cable is.
A matrix would be useful for the keyboard - the keyboard scheme.

By popolon_

Champion (287)

popolon_'s picture

03-07-2022, 14:58

I checked with logic analyser that there is activity coming towards 8255 _CS/_R/_W/A1 when giving those _VP commands.

But i would like to check this with openmsx side also.
Does somebody know how to enable I/O ports in openmsx? Because i tried to add the I/O ports for C9D:
io base="0xBC" num="4" type="O"
io base="0xBC" num="4" type="I"
but it still gives device I/O error for _VP commands.
There is no detailed help for IO settings in openmsx setup guide in https://openmsx.org/manual/setup.html#hardwareedit, why? I am running openmsx 18.0 in Windows 7 64-bit.

By popolon_

Champion (287)

popolon_'s picture

09-07-2022, 09:42

I managed to build that mcs48 reader. I tested it with bondwell pc xt keyboard 8049 ic, and when reading twice it got same bytes out from chip. So i think now it is ready for c9d 80c49c dump.
IMG_20220709_1032111312.jpg

By popolon_

Champion (287)

popolon_'s picture

09-07-2022, 12:16

Damn, now the problem is that 80c49c solder does not come off properly with my SP-1010DR desoldering station (even with smallest nozzle), as the solder pads are so small and there is solder in both sides.

By popolon_

Champion (287)

popolon_'s picture

10-07-2022, 14:41

Ok, i had some soldering flux and it helped. Now it is desoldered.
IMG_20220710_1537460462.jpg

By popolon_

Champion (287)

popolon_'s picture

10-07-2022, 18:16

i dumped two times the rom, and same binary was get:
https://github.com/popolonx/MSX_STUFF/blob/main/vhd_c9d_card...
but who can say if this 80c49 rom has valid data or not?

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