econet
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econet [2013-09-24 18:18] – [Model B Upgrade Kit] tim | econet [2013-10-03 13:25] – tim | ||
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* File server: Level 1 (very basic) can be run on any BBC with a floppy. Level 2-3 require a second processor (which we have). Archimedes can also act as a file server with some free software. | * File server: Level 1 (very basic) can be run on any BBC with a floppy. Level 2-3 require a second processor (which we have). Archimedes can also act as a file server with some free software. | ||
- | ===== Model B Upgrade Kit ===== | + | ===== Econet Clock ===== |
+ | |||
+ | Option 1: Aftermarket and fully configurable [[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, Tim suggests building it into a hub unit with 4-5 sockets (2 passthrough and 2-3 workstation), | ||
+ | |||
+ | ===== 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 ===== | ||
+ | |||
+ | A passive design, suitable for building into a 5-pin DIN plug, is available: | ||
+ | |||
+ | http:// | ||
+ | |||
+ | | 2 | 56R 0.25W resistor | | ||
+ | | 1 | 220R 0.25W resistor | | ||
+ | | 2 | 1K 0.25W resistor | | ||
+ | | 1 | 10uF 16V tantalum capacitor | | ||
+ | |||
+ | We will probably need to purchase 1/4W resistors as most of our stock is 1/2W. | ||
+ | |||
+ | We would require two terminators, | ||
+ | |||
+ | ===== BBC Master Upgrade Modules ===== | ||
+ | |||
+ | Tim has ordered a [[http:// | ||
+ | |||
+ | We will burn our own ANFS EPROMS. | ||
+ | |||
+ | ===== BBC Model B Upgrade Kit ===== | ||
^ Quantity ^ Part ^ Supplier ^ | ^ Quantity ^ Part ^ Supplier ^ | ||
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| 1 | 2.2nF ceramic capacitor | | | | 1 | 2.2nF ceramic capacitor | | | ||
| 1 | 10nF ceramic capacitor | | | | 1 | 10nF ceramic capacitor | | | ||
- | | 1 | 10uF tanalum | + | | 1 | 10uF tantalum |
| 1 | 100pF ceramic capacitor | | | | 1 | 100pF ceramic capacitor | | | ||
| 1 | 74LS74 | Farnell 1105907 £0.51 | | | 1 | 74LS74 | Farnell 1105907 £0.51 | |
econet.txt · Last modified: 2015-10-05 15:55 by 127.0.0.1