Bulletins from the Pacific Packet Radio Society - page 044

* Two independent, 0 to 1M bit/second, full-duplex channels, each with a separate crystal oscillator, baud rate generator, and digital phase-locked loop for clock recovery.

* Multi-protocol operation under program control; programmable for NRZ, NRZI, or FM data encoding.

* Asynchronous mode with five to eight bits and one, one and one-half, or two stop bits per character; programmable clock factor; break detection and generation; parity overrun, and framing error detection.

* Synchronous mode with internal or external character synchronization on one or two synchronous characters and CRC generation and checking with CRC-16 or CRC-CCITT preset to either 1s or 0s.

* SDLC/HDLC mode with comprehensive frame-level control, automatic zero insertion and deletion, I-field residue handling, abort generation and detection, CRC generation and checking, and SDLC loop mode operation.

* Local loopback and auto-echo modes.

* Z-bus daisy chain interrupt hierarchy is supported.

* Z8530-PS is 40-pin plastic package, single +5 volts required. 1-9 = $53-70, 10-99 = $44.80

The price may seem high until you consider that this one part can replace the 8273, 8250 and 4024 on the VADCG, or is the equivalent to two 8273s in gateway service. The part uses a non-multiplexed bus, has full DMA control, and should work well with many popular 8 and 16 bit microprocessors. There are three bytes of receive FIFO, software changeable Baud rates, many options for clocking, and even a method for handling Manchester encoding! Programming this thing won't be particularly easy, but shouldn't be much more difficult than the Z80/SIO or the 8274. The product specification is quite complete, and I advise all you circuit designers to have a look.

73, Hank



To: Hank
From: Den

I received the manual this afternoon, and will no longer be sending you copy with errors!

On installing components in the TAPR board, we have found a few problems:

there is one line shorted to a connector pin (easily fixed) .several components are closer to each other than they have to be one component ( the crystal ) shorts out a resistor if pushed too far onto the board a capacitor prevents,a voltage regulator from being inserted into its holes

Nothing bad enough to prevent the boards from working, but we will be reshooting the board as soon as it tests out.

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