I've been a software engineer for over 30 years but stll hark back to my Z80 days in the early eighties. This works really well and doubles up as a Z80 chip checker for me. I would recommend this to anyone with a taste for retro-computing. I've ony used it with the Z80 RetroShield so far although I have the 6502, the 6803, 1802 and the 6809 boards also. Most of these are unfamiliar to me and I look forward to doing a bit of retro-exploration. Easy enough to use but not recommended for absolute beginners (need to be familiar with Arduino, handy with soldering and have some knowledge of 8-bit micros to get the best out of the kits.). Also handy as an interface board for the teensy as it gives you a bunch of 5V I/O pins which can be used for other purposes besides RetroSheild use.
I love the Retroshield projects - they are a great way to tinker with 8-bit CPUs and systems. Previously, I was using the Arduino MEGA to host them, but I have now switched to this Teensy kit: I'd never used a Teensy and this was a good excuse to investigate it. Assembly was easy - just the connectors, switches and an LED. Once I programmed it and connected the shield, the CPU ran way faster - I'm estimating about 0.8Mhz which means it's very close to the original Apple 1 speed. Very happy with it!
May 6, 2020
I tried assembling "Retro Shield 6502 for Arduino Mega".
I thought the idea of using only the original processor and emulating the others on the Arduino side to reproduce the computer of that time was interesting. I purchased the "RetroShield 6502 for Arduino Mega", but assembling is as simple as soldering the IC socket, header and LED. I wrote "k65c02_apple1.ino" to Arduino Mega to emulate Apple-1. The APPLE-1 OPERATION MANUAL's TEST PROGRAM worked normally. Also, BASIC started, and a simple program also worked.
I have not yet had a chance to actually use this, but wanted to drop a quick thanks to the seller here: The customer service, personal touch and build quality of this product are excellent. Cannot WAIT to tear into this thing! Bonus: It even came with a 6502 chip, which I didn't realize when I ordered it. I'll update this review once I've had a chance to use the shield in a couple weeks.