so, most importantly, identification: card is a Behaviour Tech Computer BTC-1853L - the sticker is on the backside of the card.
specs here:
https://theretroweb.com/expansioncards/s/behavior-tech-btc-1853l
manual:
https://theretroweb.com/expansioncard/documentation/1853l-1857l-quick-install-guide-668438aec2362440771343.pdf
i'm going to assume that you've double-checked that it is plugged into the (correct) Speaker port. i noticed that there is a jumper JP4 *specifically* for switching between speaker and line out modes.
i also noticed that JP3 mute/unmutes the entire card.
vga256 /
npub1yq…yywz8
2025-03-31 19:46:39
in reply to nevent1q…ykyj
Author Public Key
npub1yqwma5z0g73y9gvf0smayl9gfzakj7et7ldhc8km89gjs6vsgczqayywz8Published at
2025-03-31 19:46:39Event JSON
{
"id": "7467801ce8fd2791551de2222b00c4e2eb1adaf34aad442110269abe40e6c77c",
"pubkey": "201dbed04f47a242a1897c37d27ca848bb697b2bf7db7c1edb39512869904604",
"created_at": 1743450399,
"kind": 1,
"tags": [
[
"p",
"201dbed04f47a242a1897c37d27ca848bb697b2bf7db7c1edb39512869904604"
],
[
"proxy",
"https://dialup.cafe/@vga256/114258765352017026",
"web"
],
[
"e",
"e2ea56720acbd4bf51e9d0e781d8ca41b763597fc300c426a23a976bf9ff491e",
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"root",
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],
[
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[
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],
[
"proxy",
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"activitypub"
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[
"L",
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],
[
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"pink.momostr"
],
[
"-"
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],
"content": "so, most importantly, identification: card is a Behaviour Tech Computer BTC-1853L - the sticker is on the backside of the card.\nspecs here:\nhttps://theretroweb.com/expansioncards/s/behavior-tech-btc-1853l\n\nmanual:\nhttps://theretroweb.com/expansioncard/documentation/1853l-1857l-quick-install-guide-668438aec2362440771343.pdf\n\ni'm going to assume that you've double-checked that it is plugged into the (correct) Speaker port. i noticed that there is a jumper JP4 *specifically* for switching between speaker and line out modes.\n\ni also noticed that JP3 mute/unmutes the entire card.",
"sig": "88203f39505e1d9f48833b1ee3f014e1185ba6fa6f882ab1f286ad160e533311010e364859c35ad48cd5bd8891c86cd7f9e06837067a07fa919d5d3c07c7b049"
}