econet
Differences
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econet [2013-10-03 13:16] – [Terminators] tim | econet [2013-10-17 19:41] – [BBC Model B Upgrade Kit] tim | ||
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Option 2: [[http:// | Option 2: [[http:// | ||
- | Option 3: Build our own clock with an ATtiny and a differential driver IC. Would need to consider the maximum speed at which the ATtiny could maintain a clean clock signal. If we take this option, | + | Option 3: Build our own clock with an ATtiny and a differential driver IC. Would need to consider the maximum speed at which the ATtiny could maintain a clean clock signal. If we take this option, |
+ | |||
+ | ===== Cables ===== | ||
+ | |||
+ | 5-pin Male to 5-pin Male. One is required for each workstation to connect to a junction, and one between each junction. | ||
+ | |||
+ | Tim recommends buying some cheap ready-made cables from ebay (usually sold for audio or MIDI applications). Make sure that the cables have all 5 pins fully-connected. | ||
+ | |||
+ | We can make our own cable if we need to link further than 5M (e.g. across the length of the lab). | ||
+ | |||
+ | We should also consider whether to span between G1 and G8. It should be possible to use the spare CAT5 port next to galahad and patch that into G8. | ||
+ | |||
+ | Tim has a stock of 6-core shielded cable that would be suitable for custom cables. | ||
===== Terminators ===== | ===== Terminators ===== | ||
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| 1 | 10uF tantalum capacitor 6.3v | | | | 1 | 10uF tantalum capacitor 6.3v | | | ||
| 1 | 100pF ceramic capacitor | | | | 1 | 100pF ceramic capacitor | | | ||
- | | 1 | 74LS74 | Farnell 1105907 £0.51 | + | | 1 | 74LS74 | Ordered from Mouser |
- | | 1 | 74LS132 | Farnell 1470858 £0.54 | + | | 1 | 74LS132 | Ordered from Mouser |
- | | 1 | 74LS244 | Farnell 1739688 £0.72 | + | | 1 | 74LS244 | Ordered from Mouser |
- | | 1 | 75159 | (£3.80 from ebay, £3.17 from digikey, £3.13 | + | | 1 | 75159 | Ordered |
| 1 | 68B54 | (obsolete item, ordered from ebay by Al) | | | 1 | 68B54 | (obsolete item, ordered from ebay by Al) | | ||
- | | 2 | LM319 | Farnell 1094247 £0.80 each (until stock exhausted, then 9487581 £2.15 each) | | + | | 2 | LM319 | Ordered from Mouser |
- | | 1 | 74LS163 | Farnell 1470787 £0.66 | + | | 1 | 74LS163 | Ordered from Mouser |
- | | 1 | 74LS123 | Farnell 1470902 £0.38 | + | | 1 | 74LS123 | Ordered from Mouser |
| 1 | 2764 EPROM | (will use old EPROM from Hacklab stock) | | | 1 | 2764 EPROM | (will use old EPROM from Hacklab stock) | | ||
| 1 | 5-pin DIN PCB socket | 180-degree 5-pin. Appears to be a standard PCB footprint. | | | 1 | 5-pin DIN PCB socket | 180-degree 5-pin. Appears to be a standard PCB footprint. | |
econet.txt · Last modified: 2015-10-05 15:55 by 127.0.0.1