econet
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econet [2013-09-22 12:38] – [Model B Upgrade Kit] tim | econet [2013-10-03 13:15] – 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, I would suggest building it into a hub unit with 4-5 sockets (2 passthrough and 2-3 workstation), | ||
+ | |||
+ | ===== 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 | ||
+ | |||
+ | ===== 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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| 4 | 56K 0.25W 2% resistor | | | | 4 | 56K 0.25W 2% resistor | | | ||
| 4 | 100K 0.25W 10% resistor | | | | 4 | 100K 0.25W 10% resistor | | | ||
- | | 1 | 22K x8 resistor pack | (to be identified from motherboard/ | + | | 1 | 22K x8 resistor pack | Farnell 9356924 £0.31 |
| 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 | | ||
| 1 | 74LS132 | Farnell 1470858 £0.54 | | | 1 | 74LS132 | Farnell 1470858 £0.54 | | ||
| 1 | 74LS244 | Farnell 1739688 £0.72 | | | 1 | 74LS244 | Farnell 1739688 £0.72 | | ||
- | | 1 | 75159 | (£3.80 from ebay) | | + | | 1 | 75159 | (£3.80 from ebay, £3.17 from digikey, £3.13 from mouser) | |
- | | 1 | 68B54 | (rare item, ordered from ebay by Al) | | + | | 1 | 68B54 | (obsolete |
| 2 | LM319 | Farnell 1094247 £0.80 each (until stock exhausted, then 9487581 £2.15 each) | | | 2 | LM319 | Farnell 1094247 £0.80 each (until stock exhausted, then 9487581 £2.15 each) | | ||
| 1 | 74LS163 | Farnell 1470787 £0.66 | | | 1 | 74LS163 | Farnell 1470787 £0.66 | | ||
| 1 | 74LS123 | Farnell 1470902 £0.38 | | | 1 | 74LS123 | Farnell 1470902 £0.38 | | ||
| 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 | (footprint | + | | 1 | 5-pin DIN PCB socket | 180-degree 5-pin. Appears |
- | | 1 | 8-way wafer plug | (looks like header | + | | 1 | 8-way wafer plug | 8x2 0.1" |
| 7 | mini-shunts | (to be identified) | | | 7 | mini-shunts | (to be identified) | | ||
econet.txt · Last modified: 2015-10-05 15:55 by 127.0.0.1