BildTel 001 » History » Version 12
laforge, 10/30/2023 08:11 PM
1 | 9 | laforge | {{>toc}} |
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3 | 1 | laforge | h1. BildTel 001 |
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5 | 3 | laforge | The Telekom-branded *BildTel 001* was likely the first commercially available ISDN video phone in Germany. |
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7 | 3 | laforge | {{thumbnail(20231028_114259.jpg,size=400)}} |
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11 | (Only digital marketing picture I could find online, courtesy of Picture Allianze / Matthias Hiekel) |
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13 | 1 | laforge | h2. Architecture |
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15 | The system consists of the following parts: |
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16 | 2 | laforge | * A TV screen with built-in [[BTX__Prestel__Videotex__Minitel|BTX]] decoder (inherited from [[LOEWE_Multitel_TV10]]) |
17 | 1 | laforge | * A keyboard + phone-receiver combo (inherited from [[LOEWE_Multitel_TV10]]) |
18 | * A _desktop-computer-like_ box called the Codec (containing the actual ISDN video telephony part, implemented by AEG/OLYMPIA) |
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19 | * A video camera |
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21 | The BTX Terminal [[LOEWE_Multitel_TV10]] was used as the "user interface" for the device, adding the _codec_ box to turn it into a video phone. |
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23 | 10 | laforge | h3. Codec unit |
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32 | 10 | laforge | h3. TV Camera |
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36 | 11 | laforge | h3. TV / BTX Unit |
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46 | h4. BTX decoder |
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48 | * EPROM image: attachment:bildtel001_tv10_btxdecoder_16772_074_349_27C010.bin |
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49 | 4 | laforge | |
50 | 10 | laforge | h3. Keyboard/receiver unit |
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52 | {{thumbnail(20231028_114558.jpg,size=400)}} |
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59 | 4 | laforge | |
60 | 9 | laforge | Actual Cherry keyboard PCBA after full disassembly, ultrasonic cleaning of all keycaps and lots of isopropanol on the PCB, removing what might be decades old coke residue: |
61 | {{thumbnail(20231029_093033.jpg,size=400)}} |
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63 | 12 | laforge | * EPROM image: attachment:bildtel001_keyboard_74E84.251U22g_1.0.0_010389_M2764A.bin |
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65 | 10 | laforge | h2. Connections |
66 | 1 | laforge | |
67 | 10 | laforge | h3. Codec unit |
68 | 1 | laforge | |
69 | * connects to ISDN basic-rate S0 interface using 8P8C/RJ45 plug |
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70 | * has two proprietary connectors for attaching video cameras |
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71 | * has two SCART connectors (one for audio/video output to the TV) |
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72 | * has a TAE jack for attaching an analog phone for the audio port (connected to the combined keyboard/receiver unit by default) |
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73 | * has another TAE jack (purpose unknown) |
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74 | * has a V.24 interface on a SUB-D 9 connector which connects to the built-in BTX decoder of the TV unit |
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76 | 10 | laforge | h3. TV Camera |
77 | 1 | laforge | |
78 | * connects to the Codec unit using a proprietary high-density connector that appears to carry both video and power |
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80 | 10 | laforge | h3. TV unit |
81 | 1 | laforge | |
82 | * has an RF input for TV broadcast signals (PAL) |
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83 | * has a SCART input for baseband audio/video from peripherals (like the Codec unit) |
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84 | * has a DIN speaker output for attaching an external speaker |
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85 | * has a built-in BTX decoder with |
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86 | ** an unused DIN port intended to connect to the [[DBT-03]] BTX-Modem (not used in the ISDN video application) |
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87 | ** an unused centronics port |
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88 | ** an auxiliary V.24 port on a DIN connector interfacing the SUB-D 9 of the Codec unit |
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90 | 10 | laforge | h3. Keyboard/receiver unit |
91 | 1 | laforge | |
92 | * has a cable with TAE connector attached (connects to codec unit) |
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93 | 9 | laforge | |
94 | h2. Further Reading |
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96 | * "Thread on the fediverse covering the BildTel 001":https://chaos.social/@LaF0rge/111317641831468838 |