XS Computer One - Apple 1 Replica Project
About
This project is an attempt to build a working replica of the Apple-1 computer, made in 1976 by Steve Wozniak and released by Apple Computer Company, now Apple, Inc.
Only about 200 units of this computer were made. Today, only about 60 units still exists, and less than 10 are known working.
They are sometimes sold at auctions, for record prices. In 2012, one was sold for $671,000.
To my knowledge, three replica projects exists:
Replica-1 by Vince Briel, Mimeo-1 by Mike Willegal, and Obtronix by Steve Gabaly.
The last two are exact replicas, while the first one uses actual components with a different motherboard layout.
So this project will be (hopefully) a fourth one.
I decided to build my own replica from scratch, as it's a very nice occasion to learn about electronics.
As a programmer, I sometimes feel frustrated not to know more about this... ; )
Roadmap
There's of course no real roadmap yet, as I'm currently learning as I go. The project will surely takes a huge amount of time, so don't expect results too soon.
Here are the actual project parts:
| # |
Part |
Status |
Description |
| 1 |
Learn |
In progress |
Learn as much as possible on electronics, as I'm completely new to this. |
| 2 |
Test |
|
Experiment with a few basic PCB and components. |
| 3 |
Component Identification |
In progress |
Get the original component specification from the original schematics and documentation. |
| 4 |
Component Purchase |
In progress |
Purchase components or find alternatives if they are not available anymore. |
| 5 |
ROM |
|
Find a way to get the original ROM and have it built somehow. |
| 6 |
Prototype |
|
Get a prototype working on a breadboard. |
| 7 |
PCB Design |
|
Design the final PCB, as close as possible to the original Apple-1, and have it printed. |
| 8 |
Mounting |
|
Mount all components on the motherboard. |
Tools & Equipment
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| B&K Precision |
DP 21 |
Logic Probe / 20 MHz - 30 Ns |
N/A |
1 |
Yes |
- |
| Fluke |
87-V |
True RMS Digital Multimeter |
N/A |
1 |
Yes |
- |
| Global Specialties |
PB-105T |
Breadboard |
N/A |
1 |
Yes |
- |
| Power Bright |
VC500W |
120 V / 220 V Voltage Transformer |
N/A |
1 |
No |
- |
| Weller |
WECP-20 |
Soldering Station |
N/A |
1 |
No |
- |
| Weller |
7881 |
Desolder Pump |
N/A |
1 |
Yes |
- |
| Kester |
24-6040-0027 |
Solder / 60/40 - 0.79 mm |
N/A |
1 |
Yes |
- |
| ArcOne |
G-FLY-A1101 |
Safety Goggles |
N/A |
1 |
Yes |
- |
| CadSoft |
EAGLE |
PCB Design Software |
N/A |
1 |
Yes |
- |
Note: Any equivalent tool may be used. Tools listed here are the one I'll use for the project.
Hardware Parts - Power Supply
Power Transformers
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| Stancor |
P-8380 |
117 V / 10 V CT - 3.0 A |
Triad Magnetics F-31X |
1 |
Yes |
- |
| Stancor |
P-8667 |
117 V / 28 V CT - 1.0 A |
Triad Magnetics F40X |
1 |
Yes |
- |
Rectifiers
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| ??? |
MR500 |
50 V / 3.0 A |
MCC FR301-TP |
4 |
Yes |
- |
| Fairchild Semiconductor |
1N4001 |
50 V / 1.0 A |
N/A |
4 |
Yes |
- |
Capacitors
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| Sprague |
53D113G025JP6 |
Radial Aluminum Electrolytic / 15 V - 5300 uF |
??? |
1 |
Yes |
- |
| Sprague |
53D382G050JL6 |
Radial Aluminum Electrolytic / 25 V - 2400 uF |
??? |
2 |
Yes |
- |
| ??? |
??? |
Radial Aluminum Electrolytic / 25 V - 22 uF |
Vishay MAL213826229E3 / Nichicon TVX1E220MAD1LS |
4 |
Yes |
- |
Voltage Regulators
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| STMicroelectronics |
LM323K |
+15 V / +5 V - 3.0 A |
N/A |
1 |
Yes |
- |
| National Semiconductor |
LM320 MP-5 |
-15 V / -5 V - 1.0 A |
Fairchild Semiconductor LM7905CT |
1 |
Yes |
- |
| National Semiconductor |
LM320 MP-12 |
-25 V / -12 V - 1.0 A |
Fairchild Semiconductor LM7912CT |
1 |
Yes |
- |
| National Semiconductor |
