ST-DMA Converter - Turn your BAD DMA into Good DMA

*Shipment to United States is resumed:

Now European courier shipment meets the requirements of Executive Order 14324, which requires the seller to declare the goods as commercial merchandise, collect import taxes, and submit them to U.S. Customs and Border Protection.

But the shipment is obviously more expensive, but it includes all U.S. customs taxes and the additional cost of processing a shipment as commercial merchandise, as required by current U.S. law.*

#### What is it?

This board helps users suffering from bad DMA

issues, that corrupt hard disk contents at write.

This PCB converts a C025913-38 DMA chip to a C398739-001A DMA chip

#### Installation

The PCB is designed to extract your current

DMA chip, and place it over this PCB.

As well, the PCB can be installed in an easier way,

this PCB can be installed on top of the DMA chip,

Look at the photo galery, thrid photograph corresponds

to this installation method

According to the question of an user and the answer

of of this solution developer (12 MHz) :

Cwiss user ask:

presumably you could just solder it on top of the DMA chip instead? Is there any reason not to do that?

12 MHz answer:

A very unusual idea. :D

But yes, it will also work that way.

You can solder the DMA-Changer on top of the DMA-chip.

The pins must be connected 1 to 1.

#### Why did you make it?

Some of these were manufactured to help users

of the hard disk unit, whose ST/E cmputers are suffering

from bad DMA chip (C025913-38).

Using this PCB, the issues are solved for these users.

After the initial manufacturing, some boards and components

remained, and more units can be manufactured.

#### What makes it special?

Now, the main reason of the Bad DMA issue arises to surface,

thanks to the research performed by R^2 , 12 MHz

With this device, which can be soldered over your current

DMA chip, you can solve Bad DMA issues without need to replace

your DMA chip.

#### Research documentation

https://www.chzsoft.de/site/hardware/new-atari-ste-bad-dma-investigation/

#### Device documentation

https://forum.atari-home.de/index.php?PHPSESSID=fo858e9ckuergah4cea687u1sn&action=dlattach;topic=17461.0;attach=33532

#### Autor of this solution

R^2 , 12 MHz