Generate AM Radio Broadcasts With Your Monitor

tessellation writes: "Tempest for Eliza is a program that uses your computer monitor to send out AM radio signals. You can then hear computer generated music in your radio." Here is your big chance to disrupt free thinking radio programs in your neighborhood.

Comments

There was a change ~1980

[hawk]

The FCC tightened the requirements at about 1980. Some things were grandfathered in, but newer models had to comply.

Take apart an atary 800. It has an SS50(iirc) edge connector that was made for expansion. They had to give that up and encase the thing in about 1/8" metal to handle the RF. A side effect was a serial interface, making for slow floppies, even for its day. ON top of that, the floppies weren't interleaved at first, so that after reading a a sector, theentire disk had to spin around again before reading the next. ROM C in about 81 added interleave. My demo unit preceded this (heck, the 800 had serial number 49. I knew the owner of IMSAI #13 at the time, too). On top of that, it was unable to keep track of which track it was on, so every track change resulted in a move to 0, then counting its way out . . .

Apple redesigned the II's motherboard to cut rf, and shielded the inside of the case. I don't think this was the same time as Rev 6, which cut the purplish tint on text (by killing the color subcarrier on text lines, iirc). And the ever-popular Supermod II wadesigned by apple, but farmed out for production, so that the II wouldn't be making an RF broadcast.

These continue today. One of the reasons your laptop has an external power supply is so that the supply can be certified, rather than sending the whole laptop for certification with every minor change.

hawk