/pub/cbm/firmware/misc/c64carts/btx/

BTX, or Bildschirmtext, is/was a modem-based on-line system that started in the 1980s. It was run by the state-owned telephone corporation.

btx-mk1-325221-02.bin 2017-05-23 16384: Firmware of a BTX decoder mark I, part number 325221-02, checksum $3E0F.
This was copied from a 27128 EPROM labelled with the part number and
"BTX C64 C128".
btx-mk2-V30113-C375-81-1.bin 2017-05-23 32768: Firmware of a BTX decoder mark II, dumped from a 27256 EPROM. The sticker
on the erase window has a Siemens logo and "V30113-" at the top line,
"C375-81-1" at the middle line and "( EX )" at bottom. The checksum is
$D68F.
btx-v3.3.bin 2017-05-23 32768: Firmware of a BTX decoder mark II, version 3.3.
index.html 2024-03-19 2564: Firmware for the Buildschirmtext Decoder cartridge

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