Posted By
siz
on 2015-04-18
09:23:38
|  Re: Userport adapter for uk1541 Plus4
The author (the creator of uk1541) seems to be a bit "interesting" person to me. The uk1541 uses the parallel port itself to allow emulation of parallel transfer. However he did not include the 2 handshake lines which would have been required for parallel DOS extensions (SpeedDOS, Prologic DOS, Dolphin DOS, etc). When someone asked why he said: he checked and no software uses those lines.
Back to the topic: that user port extender looks interesting because the plus/4 user port pinout is very different from the C64 one so the one on the picture can work only if a few pins (ie 1-3, GND, +5V, RESET) are used)
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