STe booster v 1.5 36Mhz

[exxos]

You need to route the wire away from the RAM..

I do not have a picture unfortunately, but the routing is generally best to the left of the RAM, and then in front of the RAM going to the right towards the booster.. That with 33R (and assuming good 2 chip simms used) is normally fine. I have never had a issue with that setup.

If you use no resistor, you will get corruption on screen, if he used to high a value, the booster will malfunction. Generally 33R seems best.

Also if you route the wire near the RAM ( in particular if you have parity Simms) you'll also get screen and RAM corruption.. I even did a video showing this...



So if you see XXXXX on memory test, you have the wire to close to the RAM, or are using parity Simms, or you have not used the 33R resistor.

If you only have screen corruption, the wire is likely rooted to close to the video circuit (normally above the RAM area is the worst place for this corruption).

As I said previously, you cannot use the oscillator on the board.. The booster needs to be synchronised to the motherboard clock otherwise you get DMA issue (hard drive and floppy).

[nemox]

I will try it. it video to my exact problem. I am thinking some about RAM slots is very sensitive. I tried RAM with parity and without. Very similar

Thanks

[nemox]

Hi I have some progress:-)
Video and RAM is OK i try another parity RAM and look OK(RAM test HDD test.... all ok). Some RAM is sensitive some NO ( I've tried some RAM IBM some GOLDSTAR RAM and YOUR RAM and winer is noname RAM, With or without parity no effect).
Now is only FFD problem..

[nemox]

Little progres , if i remove the booster fdd is ok when the accelerator is connected to 8 or 32 mhz fdd does not work i install pull up 5x1kohm resistor to fdd. some sync problem. I think

[exxos]

when the accelerator is connected to 8 or 32 mhz fdd does not work

8Mhz shouldn't cause any issues.. I think you have a bad connection on the CPU socket.

[DoG]

Little progres , if i remove the booster fdd is ok when the accelerator is connected to 8 or 32 mhz fdd does not work i install pull up 5x1kohm resistor to fdd. some sync problem. I think

Tried attaching a 10K bussed resistor array to the 1772 databus?

[nemox]

yes this is one of my first modifications pul up 10Kohm to databus,
i have two 520 STe boards and both the same. One boards with internal blitter and second with external blitter
I still have a bad luck

[nemox]

Hi some progress, maybe.
I try add GND and 5V to booster.
On Board with external blitter on 8Mhz all OK, on 32 Mhz ACSI did't work-no detect device, FDD RAM ... ok.

On board with internal blitter still the same -on 8 or 32Mhz fdd problem and some bug in FAT table. Micro ACSI test program OK.

On board with external blitter is DMA IMP- i'm add series diode to 5V to DMA.-- nothing happens

I'll try the DMA chip slots and switch them between the boards.

[exxos]

IMP DMA should not be used with STE....

You are using the latest GAL file I posted ages ago aren't you ?

[nemox]

yes you sended me new gal, about 2 months ago
I'll try to swap the DMA between boards.