I thought about building an analog to digital converter for a classic mac (Plus to SE/30). I did this with some serial converters (TLD548 or Max187) for a serial RS-232 for PCs. For the programming of these chips you need three lines of the rs232 that you can set to high and low. Then you can read 8 or 12 bits. An example for the TLD548 (8bit conversion) is shown at this website:
I have some questions that I can not answer althoug I read a lot about rs232 and rs422:
Is it possible to program the rs422 at the macintosh (for example with Pascal) in a way that you can set single lines to high or low to start the conversion and to read the result? The PC can do this by manipulating adresses (ports) of the rs232. The program on the above website uses the lines CTS, RTS and TXD for this purpose.
Which lines of the rs422 can be used for this project? I think that HSKo, HSKi and TXD- or RXD- can be a starting point?
Did anybody of you built an A/D converter for a classic macintosh?
Analogue to Digital Converter
Analogue to Digital Converter circuit for PC serial port
www.epanorama.net
I have some questions that I can not answer althoug I read a lot about rs232 and rs422:
Is it possible to program the rs422 at the macintosh (for example with Pascal) in a way that you can set single lines to high or low to start the conversion and to read the result? The PC can do this by manipulating adresses (ports) of the rs232. The program on the above website uses the lines CTS, RTS and TXD for this purpose.
Which lines of the rs422 can be used for this project? I think that HSKo, HSKi and TXD- or RXD- can be a starting point?
Did anybody of you built an A/D converter for a classic macintosh?
