Vhd interface for victor hc90/95

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By popolon_

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26-07-2022, 16:05

Yes, thunder storm game starts now! So this victor-c9d card can be used to play vhd games that have game code in cassette.

How could this card schematics be changed to work also in other msx( other than changing connector to module port compatible?)

By popolon_

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26-07-2022, 17:35

I tried to update the wiki page https://www.msx.org/wiki/Category:Victor_BASIC#Instructions . As it maybe likely that there is no other VHD basic extension commands expect VHD and VP commands. When CALL VHD command is given, that starts VHD interpreter and inside that you cannot see any commands, at least based on youtube video where game was started with CALL VHD command.

By popolon_

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26-07-2022, 21:43

I tried those different _VP("command") variants, and at least i got visible responses for E,P,S+x,S-x,S+0,H01,H02 commands.
E is same as eject button.
P is same as play button.
S+0 is pause, but it (and all S-x and S+x commands) only works if it is enabled with command "H01". If command "H02" (or "H04") is given, then it is disabled again.
S+x is fast forward command, with different speeds (1 slowests, 3 fastests)
S-x is fast backward command, with different speeds (1 slowests, 3 fastests)
I did not however try value over 3.
RS0F0, I0, M2, M5, S1,S2,S3 did not seem to made effect, but not sure what command combination these would be affected.
So based on these there is no command to goto some chapter number, or do some time search (minutes/seconds).

By popolon_

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27-07-2022, 11:50

By the way, where is correct place in wiki to mention those superimpose commands (CALL SUPER0-4) that are on victor hc-7 (and propably in hc-6 via the impose module) and hc-9x? As currently "Victor Basic" section in wiki is only for vhd. And these superimpose commands are there even without any vhd card.

By mars2000you

Enlighted (6345)

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27-07-2022, 12:08

popolon_ wrote:

By the way, where is correct place in wiki to mention those superimpose commands (CALL SUPER0-4) that are on victor hc-7 (and propably in hc-6 via the impose module) and hc-9x? As currently "Victor Basic" section in wiki is only for vhd. And these superimpose commands are there even without any vhd card.

I will rename the current "Victor BASIC" as "VHD BASIC". So "Victor BASIC" will be available for these instructions.

By mars2000you

Enlighted (6345)

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27-07-2022, 14:44

On the HC-7, these instructions can be found with other instructions in the firmware rom.

On the HC-90/95, these instructions can be found in the RS-232C rom.

So, not sure at all for the superimposing module.

By popolon_

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29-07-2022, 22:26

I now made some kind of pcb layout for this if-c9d card, but i have not tested it.
It can be found from https://github.com/popolonx/MSX_STUFF/tree/main/vhd_c9d_card

also the corrected rgb adapter with rca inputs for dsub25 hc9x connection can be found:
https://github.com/popolonx/MSX_STUFF/tree/main/victor_hc9x_...

By popolon_

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02-08-2022, 19:44

The thunder game needed that patch from that japanese guy to work properly even in this real vhd card case.

Does anybody have knowledge how to change the card to cartridge slot compatible? Can i just ignore those jvcreq ( connect logic input to ground or +5v depending on the case) and busack and buscon signals(connect to nowhere)? And connect int01 to int, and so on?

By popolon_

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28-08-2022, 09:05

Pcb arrived, and fits there. Now waiting for lc filters and transistors.

P_20220828_095856_1.jpg

By popolon_

Champion (296)

popolon_'s picture

06-10-2022, 14:08

Meanwhile, received Naplps book, where MSX2 is mentioned, but no hardware is mentioned.
P_20221006_145848.jpg
P_20221006_145239.jpg

And the commands described in this.
P_20221006_150402.jpg

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