I recently got a batch of old microcontrollers (8052 and Z8671) and I just want to get a minimum working set up for them.
Since these microcontrollers already have most everything baked into them (BASIC, RAM, ROM, Serial Ports), it seems like it'd be a simple matter of plugging them in to an FTDI chip and going about myself.
Looking at the Intel 8052 datasheet, it seems like all I need is a power source, crystal oscillator, and a serial port. Since the FTDI FT232RL is a very common and readily accessible chip, I'm using that for both power and serial I/O.
Here is what I'm using as a schematic.
With all that in place, and trying to use both minicom and picocom, I get no response from the chip at all.
What is it that I'm missing? I've tried using a similar set up for the Z8671 and haven't gotten a response as well.
Best Answer
What makes you think that these microcontrollers have BASIC built in?
There was one somewhat rare version of the 8052 that had a BASIC interpreter built in. If you have one of these, it will be clearly marked as a "P8052AH-BASIC", like this one:
These parts were neither standard nor common. The ROM in most other 8052s will contain an application-specific program that's unlikely to be useful to you.