Problem with MSX VHD

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Por mars2000you

Enlighted (6229)

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12-03-2020, 23:56

It works now, but before it was error 404.

Por Piter Punk

Master (224)

imagem de Piter Punk

13-03-2020, 03:13

gabbafiend wrote:

The MSX HC-7 is connected…
- to a Sony CRT via a RGB 21-pin cable,
- to the VHD Player via a 13 pin DIN connector, and
- to the Aiwa Data Recorder via the necessary cable (I forgot the standard’s name).

The Japanese Victor HC-7 (and the mythical HC-7US) have the superimpose video feature built-in, without any external equipment. So you don't need anything besides the computer and the VHD player to superimpose the VHD image with the MSX generated graphics.

You're missing the cable that links the VHD Player video output to the HC-7 RGB21 input.

The 13-pin DIN connector is to control the VHD, not to superimpose anything.

Por gabbafiend

Supporter (6)

imagem de gabbafiend

13-03-2020, 07:59

First of all many thanks to mars2000you, Manuel, sd_snatcher and Piter Punk for the advice! I appreciate your help!

I tried the “Call Impose” instruction which mars2000you kindly suggested. This does not seem to work for the HC-7 but a friend suggested to try “Color 15, 0, 0” for superimposing (the numbers stand for "foreground color", "background color", " border color"). And it does work. (Thanks, Henk!Smile ) However, this changes to the original settings again as soon as the VHD games start.

Piter Punk and sd_snatcher, it sounds likely that the problem is related to the cables connecting MSX and VHD Player. So far MSX and VHD Player are only connected via 13 pin DIN connector. And the only connection to the CRT is through the MSX's RGB cable. Do you’ve any idea what kind of cable I would need?

Once again thank you!

P.S.: Unfortunately I don’t have the IF-7900 manual.

Por sd_snatcher

Prophet (3505)

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13-03-2020, 10:48

Just to be sure I understood it correctly: you mean that COLOR 15,0,0 was able to superimpose the MSX image over the VHD image with just the IF-7900 cable connecting the two?

Por gabbafiend

Supporter (6)

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13-03-2020, 16:20

sd_snatcher: I’ve to correct myself. I tried the „color“ instruction again and unfortunately it doesn’t activate the superimpose feature. This instruction only seems to change background color.

I connected a PS1 via RGB 21pin to the MSX HC-1 to see if the picture from a separate hardware can be displayed through the MSX. The PS1 picture was displayed but only for a very brief moment when I let “[5 ] Demo” run and part of the image was distorted. So wouldn't call this a success.

Do you reckon it might be also possible to connect the MSX directly with the VHD Player?

After reading your comments one more time, I found this picture on twitter:
https://pbs.twimg.com/media/DJ69u2eX0AAF3YH?format=jpg&name=...

It shows a an MSX HC-7 with IF-7900 interface and an RGB – Cinch cable. I was wondering if this kind of cable could be used to get the video and sound signals from the VHD Player directly into the MSX?

On the same Twitter account already mentioned, I also found this VHDpc advertisement:
https://twitter.com/Supmsx/status/909372823482847232?s=20

This shows a set up with VHD-Player and MSX simultaneously connected to the CRT; the VHD Player via Cinch / RCA and the MSX via RGB.

I tried this with my CRT as well and it delivered the best result so far. The VHD video and the graphics by the MSX are superimposed. But the MSX graphics are heavily distorted and I don’t get any sound effects from the MSX, only the sound from the VHD Player. I'll give it another try tomorrow.

Por gabbafiend

Supporter (6)

imagem de gabbafiend

13-03-2020, 16:37

To visualize how connecting MSX and VHD Player might look like, Henk was so kind create this quite helpful image: https://pasteboard.co/IYV5Xbx.png

This looks very feasible to me. Any opinions?

Por mars2000you

Enlighted (6229)

imagem de mars2000you

13-03-2020, 16:55

Little remark: the Victor HC-7 does not need the HC-A602S module as it has internal superimposing features. This module is only for the HC-5, HC-6 and HC-60 computers.

Por Piter Punk

Master (224)

imagem de Piter Punk

13-03-2020, 16:57

The only video input signals in HC-7 are in the RGB21 connector. You need to connect:

1. VHD player output in HC-7 RGB21 (make sure your cable have the input pins connected)
2. HC-7 "Monitor/VTR" output connected in your Television input

The sound goes out through the "Monitor/VTR" connector. You can change the sound balance using the knob at back of HC-7.

Por sdsnatcher73

Prophet (3236)

imagem de sdsnatcher73

13-03-2020, 18:23

I think that schematic is wrong, HC-7 and HC-A602S both have the VTR-REC connector (VTR being Video Tape Recorder, om the west we used VCR or Video Cassette Recorder). This is the input for the A/V signal whether it is VHD or VTR. Of course I don’t own this hardware bit that makes most sense to me from how the connectors are labeled. Also it does not make sense to loose RGB output when using super-impose functions.

Por Piter Punk

Master (224)

imagem de Piter Punk

13-03-2020, 20:16

MONITOR/VTR-REC is an output *to* a Video Tape Recorder. So you can check (Monitor) or save (VTR-REC) the result of your video editing.

RGB21 have both *input* and *output* signals. I don't know if the output signals show the superimposed images. But the inputs are only there.

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