Talk:RC-5

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Matsui 1410 TV/DVD Combo addresses

I'm not going to put this in the Article, as it would constitute my own research, but since the article is rather sparse of details regarding how DVD was implemented under RC-5 I wanted to note it anyway. This of course is just a singular example from a single company, and probably isn't indicative of the industry. The Matsui 1410 TV/DVD Combo was a television released in England under the brand Matsui (brand). It uses address 0 and 1 for TV commands as expected, with the command block ending at hex39 (63), and after that the block repeats every 40hex. Eg 0xC (decimal 12) is standby, and so is 0x4C, 0x8C, 0xAC, 0xCC and 0xEC. I've run through up to hex7F (decimal 127) for the command codes for every address, but this TV doesn't seem to use the field bit. But then again could be my implementation.

I don't have a remote, so I've spent the past few days pushing command codes through an IR LED trying to work out what does what. Address 29 was the last address range I tried, because I didn't expect DVD operation to be under there.

And of course, DVD uses address 29, which per the article was intended for "Lighting". Feel bad for the poor bloke in the 80s/90s whose lights switched off when he opened the disc tray or whatever. It doesn't appear to use the field bit, so has 64 command slots, and I'm shocked at how disordered the command list is, to the point that I'm wondering if there was a physical electronics reason for it. Alas, no controller, so I can't look into it. The vast majority of the command range gives no feedback, although it's possible some of these slots are used under certain situations (such as inputting numbers).

Also worth noting is commands from address 1 like arrow/cursor movement (19 through 22) which move the cursor on the TV's settings menus do nothing on the DVD menus. Instead there are slots in address 29 used for moving the cursor (16-17 and 32-33). Given that RC-5 is one-way, and pictures of the remote don't have multiple sets of arrow buttons, I expect pressing left arrow on the remote must send both (0,21) and (29,16) at all time, but again no way to verify.

As a final point, the TV may have been able to access teletext (in which case it probably would have used the correct address for that), but I have no way to check that given the lack of terrestrial broadcasting in the UK. 211.197.11.24 (talk) 20:32, 29 May 2022 (UTC)[reply]