SX Blitz help required

[CalmBSK]

As you can tell from the subject I'm having probs with my SX Blitz programmer, I'm unable to get my pc to recognise that the blitz is connected.

I originally bought it in haste not really having a clue how to use it.
Typical me, jump right in an work it out as I go along (or try to work it out in this case!)

So far I have connected +5v (pins 2 & 28) of a SX28AC/DP chip to +5v on a v3 ps2. Then Ground (pin 4) to Ground on the PS2.
Then I've connected OSC1 of the Blitz (via theheader pins) to pin 27 and OSC2 to pin 26. Then VDD of the Blitz to +5v on the PS2 board at the same point as the SX chip conects and VSS goes to Ground on the PS2 board, again same point as the SX chip connects. No other pins on the chip are connected to the board and no other components are connected to the chip.

I have no real idea if this is correct.
I've worked this out from the few posts on the blitz I have found here and 3 photos I have found on a website. (thanks for those Crackerjack )

My problem is that no software can find the blitz on either com 1 or 2. I've tried ICPROG, ProgSX and SX-Blitz's own. I know +5 is getting through to the header pins as I've checked vi the solder point on the blitz just next to the VDD text,

Can anyone confirm that I have this set up corretly? Am I missing some thing or am I totally on the wrong track?

Sorry for such a long message but wanted to get in as much info as I could for anyone who may be kind enough to offer assistance

[S-Mario]

Try set the voltage to 4-4.5 volt that helped me then my software couldnt find the blitz.

Im using SX-Key v2.0 Beta Software, dont think you can use ic-prog with blitz.

[CalmBSK]

thanks S-Mario, i'll give it a try

[maltloaf]

i use a 5v regulated supply with my blitz and the only problem i have ever had is "chip connection failed" when i get a poor connection osc1 and osc2 (using sxkey soft)

[maltloaf]

is your pc comm port set up ok ?

[CalmBSK]

hi maltloaf, thanks for the advice.

I've tried using the ps2 +5v as i mentioned in my original post, and I've tried connecting it to a regulated +5v source but no luck.

I get the impression that either the blitz was originally dead or I have somehow killed it attempting to get it to work.

I don't see how I've killed it as I only connected it once everything else was done but you never know.

I'll have to take off the plastic protection and try and check the components that I can get to.

Any chance you could describe how you have set yours up. Do you use a serial extension cable? Am I correct with the pin numbers that I have connected to? Details like that would at least confirm that I am doing the right thing.

cheers.

[maltloaf]

you need just 4 connections to program the chip as you have described...

OSC1 on blitz goes to pin 27 on SX
OSC2 on blitz goes to pin 26 on SX
Vdd on blitz goes to pin 2 on SX
Vss on blitz goes to pin 4 on SX

you also need to connect pin 28 to pin 2 (mclr to Vdd) on the SX

I have a ZIF socket on a prototype board that i use to program blank chips, wired as above.

For in circuit programming, i always take the +v and gnd wires that power the chip and desolder them from the ps2 completely and just route them to the programmer/external supply.

Osc 1 and 2 just have flying leads which I solder on and in some cases leave on even when the ps2 is fully modded. Each of these 4 wires are around 30cm in length while programming I would say.

thanks,

malt

[CalmBSK]

Maltloaf, thanks alot for all your help, it's really appreciated

I'll recheck all my connections tonight and give it all another go