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ISDN-Controller T1 ISA Link

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ISDN-Controller T1-Image3.png
Screenshot english T1/T1-B PDF (C) AVM GmbH


The ISDN-Controller T1 ISA Link is a ISA card to connect the ISDN-Controller T1 or ISDN-Controller T1-B to a PC using a 20 Mbps RS422 serial link. This card was developed by Hema Electronic GmbH and its called Hema TA2. The PCB is labeled Hema TA2C. An alternative card for the PCI bus is the ISDN-Controller T1 PCI Link.


GeekDot has a nice article about this card. (english)
Lab@Home has an excellent T1-B research article also covering this card. (german)

Daily updated index of all ISDN-Controller T1 ISA Link websites. Last update: 2020-12-02 04:01 GMT.

Legend:   on = live URL.   -   host = hosted here.   -   arc = from archive.org.   -   nonpub = non public.   -   dead = dead link.   -   Bold = service portal.


Daily updated index of all ISDN-Controller T1 ISA Link downloads. Last update: 2020-12-02 04:53 GMT.

Legend:   on = live URL.   -   host = hosted here.   -   arc = from archive.org.   -   nonpub = non public.   -   dead = dead link.   -   Bold = latest firmware.


Daily updated index of ISDN-Controller T1 ISA Link part numbers. Last update: 2020-12-02 04:31 GMT. Click an EAN/GTIN or MPN to search the web for it.
If you know any part numbers not listed here yet, expecially OEM and country specific versions, then please get in touch.

Legend:   ok = supported   -   eos = EOS   -   sold = still sold   -   dead = not sold any more   -   Bold = maintained Icecat entry   -   Italic = logistic entry without datasheet


Selectors >> PSU-Selector >> ISDN-Controller T1 ISA Link   -   Showing recommended Power-Supply units.

PSU-Selector Type L. Min Max In Min Max Max Max Out Out Curr Pwr Out2 Out2 Curr2 Pwr2 Cap. Vend. Nick Alias
0 power supply units

Selectors >> Cable+Adapter-Selector >> ISDN-Controller T1 ISA Link   -   Showing recommended Cables+Adapters.

Cable+Adapter-Selector Type Length Wires Shield Conn1 Gender Conn2 Gender Conn3 Gender Conn4 Gender
0 cables and adapters


This card is not intentionally built for the T1 or T1-B but as a universal Inmos Transputer development card. The PCB provides 4 TRAM sockets. A TRAM is a Transputer module with RAM. Transputers can easily be clustered by a 2 wire link using the Inmos Link Protocol at typical rates of 5/10/20MBps. This card provides a PC interface to 4 of these links. For longer distances 2 external RS422 interfaces are provided, as used for the T1/T1-B. If the socketed RS422 transceivers are removed 2 TTL interfaces could be used instead.


If you want to extend the gallery with own work then please get in touch. See also the Photography-Inspiration article.


The Versions section intends to compare different hardware revisions of a device.
If you could provide images of a revision not listet here yet then please get in touch.

  • TODO


Slot plate:

  • RS422 - DSUB-15 - 20 Mbps link to connect the T1/T1-B - First T1???
  • RS422 - DSUB-15 - 20 Mbps link to connect the T1/T1-B - Second T1???

Bus connector:


  • TODO


Selectors >> Components-Selector >> ISDN-Controller T1 ISA Link   -   Chips may occur multiple times if different types were found in probes.

Cat. Qty. Component Purpose Family Coden. Vendor Description
RAM 2x CY7C433-30JC FIFO-4K CY7C4xx Cypress 4K x 9 Asynchronous FIFO = 4KB
FPGA 1x XC3030A FPGA XC3000 Xilinx 2500 Logic Gates FPGA
FPGA 1x MACH210-15JC PAL Lattice 44-Pin EE Programmable Array Logic
FPGA 1x PALCE22V10Q-25JC4 PAL PALCE22V10 AMD 24-Pin EE Programmable Array Logic
Misc 1x IMSC012-P20S Bus-Iface IMSCO1x ST Host Bus to Inmos Serial Link Adapter
Misc 1x IMSC011-P20S Bus-Iface IMSCO1x ST 8-Bit Bus to Inmos Serial Link Adapter
Misc 3x SN74HCT04 Logic 7404 TI Hex Inverters
Misc 1x 74ACT521 Logic 74521 ON Semi 8-Bit Identity Comparator
Misc 6x DS8921AN RS-422 DS8921x TI Differential Line Driver and Receiver Pair

TODO: Property:CY7C433-30JC OR Property:XC3030A OR Property:MACH210-15JC OR Property:PALCE22V10Q-25JC4 OR Property:IMSC011-P20S OR Property:IMSC012-P20S OR Property:DS8921AN OR Property:SN74HCT04 OR Property:74ACT521 OR Property:logic OR Property:bus-drv