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a8isa1's Photo


Member Since 15 Apr 2006
OFFLINE Last Active Today, 1:57 AM

Posts I've Made

In Topic: PLATOTerm for Atari 8-bit, Alpha Release

Yesterday, 7:11 PM

I also connected using R-verter driver plus nodeMCU board running Zimodem 3.4 firmware.


However, this will be my last test unless/until I fix my s-video cable.


This is my first time connecting to a PLATO "network" with my Atari.   Thank you!



In Topic: Images generated by RastaConverter

Sat Aug 11, 2018 4:08 PM

Thanks but my 800XL is out of adjustment.  I could never get it (along with my scan converter) to line up with any palettes available for Rastaconverter. I had to come up with my own palette.


After I last posted I remembered that my scan converter does reasonably well with PAL images if I shift the hue 3 steps to the left.  

In Topic: Images generated by RastaConverter

Thu Aug 9, 2018 11:41 AM

Love these car art pics!  They are making me wish (once again) I owned a PAL A8 setup.


Great conversions as usual.

In Topic: Scramble (5200 Conversion)

Tue Aug 7, 2018 11:56 AM

Reading the history of the Scramble coin-op - it says it does use (or should I say reuse?) Galaxian hardware - which would explain why it uses a vertical monitor.  You would guess extra chips would be in use - to say enable scrolling? and to add the needed landscape. (This was not the first game to have a proper scrolling landscape?)

Atari 8-bit computer users should not download the hacked 5200 version - at the top of the page - but download instead the official version - which is 1/2 way down the page - and get hold of a Genesis/MegaDrive gamepad - so that you can use two fire buttons - as per the coin-op.  Or put such a gamepad on their shopping list.  Hopefully more and more programmers would start using this nice gamepad - and hackers could hack older games which would benefit from using it.


I don't know you'd prefer using Z and X keys - whereas the Genesis gamepad seems to be the far better option?




If I wanted to modify an Atari joystick with a second button I'm assuming it would be connected to Paddle 0 pin.  


What value pullup should be used?

In Topic: I2C interfacing with 8-bit(s)

Tue Jul 31, 2018 4:23 PM





I started with PCF8574 (Remote 8-Bit I/O Expander for I 2 C Bus) - very popular in the eBay market as completely assembled module. I wrote software which can write and read values to/from PCF8574 register just only for test but I've idea to write driver for LCD display (with HD44780 controller). We may use any I2C device like Bosh BHT280 in order to read temperature, pressure and others... can imagine?  :-)






Yes, I can imagine.   The DS3231 has a temperature sensor built into it but since the module is inside my 800XL it normally reads 90 Degrees F.


I can plug another module into a joystick port and place the module in more useful place for measuring temperature