exxos's Atari, Amiga & retro forum

Forgottenmyname wrote: 09 Nov 2018 20:37 Just resoldering the two sets of pins on the STF and will retry, will post the diagrom details if still no luck :)

Must be the address pins. with those data pins shorted/missing nothing would boot.

Ok, so here's what I get on the Diagrom

▒▒▒U

Garbage before this text was binary numbers: 1, 2, 4, 8, 16, 32, 64, 128, 240, 15, 170 and 85
To help you find biterrors to the mfp. Now starting normal startuptext etc
Atari DiagROM V0.9 - 19-Sep-18
- By Stephen J. Leary
- Based on the Amiga Version By John (Chucky/The Gang) Hertell

- Parallel Code $ff - Start of ROM, CPU Seems somewhat alive
- Resetting all hardware (RESET instruction): Done.
- Reinitialising Video ($10000): Done.
- Sending reset to keyboard controller (IKBD Reset): Done.
- Parallel Code $fe - Test UDS/LDS line
- Test of writing word $FFFF to $400 OK.
- Test of writing word $00FF to $400 OK.
- Test of writing word $FF00 to $400 OK.
- Test of writing word $0000 to $400 OK.
- Test of writing byte (even) $ff to $400 OK.
- Test of writing byte (odd) $ff to $401 OK.
- Parallel Code $fd - Start of chipmemdetection
- Performing MMU Configuration: $00 Done.

Addr $00020400 OK Number of 32K blocks found: $04
Startaddr: $00000400 Endaddr: $00020000
- Parallel Code $fb - Memorydetection done
- Parallel Code $fc - Start of motherboard fastmemdetection
- Parallel Code $fb - Memorydetection done
- Parallel Code $fb - Memorydetection done
DDDDFF

DD11m m

I think you are right about a bad connection as I've been over the solder joints and now 3 of the stuck bits have disappeared when using the atari cart.

Ok, tip for today.... never try to show off, even if it's just to yourself and solder SOJ20 chips with a soldering iron, when you should do it with hot air...... That is all :)

I am extremely proud to announce the return of my STF to the land of the living.

It'll now happily boot to desktop, although when I try anything diskwise it comes up with 11 bombs.....

Still, one step in the right direction and have learned so very much whilst trying to get it to come back to life.

I think the problems have all been related to sockets, yes that dreaded S word that we all hate so much. Having now removed the 4mb MMU ram expansion and using a falcon board has really helped, so I would recommend to use a falcon board as an easier and less troublesome option whilst using the Alpha Board.

Means my 4mb can now go back into one of my Megas where it belongs :)

Anyone any ideas now for 11 bombs Line 1111 emulation?

P.s. thanks to you all for your help and encouragement.

:bravo:

I would suggest you run YAART for a couple hours and make sure things are stable...

I never seen a row of bombs on DMA access before.. might be worth cleaning the ROM and GLUE contacts...

Will give that a try with some IPA and see if I can get the floppy to work.

Just need to get Yaart onto a floppy as well.

Forgottenmyname wrote: 09 Nov 2018 20:57

Addr $00020400 OK Number of 32K blocks found: $04
Startaddr: $00000400 Endaddr: $00020000
- Parallel Code $fb - Memorydetection done
- Parallel Code $fc - Start of motherboard fastmemdetection
- Parallel Code $fb - Memorydetection done
- Parallel Code $fb - Memorydetection done
DDDDFF

DD11m m

I think you are right about a bad connection as I've been over the solder joints and now 3 of the stuck bits have disappeared when using the atari cart.

Excellent. Tip here is that it only detected 128K of ram (4 blocks of 32K) So it seemed to have been looping over the same ram over and over.

Glad DiagROM was able to help

Ok that makes sense. Thanks for the tip TF.

Learning something new every day.

Forgottenmyname wrote: 09 Nov 2018 22:59 Will give that a try with some IPA and see if I can get the floppy to work.

Just need to get Yaart onto a floppy as well.

Not sure if you saw, my post on fixing my floppy issue with board #1. It was a faulty YM2149 chip. When I replaced it, the floppy was recognised and worked fine.

kodak80 wrote: 30 Nov 2018 08:29

Forgottenmyname wrote: 09 Nov 2018 22:59 Will give that a try with some IPA and see if I can get the floppy to work.

Just need to get Yaart onto a floppy as well.

Not sure if you saw, my post on fixing my floppy issue with board #1. It was a faulty YM2149 chip. When I replaced it, the floppy was recognised and worked fine.

Hi Kodak, yes I did see it. Mine is slightly different. It detects the floppy no problem but if a disk is in the drive I get 2, 3, 8 or 11 bombs on start-up. And putting the disk in at the desktop died 8 or 11 bombs. I think mine is likely a bad socket or two.

Thanks for the suggestion though.