Apple-1-HW/RC6502-Apple-1-Replica
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RC6502 Apple 1 SBC/README.md
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@ -8,6 +8,8 @@ Excited yet? Ofcourse you are, the next step is getting a PCB made and with the
The project uses only beginner-friendly through-hole components, these have a set of pins or wires that are threaded through the holes of the PCB and then soldered on the backside of the PCB. You can assemble it in the order of your own choosing, but there are ofcourse easier things to start with; do smaller parts such as the resistors first, then followed by the capacitors, IC sockets and then finally the larger components. By doing it this way, we're gradually going from the components closest to the board and successively moving onto taller components - this makes it easier to keep everything flush with the board. The components icons on the top of the PCB, what we hardware geeks usually refer to as the silkscreen, shows you which components goes where - take care that they are oriented the correct way, where it matters it'll be marked. Sockets will have a little indent marked on it similar to what you find on the PCB, for the electrolytic capacitors (round towers) you'll be able to match a stripe on one of the sides to the filled half of the symbol.
![Board overview](https://github.com/tebl/RC6502/raw/master/RC6502%20Apple%201%20SBC/gallery/2017-07-09%2015.17.02.jpg)
Take it slow and steady, enjoy the feeling of building a computer by hand. Study the text on the backside of the PCB, it'll have some hints on it describing what most of the components you are installing actually does! If afterwards you want to study everything in detail, you can do so by studying the schematic for the whole thing at your leasure. Having problems with it? Now, I'm afraid you no longer have the option to avoid the schematic, but happily most problems can be fixed by verifying each connection by using a cheap multimeter set to continuity. If you print the schematic, you can mark what you've checked with a pen - what fun! Sometimes the wrong things have been accidentally connected, usually by a stray splash of solder - these are quickly found using the same continuity check, systematically work through each of the ICs to see if pins next to each other have been connected without a corresponding link on the schematic. Don't feel bad that everything didn't work from the get go, that just means you got some extra opportunities to learn even more!
The originally designed computer had circuits for displaying data on a screen and reading input via a physical keyboard, but to keep things simple we are instead using an Arduino Nano to replace these parts - that way don't need to buy an antique keyboard or a scary CRT monitor to use it! You communicate with the computer you built using a terminal emulator program such as PuTTy, SecureCRT or similar over the serial interface provided by the Nano. The Nano of course also need some software running on it, you'll find that in the form of an Arduino project called "PIA Communicator" in the [folder](https://github.com/tebl/RC6502/tree/master/RC6502%20Serial%20IO/pia_communicator) for the Serial IO module.
@ -19,7 +21,7 @@ At this point you'll have learned a lot, after all you've actually built an enti
# Schematic
The supplied KiCad files should be sufficient as both a schematic and as a starting point for ordering PCBs (basically you could just zip the contents of the export folder and upload that on a fabrication site), the schematic is also available in [PDF-format](https://github.com/tebl/RC6502/raw/master/RC6502%20Apple%201%20SBC/export/RC6502%20Apple%201%20SBC.pdf) so that you can refer to it while troubleshooting. You could even print it out and hang it on your office wall, excellent conversation starter at any technology-oriented business worth working at!
![PCB Preview](https://github.com/tebl/RC6502/raw/master/RC6502%20Apple%201%20SBC/export/pcb.png)
![Completed board](https://github.com/tebl/RC6502/raw/master/RC6502%20Apple%201%20SBC/gallery/2017-07-09%2015.17.21.jpg)
# BOM
This is the part list as it stands now, most should be easy to get a hold of from your local electronic component shop though you might have to consider other sources for the older parts such as CPU, memory and PIA. Personally I bought most components with free shipping from China via AliExpress, prices will vary though you should be able to find most components in larger quantities than you'll ever need for the cost of a few cups of fancy coffee! You don't need the newest and fastest components, it's going into a 70s-era computer so don't go overboard unless you want to (you can replace 74LS ICs with 74HCT or 74ALS if you want something newer). Most components have been produced by various manufacturers, these mostly do the same thing without any relevant differences though the choice of CPU and PIA could lead to incompatibilities so I've specified the ones I've had success with (probably also the cheapest ones available).