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This website deals with old computer hardware and various self as well as replicas of hardware.
PS / 2 RS232 Mouse Protocol Converter - Operating a PS / 2 mouse on a serial interface as MS / Logitech mouse.
LPT ChipDAC - Covox Speech Thing Clone with Active Components / 7524 8Bit DA Converter
Simple LPTsnd r0 - Covox Speech Thing Clone with R2R Ladder
Disney Sound Source - Clone of the Disney Soundsource by Shockwav3
Tandy SN76489 3 Voice ISA Sound Card - ISA sound card based on the SN76489 IC built into the Tandy 1000 computer.
Passive Digital Analog Converter with R2R network aka Covox Speech Thing
For the sound output from the printer port.
Many MOD players, some games and emulators, as well as Windows 3.x support the output of audio with a Simplen LPT adapter.
Simpler flying construction actually suffices, but a small board makes it easier.
So he can be soldered together as a kit by laymen and owns itself Prima as a smaller exercise task
The schematic is very simple and was copied from Wikipedia.org.
The individual components:
Downloads