Amiga 3000 Desktop Question

[THX1138]

I know these motherboards have a processor fast slot,but if there isn't
anything plugged into this,it should revert back to the built in processor
on the mainboard...shouldn't it ?

Or is there a jumper you have to select ?

[Jope]

BRDCLK to int, QUADCLK to int, CPUCLK to int

[THX1138]

Please explain in english please..........

[RetroMan]

Originally Posted by THX1138

Please explain in english please..........

Jumper BRDCLK to int instead of ext !
Jumper QUADCLK to int instead of ext !
Jumper CPUCLK to int instead of ext !



These should be J102, J100 and J104 on the Mainboard of your A3000D

[lopos2000]

I think what Jope means is that BRDCLK (name of the jumper on your board) to INT (Internal) same with:
QUADCLK to INT (Internal)
CPUCLK to INT (Internal)

[THX1138]

Ok..........

J100 QUADCLK 1-2 int ?
J102 BRDCLK 2-3 int ?
J104 CPUCLK 1-2 int ?

Do i have to alter J103 to pins 3-4 ?

I am getting a very slow yellow flashing screen at the moment !

[RetroMan]

Hmm, J103 should allways be 3-4 AFAIR ....

[THX1138]

J103 was on pins 1-2 so i altered them to 3-4 ?

What about J101 ?

Can't actually see this on the motherboard ?

[lopos2000]

Have a look on this web site. Might be helpful.

[adolescent]

You'll also get a yellow screen on the A3000 if you don't have the daughter card plugged in.

[StrategyGamer]

Make sure you have a working keyboard plugged into the A3000D or it won't boot up.

[THX1138]

Originally Posted by adolescent

You'll also get a yellow screen on the A3000 if you don't have the daughter card plugged in.

I don't have a daughterboard for it.....but i do have a micronik busboard attached !

Anyway the busboard seems to work ok with the A3640 processor that i took out ?

[alexh]

You might want to check out the ROM jumpers.

Some A3000 owners have noted that new 3.1 ROM chips can't be run at 25 Mhz. Set the ROM speed at 16 Mhz with jumpers J150 and J151.

The A3640 has a MAPROM feature which copies the ROMS into RAM, perhaps one or more of the Jumpers is set wrong and the ROM isnt being read correctly when using the onboard 030?

Which motherboard version do you have? The Jumper Tables all are for the 313311 or Rev9 of the motherboard.

-01 is the 16MHz PAL A3000
-03 is the 25MHz PAL A3000

(I assume you've got a PAL one being in the UK)

You might like to checkout Calum Tsang's Great A3000 Hardware Guide

[alexh]

J103 in position 1-2 disables the FPU which is where it needs to be to work with an A3640

Take a look at THIS and try and reverse the process? Maybe you have a 16MHz A3k?

Good luck!

[THX1138]

Hmmm........well the processor on the motherboard says 68030\25mhz,

J151 is set to 25mhz,the motherboard is revision 9 and it is PAL with 3.1 kick roms installed.........all the jumper settings look ok !

[THX1138]

Originally Posted by alexh

J103 in position 1-2 disables the FPU which is where it needs to be to work with an A3640

Take a look at THIS and try and reverse the process? Maybe you have a 16MHz A3k?

Good luck!

Why does it say that BRDCLK should be set to int ?

[alexh]

I would GUESS that J102 BRDCLK (Motherboard Clock) is for the Amiga chipset. Because this probably needs to be the right speed always I would imagine that it needs to be INT (i.e. onboard).

With a 25MHz 040 I doubt it matters as it has the same clock speed as the mainboard (25MHz 030), however if you had a 40MHz 040 etc. it might be important to have it set to INT?

Has changing the ROM timing helped at all?

[lopos2000]

Here are all the jumper settings I've found in a A3000 Manual.

Appendix G
Jumper Settings

FUNCTION
J100 4 2-3 2-3 1-2 1-2 Quadrature Clock Phasing
J101 3 2-3 2-3 2-3 2-3 FPU Clock Source
J102 3 2-3 2-3 2-3 2-3 System Clock Source
J103 4 3-4 3-4 3-4 3-4 FPU CS/BERR
J104 3 1-2 1-2 1-2 1-2 CPU Clock Source
J151 3 2-3 2-3 1-2 1-2 ROM Timing
J152 3 2-3 2-3 1-2 1-2 ROM Timing
J180 3 2-3 2-3 2-3 2-3 A2000 ROM Compatibility Jumpers
J181 3 2-3 2-3 2-3 2-3 A2000 ROM Compatibility Jumpers
J200 3 1-2 2-3 1-2 2-3 NTSC/PAL Select
J350 3 1-2 1-2 1-2 1-2 Tick Clock Source
J351 3 2-3 2-3 2-3 2-3 Disable DF1: (1-2 to enable )
J352 3 2-3 2-3 2-3 2-3 Light Pen Source
J481 3 2-3 2-3 2-3 2-3 VDE Scan Double Only Jumper
J482 3 1-2 1-2 1-2 1-2 VDE PLL Loop Adjust
J483 3 - - - - VDE Factory Test Points
J800 3 1-2 1-2 1-2 1-2 WD33C93 Speed
J851 3 1-2 1-2 2-3 2-3 RAM Controller Speed Jumper
J852 5 4-5 4-5 4-5 4-5 -012A Ramsey only (See Notes)
J853 3 2-3 2-3 2-3 2-3 -012A Ramsey only (See Notes)

Notes:
J150,J151: ROM Timing.
The ROM timing circuit provides four different speed settings to match the output enable and access timing of the system ROMs.
To set the jumpers, determine the output enable time and access times for the ROMs you wish to use . The ROM must have lower values than for the setting you select.
System standard ROMs have Toe = 110 ns, and Teo, = 250 ns.

CLK J151 J150 Toe (min) Taco (min)
16 MHz 2-3 2-3 157 ns 250 ns
16 MHz 2-3 1-2 220 ns 312 ns
16 MHz 1-2 2-3 282 ns 375 ns
16 MHz 1-2 1-2 345 ns 437 ns
25 MHz 2-3 2-3 90 ns 160 ns
25 MHz 2-3 1-2 130 ns 200 ns
25 MHz 1-2 2-3 170 ns 240 ns
25 MHz 1-2 1-2 210 ns 280 ns

[alexh]

Erm that's the same information that has already been posted (as a link by you!) except badly formatted and with at least one typo.

I personally feel that playing with the ROM speed jumpers will offer the best chance... but I dunno.

[lopos2000]

Oh, sorry. Just found the manual and scanned the page in. Next time I'll check my brain my posting.