LM340-12 |
+25 V / +12 V - 1.0 A |
Fairchild Semiconductor LM7812CT |
1 |
Yes |
- |
Heatsinks
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| Wakefield |
680-125A |
1.5 C/W |
N/A |
1 |
Yes |
- |
Fuses
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| Littelfuse |
|
Axial Glass / 3AG Slo-Blo / 125 V - 0.5 A |
??? |
1 |
No |
- |
Connectors
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| Molex |
09-65-2068 |
6-Pin Power Connector |
N/A |
1 |
Yes |
- |
| ??? |
??? |
4-Pin Video Connector |
??? |
1 |
No |
- |
| ??? |
??? |
22-Pin Connector |
??? |
1 |
No |
- |
| ??? |
??? |
B4 (Keyboard?) |
??? |
1 |
No |
- |
Hardware Parts - Terminal Section
Capacitors
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| ??? |
??? |
Radial Aluminum Electrolytic / 25 V - 22 uF |
Vishay MAL213826229E3 / Nichicon TVX1E220MAD1LS |
1 |
Yes |
- |
Crystal
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| ECS |
ECS-143-S-1X |
HC-49/U / 14.31818 MHz |
N/A |
1 |
Yes |
- |
TTL
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| Texas Instruments |
7400 |
Quadruple 2-Input NAND Gate |
??? |
3 |
Yes |
- |
| Texas Instruments |
7402 |
Quadruple 2-Input NOR Gate |
??? |
1 |
Yes |
- |
| Texas Instruments |
7404 |
Hex Inverter |
??? |
2 |
Yes |
- |
| Texas Instruments |
7408 |
Quadruple 2-Input AND Gate |
??? |
1 |
Yes |
- |
| Texas Instruments |
7410 |
Triple 3-Input NAND Gate |
??? |
2 |
Yes |
- |
| Texas Instruments |
7427 |
Triple 3-Input NOR Gate |
??? |
1 |
Yes |
- |
| Texas Instruments |
7432 |
Quadruple 2-Input OR Gate |
??? |
1 |
Yes |
- |
| Texas Instruments |
7450 |
Dual 2-Wide 2-Input AND-OR-Invert Gate (One Gate Expandable) |
??? |
1 |
Yes |
- |
| Texas Instruments |
74123 |
Dual Retriggerable Monostable Multivibrator With Clear |
??? |
1 |
Yes |
- |
| Texas Instruments |
74157 |
Quadruple 2-Line to 1-Line Data Selector/Multiplexer (Noninverting) |
??? |
2 |
Yes |
- |
| Texas Instruments |
74160 |
Synchronous 4-bit Decade Counter With Asynchronous Clear |
??? |
1 |
Yes |
- |
| Texas Instruments |
74161 |
Synchronous 4-bit Binary Counter With Asynchronous Clear |
??? |
5 |
Yes |
- |
| Texas Instruments |
74166 |
Parallel-Load 8-bit Shift Register |
??? |
1 |
Yes |
- |
| Texas Instruments |
74174 |
Hex D Flip-Flop With Common Clear |
??? |
1 |
Yes |
- |
| Texas Instruments |
74175 |
Quadruple D Edge-Triggered Flip-Flop With Complementary Outputs And Asynchronous Clear |
??? |
1 |
Yes |
- |
ICs
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| Signetics |
2504 |
Shift Register |
??? |
7 |
Yes |
- |
| Signetics |
2513 (CM2140) |
Character Generator |
??? |
1 |
Yes |
- |
| Signetics |
2519 |
Shift Register |
??? |
1 |
Yes |
- |
| Signetics |
8T97 |
High Speed Hex 3-State Buffers/Inverters |
??? |
2 |
Yes |
- |
| ??? |
555 |
Timer |
??? |
1 |
Yes |
- |
| ??? |
DS0025 |
Dual Clock Driver |
??? |
1 |
Yes |
- |
Hardware Parts - Processor Section
Processor
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| MOS Technology |
6502 |
|
??? |
1 |
Yes |
- |
PIA
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| Motorola |
MC6820L |
Peripheral Interface Adapter |
??? |
1 |
Yes |
- |
Memory
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| ??? |
MK4096 |
4K RAM |
??? |
16 |
Yes |
- |
ROM
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| Intel |
3601 |
Bipolar PROM |
Signetics 82S129 / Harris H1024 |
2 |
Yes |
- |
TTL
| Manufacturer |
Part No. |
Details |
Alternative |
Quantity |
Found |
Status |
| Texas Instruments |
74154 |
4-Line To 16-Line Decoder/Demultiplexer |
??? |
1 |
Yes |
- |
| Texas Instruments |
74S257 |
Quadruple 2-Line Data Selector/Multiplexer (3-State) |
??? |
4 |
Yes |
- |
Repository Infos
Owner: Jean-David Gadina - XS-Labs
Web: www.xs-labs.com
Blog: www.noxeos.com
Twitter: @macmade
GitHub: github.com/macmade
LinkedIn: ch.linkedin.com/in/macmade/
StackOverflow: stackoverflow.com/users/182676/macmade
9f59c5991c