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| | The Unix philosophy emphasizes building simple, short, clear, modular, and extensible code that can be easily maintained and repurposed by developers other than its creators. The Unix philosophy favors composability as opposed to monolithic design.
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< | This is a good opportunity to merge old SBC technology (COSMAC Elf) with a new one (Raspberry Pi and GNU/Linux). If you are new to GNU/Linux get involved! I always admire the UNIX philosophy, I hope this project achives the UNIX goals. |
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> | This is a good opportunity to merge old SBC technology (COSMAC Elf e.g. Elf Membership Card) with a new one (Raspberry Pi and GNU/Linux). If you are new to GNU/Linux get involved! I always admire the UNIX philosophy, I hope this project achieves the UNIX goals. |
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| | LED:02 Q:0 Rx:1 IN:0 WAIT:0 CLR:0 READ:0 SWITCH:80
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| | Wiring
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It is possible that the Elf works with 3.3 V supply voltage, but this is not within the specifications. In this case the diodes are not needed. Connect the Raspi Pin 1 to P4 Pin 3 (do NOT connect Raspi Pin 2!). |
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> | Bill of materials
| Description |
Mouser Part# |
| Flat Cable 40 conductors |
517-3365/40FT |
| D-Sub 25P male |
523-L717SDBH25P |
| Header Connector 40 pol |
571-4-215911-0 |
| 9 x 1N4148 |
512-1N4148 |
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> | Cable |
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| 3 |
BCM 2, SDA |
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| 4 |
5 V |
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| 5 |
BCM 3, SCL |
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<
< |
| 6 |
GND |
(19) |
1 |
GND, - |
| 7 |
BCM 4 |
1, in |
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IN- (EF4) |
| 8 |
BCM 14, TXD |
(20) |
4, in |
RXD, RX (EF3) |
| 9 |
GND |
21 |
6 |
GND, /ON |
| 10 |
BCM 15, RXD |
(15) |
5, out, Cathode |
TXD, TX (Q) |
| 11 |
BCM 17 |
14, in |
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WAIT- |
| 12 |
BCM 18 |
16, in |
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CLR- |
| 13 |
BCM 27 |
17, in |
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WE- |
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> |
| 6 |
GND |
(19) |
1 |
GND, - |
| 7 |
BCM 4 |
1, in |
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IN- (EF4) |
| 8 |
BCM 14, TXD |
(20) |
4, in |
RXD, RX (EF3) |
| 9 |
GND |
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6 |
GND, /ON |
| 10 |
BCM 15, RXD |
(15) |
5, out, Cathode |
TXD, TX (Q) |
| 11 |
BCM 17 |
14, in |
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WAIT- |
| 12 |
BCM 18 |
16, in |
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CLR- |
| 13 |
BCM 27 |
17, in |
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WE- |
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| 15 |
BCM 22 |
2, in |
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IN0 |
| 16 |
BCM 23 |
3, in |
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IN1 |
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> |
| 15 |
BCM 22 |
2, in |
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IN0 |
| 16 |
BCM 23 |
3, in |
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IN1 |
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| 18 |
BCM 24 |
4, in |
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IN2 |
| 19 |
BCM 10, MOSI |
5, in |
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IN3 |
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| 18 |
BCM 24 |
4, in |
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IN2 |
| 19 |
BCM 10, MOSI |
5, in |
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IN3 |
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| 21 |
BCM 9, MISO |
6, in |
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IN4 |
| 22 |
BCM 25 |
7, in |
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IN5 |
| 23 |
BCM 11,SCLK |
8, in |
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IN6 |
| 24 |
BCM 8, CE0 |
9, in |
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IN7 |
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>
> |
| 21 |
BCM 9, MISO |
6, in |
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IN4 |
| 22 |
BCM 25 |
7, in |
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IN5 |
| 23 |
BCM 11,SCLK |
8, in |
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IN6 |
| 24 |
BCM 8, CE0 |
9, in |
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IN7 |
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| 26 |
BCM 7, CE1 |
25, out, Cathode |
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O0 (*) |
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| 26 |
BCM 7, CE1 |
25, out, Cathode |
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O0 (*) |
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| 29 |
BCM 5 |
24, out, Cathode |
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O1 (*) |
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| 29 |
BCM 5 |
24, out, Cathode |
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O1 (*) |
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| 31 |
BCM 6 |
23, out, Cathode |
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O2 (*) |
| 32 |
BCM 12 |
22, out, Cathode |
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O3 (*) |
| 33 |
BCM 13 |
13, out, Cathode |
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O4 (*) |
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| 31 |
BCM 6 |
23, out, Cathode |
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O2 (*) |
| 32 |
BCM 12 |
22, out, Cathode |
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O3 (*) |
| 33 |
BCM 13 |
13, out, Cathode |
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O4 (*) |
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<
< |
| 35 |
BCM 19 |
12, out, Cathode |
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O5 (*) |
| 36 |
BCM 16 |
10, out, Cathode |
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O6 (*) |
| 37 |
BCM 26 |
11, out, Cathode |
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O7 (*) |
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>
> |
| 35 |
BCM 19 |
12, out, Cathode |
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O5 (*) |
| 36 |
BCM 16 |
10, out, Cathode |
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O6 (*) |
| 37 |
BCM 26 |
11, out, Cathode |
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O7 (*) |
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| 38 |
BCM 20 |
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| 39 |
GND |
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| 40 |
BCM 21 |
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