STBlitter Rev.A
Blitter & IDE expansion for Atari 520ST(M)
With optional 256KB ROM decoder


Download schematics and Gerbers: STBlitter_RevA.zip
Please make sure to carefully read the included readme.txt before building this board!

IDE Interface and ROM decoding is based on schematics from P.Putnik: http://atari.8bitchip.info/astide.php

 

Blitter expansion fitted, with a CF adapter directly plugged into the board. The IDE interface is not buffered so you need to use very short or no cables.

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Blitter is working:

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IDE speed at close to maximum for an 8Mhz ST, when aided by the Blitter in Hog mode.

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The board is made with through-hole component so should be quite easy to build for the DIY’er.
Biggest obstacles are desoldering the CPU from the Atari motherboard, and programming the 16V8 PLD.DSC_2971

 

Rev.A has some extra bits for testing which ended up not being necessary.

These are the schematics without the unnecessary resistor R8 and solder-jumpers SJ1 & SJ2.

STBlitter_RevB_sch