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TV-NET MC-1200

Posted: Thu Mar 26, 2020 4:37 am
by Fiskbit
I just picked up a TV-NET modem and figured I'd post some pictures of its PCB, since I don't think there are any online yet. This is the MC-1200 version; I have an MC-1200B coming later for comparison, and there's also an MC-1200A and a TV-NET Rank 2 MC-4800.

The TV-NET carts have a footprint exactly the size of a credit card and are about 0.1" thick. For the connector, rather than one long slot containing an edge connector, it has one hole per pin. The cart I have on-hand is SanrainF-III (Sun-Line F-III?). Video of the F-II in actual use can be seen in this commercial. I don't know how the F-II and F-III differ. The top of my cart has a lockable slot that presumably contains a removable battery, but I've not removed it in case there is still data saved on the cart.

A bunch of pictures of the exterior and some information can be found on this blog post: http://jironosuke.cocolog-nifty.com/blo ... -f3a6.html.

Re: TV-NET MC-1200

Posted: Thu Mar 26, 2020 11:34 am
by lidnariq
Quickly enumerating the ICs I see:
* Sony CXK5816SP-12L ( 2048x8 SRAM )
* Hitachi S256KP-12 ( unknown. maybe an EEPROM? )
* NEC D23C1000C-1 ( 131072x8 Mask ROM )
* NEC D65013GF503 ( uncommitted gate array )
* Sharp PC814 ( optoisolator )
* Sierra Semiconductor SC11007CV ( baud rate generator )
* Sierra Semiconductor SC11014CV ( 300/1200 baud modem )
* NEC C251C ( op amp )
* TDK RZCO5N50 ( boost converter )
* Mitsubishi M74ALS02P ( quad NOR gate )
* ?? TV-NET MC/BS.P256-01 ( mask ROM )
* 3x Samsung KS74HCTLS157N ( quad 1-of-2 multiplexer - "HCTLS", really??? )

Re: TV-NET MC-1200

Posted: Sat Apr 04, 2020 7:03 pm
by Fiskbit
I received a MC-1200B, TV-NET controller, and TV-NET JRA-PAT cart. Pictures of the MC-1200B PCB are attached. The chip in the first picture that isn't very readable says: NEC JAPAN, D65013GF503, 8840KK001.

Re: TV-NET MC-1200

Posted: Sat Apr 04, 2020 7:05 pm
by Fiskbit
The TV-NET controller is a pad with 21 buttons and a switch on the back that is recessed enough that it can't be flipped by hand. I've included a picture below from this Twitter post showing 4 different kinds of this controller; mine is the basic TV-NET version on the left. My guess is that they're all functionally the same and just have different labeling. Unfortunately, while the controller has screws, it's also held together by interior plastic tabs that I've been unable to release. If I figure out how to open it nondestructively, I'll add pictures of the PCB.

Using lidnariq's raw.nes input test (which does a strobe on $4016.0), I've found that the controller has a 24-bit report on $4017.1 and returns 1's for any additional reads. Each button's report appears to be independent; there doesn't seem to be a limit or any ghosting. The bits come in the following read order (using the labeling on the standard TV-NET variant):

0: P/T switch (1 if T)
1: 終了 (Shuuryou / End)
2: F3
3: (Always 1)
4: F1
5: F2
6: F4
7: F5
8: 1
9: 4
10: 7
11: (Always 1)
12: 2
13: 3
14: 5
15: 6
16: *
17: Left
18: 実行 (Jikkou / Run)
19: Right
20: 8
21: 9
22: 0
23: .