I'm typing this on a Lenovo laptop from 2015 running Xubuntu.
I got my first
Sharp MZ-80K Personal Computer (released in kit version in 1978, and in assembled version in 1979) in 1980. It has a 2MHz Sharp LH0080A CPU (Sharp's Z80A version, under license by Zilog) with 48kB RAM and a build-in black and white CRT and a cassette drive. I still have two of those, which are fully functional. I now use the
z88dk assembler/compiler to program it, and a cheap MP3 to cassette interface to load the binaries. I also have a hardware emulator of those on
MiSTer FPGA
For quick calculations, I often use my
Hewlett-Packard HP-85 (released in January 1980). It has a 613 kHz HP Capricorn CPU, 32kB RAM and a build-in black/white CRT, thermal printer and a proprietary HP tape drive. This machine does all calculations in decimal (using
BCD) with a 12-digit mantissa and exponents up to ±499. It is fully functional, except for the tape drive - I should get an
EBTKS SD-card reader for it. I also use a
software emulator of this machine.
In 1987, I bought an
Acorn Archimedes A305 with an 8MHz ARM2 CPU and 512kB RAM (upgraded to 4 megs). Unfortunately I do not have this machine anymore, but I still run RISC OS and the software I wrote at the time, natively on Raspberry Pi and under hardware emulation on the MiSTer FPGA.
My most recent PC is an
Udoo Bolt V8 (2019) with a 3.6Ghz AMD Ryzen V1605B CPU, 32 gigs of RAM and an on-board ATmega32U4 (Arduino Leonardo compatible GPIO).
A
RISC-V MCU is currently sitting on my breadboard, but I'm getting off-topic since that is not a PC.