Sold GVP IO Extender Rev 6

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A10001986

A10001986

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For sale is a GVP I/O Extender Rev 6 (the "full" version, not the cost-reduced one) with manual and original disk.

For specs and software go to:
http://amiga.resource.cx/exp/ioextender

Images of actual items, taken today:
IMG_4318_1.jpgIMG_4319_1.jpgIMG_4317_1.jpgIMG_4316_1.jpg

Card was tested, but only the parallel port. Due to a lack of serial devices I could not test the serial ports. Supplied is also a Delock 89353 cable with plug which *should* match the pinout of the second serial port ("twisted": 1-1, 6-2, 2-3, 7-4, 3-5, 8-6, 4-7, 9-8, 5-9). However, please check this again before using the port.

Edit: This card requires a C-MOS/TTL oscillator at U9 for serial operation. If MIDI is to be used (which requires the additional GVP MIDI kit, which is not within the scope of this offer, and which I don't have), this has to be a 7.372800MHz one, otherwise the value may vary, but needs to be configured using the DUARTCLOCK tooltype of the gvpio icon in the Expansion drawer. Suitable oscillators cost around 1 EUR and are available easily (eg for Germany: Reichelt.de "OSZI 7,372800").

Price: 50 EUR plus shipping.

Shipping inside EU only. Please ask for shipping quote.

Payment per Paypal only, no deduction (ie buyer pays eventual fees).

Private sale. No guarantee, no refund, no returns.
 
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Some boards had socketed clock components, others later on didn't. The board's oscillator frequency matters most when it comes to MIDI, otherwise the default 7.xxx oscillator component isn't 'critical'. I believe there's a ToolType in the expansion drawer icon to define the frequency for the driver to best calculate baud rates.

My prototype board actually has a 20Mhz oscillator on it, and it always ran at 115200 locked back in the day on the BBS I ran with a USR V.Everything 56K. I recall that higher frequency clocks can help it with higher baud rates (accelerators are also important at the higher rates, too, to timely address the board's interrupt service requests).

FYI - The board's VL16C552 is a standard 16550-class chip, and I can't recall of modern, high speed serial port frying (back in the day, no I/O extenders ever got returned for warranty issues). One could open 2 terminal programs, point one to gvpser.devcie port 0, and another to port 1, connect a 9-pin null modem and a short serial cable between them, and test.
 
There is a socket. In the meantime, I sourced a proper 7.372800 MHz oscillator which would be included.
 
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