Geekdot at 09:03, 3 November 2025

2025-11-03T09:03:27Z

← Older revision		Revision as of 11:03, 3 November 2025
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	[[Category:ATW800/2]]		[[Category:ATW800/2]]
			Depending on the revision of your card there are two ways to connect external Transputer(s)

	The ~~external buffered interface is~~ not fitted by default. The buffering of the external link interface allows longer cables to an external Transputer farm (max. 2 meters).		=== Mk3 V1.0d ===
			The first 50 ATW800/2 had a prerequisite for adding an optional buffer to the card but it's not fitted by default. The buffering of the external link interface allows longer cables to an external Transputer farm (max. 2 meters).

	To use it you will need to add some extra components to the bottom side of the card:		To use it you will need to add some extra components to the bottom side of the card:
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	* Reset		* Reset
	* Error		* Error

			=== Mk3 V1.1 and later cards ===
			Later cards just offer a simple, straight link connection to the outside. Still, a 2x6 90° Pinheader needs to be retrofitted to the edge of the card.<br>
			To this you can either connect more Transputer(s) e.g. on a simple TRAM carrier directly (cable < 10cm) or a small external PCB containing some sort of buffer. We will provide schematics for these soon.

Geekdot: Created page with "Category:ATW800/2 The external buffered interface is not fitted by default. The buffering of the external link interface allows longer cables to an external Transputer farm (max. 2 meters). To use it you will need to add some extra components to the bottom side of the card: * one 5V, TSOP48, 74xx162245 buffer (IC5) * 4x 0603 100nF caps (C19/21/22/23) * 2x6 90° Pinheader to the edge of the card * a 10k resistor * a shottky diode Due to a f-up by the idiot who d..."

2025-05-17T13:13:48Z

Created page with "Category:ATW800/2 The external buffered interface is not fitted by default. The buffering of the external link interface allows longer cables to an external Transputer farm (max. 2 meters). To use it you will need to add some extra components to the bottom side of the card: * one 5V, TSOP48, 74xx162245 buffer (IC5) * 4x 0603 100nF caps (C19/21/22/23) * 2x6 90° Pinheader to the edge of the card * a 10k resistor * a shottky diode Due to a f-up by the idiot who d..."

New page

[[Category:ATW800/2]]

The external buffered interface is not fitted by default. The buffering of the external link interface allows longer cables to an external Transputer farm (max. 2 meters).

To use it you will need to add some extra components to the bottom side of the card:

* one 5V, TSOP48, 74xx162245 buffer (IC5)
* 4x 0603 100nF caps (C19/21/22/23)
* 2x6 90° Pinheader to the edge of the card
* a 10k resistor
* a shottky diode

Due to a f-up by the idiot who designed the card (forgot his name), you need to do some fixing:

* Do not solder '''pin 32''' of the 74xx162245 to the PCB but lift it a bit upwards from the PCB (BLUE ARROW)
* (optional but recommended) cut the trace leading to pin 32 (RED mark)
* Solder the resistor and the diode in parallel to the "ERROR" pin of the nearby TRAM socket. (YELLOW mark)
* The cathode (that's the end normally marked with a white stripe) of the diode need to be connected ''towards pin 32'' of the buffer

This solder stunt is not for the fainthearted - don't drink too much coffee before doing this. Shaky hands won't help here.
A microscope will help ''dramatically'' and you might need a ''very'' thin wire to be soldered to that pin.

Here's a piccy of the whereabouts...
[attachment=0]External-Fix.jpg[/attachment]

Sorry for this, but I was assuming that out of the 50 1st batch owners 1 or max. 2 will actually own an external Transputer farm to be attached to the ATW800/2.

==== A simpler solution ====

Another more crude but simpler solution would be to directly connect an external TRAM to the TRAM socket of the ATW800/2.
The cable would be limited to roughly 30-50cm but all you'd need would be 5 cables (given there's external 5V provided):
* Link0 in
* Link0 out
* Analyze
* Reset
* Error

External Link interface - Revision history

Geekdot at 09:03, 3 November 2025