GBA1000 rev4 Build Log

[Tuxbar81]

@Ordine: Great job. I'm happy for you!
Me I have always two problems. The first one is the CPU clock... 13.40MHz... At this time, I don't find the origin of the problem.

The second problem is the Fast RAM which isn't reconized. Always 0M... I have verified all solders of all RAM ICs and also of IC60.
The IC60 must be programmed to allow the access of the Fast memory?
If it's not programmed, that should be possible to activate the memory with addmem command, no?
Perhaps there is an issue with GAL ICs. (not well programmed).

Interested in any suggestion!

 

[Ordyne]

You will still see the fast ram without having the tsop programmed, it will just not be in 32bit address space. I would check you don't have a solder bridge under one of your fast rams!

Not sure what to suggest regarding the clock frequency unless both issues are related in some strange way.


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[HiMark]

...and he also offered soldering of TSOP, I should have read a bit before ordering :banghead:
well maybe I find schematics somewhere...

thanks for info!

 

[Ordyne]

The tsop is probably easier to solder than the fast ram IMO, are you in the UK? If you are I could solder it on for you.


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[HiMark]

norby in post #144 wrote the board is showing RAM in banks of 4 chips (for example IC74-77), try closer inspection of those, that's only quarter of the original job :razz:
maybe someone with functioning BGA board could swap the GAL (IC60) with empty one to see if he gets the same result (0MB)?

- - - Updated - - -
post #244
unfortunatley I live in Poland :smile: but thanks for your proposal. I think the board should work even without the TSOP (fast in 24bit mode)?

 

[Ordyne]

Yes it should do


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[Tuxbar81]

You will still see the fast ram without having the tsop programmed, it will just not be in 32bit address space. I would check you don't have a solder bridge under one of your fast rams!

This is what I had understood. Thanks a lot for the confirmation!
I'm going to control again all solder of the Fast RAM this evening.

 

[cpiace64]

You will still see the fast ram without having the tsop programmed, it will just not be in 32bit address space. I would check you don't have a solder bridge under one of your fast rams!

This is what I had understood. Thanks a lot for the confirmation!
I'm going to control again all solder of the Fast RAM this evening.

have you insert jumper S7 near zorro2 and xtal 28.xxx?
without jumper need addram at address 1200000-19FFFFF

 

[cpiace64]

yesterday i have rewryte some gal and the card boot, today i have verified some chip near ide and now the zorro2 don't go, i have lost the fastram and all card inserted in the zorro2 don't go

in the early startup, expansion "none"

 

[Tuxbar81]

You will still see the fast ram without having the tsop programmed, it will just not be in 32bit address space. I would check you don't have a solder bridge under one of your fast rams!

This is what I had understood. Thanks a lot for the confirmation!
I'm going to control again all solder of the Fast RAM this evening.

have you insert jumper S7 near zorro2 and xtal 28.xxx?
without jumper need addram at address 1200000-19FFFFF

I have controlled all solders of Fast RAM, and I have tested all lines to be sure that there is no short circuit. Cool, everything is OK!
But... no Fast RAM... and I have took a look at the S7 jumper. Onto the manual it's noticed that it's for ZORRO II Slot. (chapter 4.1.4)
Nothing about Fast Ram. Strange... So, looked at the schematics, and yes, the S7 jumper is for ZORRO II and is also connected to LSI1024!

So, I closed S7 and switched on my GBA... Hummm... how I could say...YEEEEESSSSSSSSSS, the workbench is launched with 2M of Chip Ram and 8M of Fast Ram! Actually in 24Bit space. I change to 32Bit tomorrow, now dodo... sorry... go to sleep!

Yes, but I had also a problem with the CPU Clock. (13.40MHz instead of 50MHz) And, perhaps it's just a sensation, but the system is launched really faster.
Hop, test with SYSINFO... TADAAAAAAA! 51.80MHz! It's stange no?! S7 opened: 13.40MHz.... S7 closed: 51.80MHz... Somebody can test onto his GBA to see if it's the same result?

SYSINFO screen here:



SO, piacc64, MEGA Thanks! I was really stuck!

Somebody has tested the ZORRO II slot? Because the manual says:
"If the jumper S7 is closed and an expansion card is plugged into the ZORRO II slot, the
configuration signals of the expansion card will be suppressed, the expansion card will
not be recognized and it may be damaged."

So, if we put a ZORRO II card into the slot, we have to remove S7... and in that case, what hapen to the Fast Ram?!

- - - Updated - - -

yesterday i have rewryte some gal and the card boot, today i have verified some chip near ide and now the zorro2 don't go, i have lost the fastram and all card inserted in the zorro2 don't go

in the early startup, expansion "none"

Between yesterday and today, you have removed and put back chips? You didn't invert two of them?

 

[cpiace64]

my mistake, i have removed for test R136, this Resistor enable the zorro2

- - - Updated - - -

my board work at 40mhz and without fastram sysinfo report 12.90mhz

same with a1200 with 1230 without fastram, is a bug of sysinfo

 

[cpiace64]

i tested all ide gal and chip, but don't go

 

[Tuxbar81]

i tested all ide gal and chip, but don't go

Your GBA doesn't boot onto the internal IDE device?
R136 is present onto your board. If no, the jumper just near must be closed to activate the IDE device.

 

[cpiace64]

the ide don't read

now i suppose don't read the eprom, need verify all connection

 

[Tuxbar81]

Just for fun... My GBA1000 under Workbench 3.9!
Cool, but really need a graphic board!!

 

[Ordyne]

Just for fun... My GBA1000 under Workbench 3.9!
Cool, but really need a graphic board!!

Cool! Yeah RTG, Networking and more fast ram would be nice!



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[BloodyCactus]

I did a rough pricing of GB's USB thylacine pcb, was I think OSHPark said $100 for 3 boards, without parts. Think I'll wait until my GBA1000 mobo is complete first

 

[Tuxbar81]

Yes, I had looked also at the price for the mini-thylacine PCB. It's a little expensive for a batch of 3 PCBs. It's a 4 layers board, and the price is $10 / inch². For this price, Oshpark makes 3 PCBs.

But, if there is enough people interested, for a batch of a minimum of 15 PCBs, the price will be $2 / inch². With 15 PCBs minimum, the surface will be over 150 inch².
I have made like that for the Amiga 1000 Automatic Kickstart Switcher. It's a very interesting solution!

I had made also tests for the 68060 accelerator board and the Picasso graphic board!

 

[ajk]

I am sure you will find interest for 15 boards of any of these. Just start a new thread when you are getting close to actually ordering

 

[Ordyne]

I'd be up for it!


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