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Forums > Tandy Model 100/102/200 > Peripherals > Tandy WP-2 WP2 TTL Serial Modification
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techie_alison
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Registered: 6/10/2009    Warnings: 0
Tandy WP-2 WP2 TTL Serial Modification
OK, so I didn't really want to hack up my NEC PC8201A and modify it too much beyond standard. Soooo, I did it to a Tandy WP-2 instead.

It has an 8-pin DIN on the back which routes out the cassette lines, and seeing as I'm not likely to use this facility, I disconnected these. And then I wired the DIN up to the serial port itself BEFORE the line drivers. It works.

I'm now connecting the WP2 directly to my PIC/DSPIC microcontroller circuits. Which was to be the original intention with the NEC. In all honesty, this WP2 is less power hungry, smaller, lighter, and more of a throw away item. They're on eBay regularly for say £10 tops, where as the NECs are highly sought after, going for £50+.

A few points to note about the WP2 :
* RTS/CTS (pins 7 and 8) need to be tied, else it won't transmit. There's no facility in software for plain RX/TX Three Line communication.
* The WP2 maintains a bastardised subset of the VT52 terminal standard. Not all escape codes are recognised. To clear the entire screen requires a HOME-CLEAR TO END-HOME sequence. NO VT100 codes are recognised.
* The WP2 is only capable of a maximum of 9600bps and is not particularly configurable. The NEC in comparison is more mature in computer engineering terms.

A few VT52 Escape Codes : http://www.3waylabs.com/nw/WWW/products/wizcon/vt52.html

And now for the pictures thus far :











The larger images (1280x960) can be seen by visiting my Flickr page directly : http://www.flickr.com/photos/old_computers . OR, by clicking on the images above, ...which will open in a fresh window.

A few more pictures are to follow of the actual finished modification, and a few of the VT52 Escape Codes that I'm using.

Additional pictures as promised :











The chip up above is an addition from standard. It's a 1Mbit (128Kbyte) SRAM chip which enables a 128K backed up ramdisk.

Most of the images are pretty self explanatory. The underside of the PCB where the two pins are shorted are the CTS/RTS lines, pins 7 and 8. This is mentioned up above.

The final image shows the WP2 connected directly to the UART of a Microchip 16F628A microcontroller. It's as simple as that. No messing about with MAX232/233 chips, no messing about with powering the MAX232 and wiring it in/smoothing the PSU. Just connect it up and go.

This is obviously non-standard and intended for a development environment, where you wish to spend most of your time developing, and NOT trying to get your RS232 terminal working properly. That's always the problem, ...you get side tracked from what you're doing.





(Last edit:: 6/27/2009 16:47)
6/27/2009 05:32 Link - Ip: Logged - Quote:
king
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2/6/2018 23:44 Link - Ip: Logged - Quote:
Forums > Tandy Model 100/102/200 > Peripherals > Tandy WP-2 WP2 TTL Serial Modification

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