A while ago I bought an old box with integrated circuits that had been stored for many years and contained a lot of tubes with very old IS’s. As I like to build old processor boards and try to repair old computers and boards, these chips were very welcome. In one tube there were two original P8052-Basic chips and that brought back good memories of the time mid 80ties of last century when I was working as head R&D embedded programmer and hardware designer for a small company and was using the 8031 processor a lot. I even extended a tiny Basic version at that time, but the real P8031-Basic was incredible and complete, but expensive and hard to get at that time. I put these chips in my computer chips and cpu collection and one I kept aside to make a board to get it working again.
I had a latch and a memory chip in my workshop, a PCB was also there, I only needed to order a few 11.0592 crystals as these are not so common anymore. After two evenings of wiring it was finally ready and at my first attempt to run it I got a line number error all the time. I seemed that the external sram was not working and it was a small wiring error.
After I had fixed that it worked like a charm, I connected it to my VT100 terminal with the TTL serial input and after pressing the spacebar I got the prompt and I could write a small Basic program. On this page I will show you the schematic I made, some build instructions and some documentation and (source)code.
https://www.heinpragt-software.com/software_development/8052_processor_ide.html
AT89C52 – Basic
The INTEL 8052AH-BASIC is not available anymore and very rare, I have tried to put the code into a AT89C52 processor and after a few tries this worked fine. You can order a AT89C52 with the service that I will pre program the chip. https://www.heinpragt.nl/?product=at89c52-basic
Links and downloads
- https://www.heinpragt-software.com/software_development/Intel_8052_basic_computer.html
- The Microcontroller Idea Book – Circuits and programs for the 8052-BASIC Microcontroller – Jan Axelson.
- The Microcontroller Idea Book – examples Disk
- P8052_Basic datasheet.pdf
- STC89Cxx_datasheet.pdf
- BAS52 Manual.
- The original Zip file with the sourcecode of the Basic52 interpreter from Intel.
