New A4000 motherboard - little help.

gary2000 · 16 January 2020, 22:57

This is where I'm at, at this point:

Replaced PAL U714 which corrected zorro II problem.

With diagrom, CPU okay, chip RAM tested okay, fast RAM ok, all video and audio tests okay, IRQ/CIA okay, zorro II detected ram card, IDE detected correctly, floppy drive seen.

With 3.0 roms will not boot, resets, and then stops after screen turns on.
OVL = L with diagrom and H with 3.0 rom, is that normal?
Anyone have any other suggestions to check for?
Are 3.1 roms available for download to burn for me to purchase? I do not want 3.1.4 at this time for testing.

dalek · 20 January 2020, 12:44

Do you get the early boot screen if you hold down both mouse buttons?

Is that an 060 in an adaptor in there, or an 040 (can't quite see from the pic)? KS 3.0/3.1 won't start with an 060 on an A3640 without a modified exec.library in rom.

gary2000 · 24 January 2020, 04:48

no boot screen. 040

Hewitson · 24 January 2020, 11:34

Quote:

Originally Posted by gary2000

Are 3.1 roms available for download to burn for me to purchase? I do not want 3.1.4 at this time for testing.

3.1 roms are freely available on the web. Don't waste your money on purchasing them.

gary2000 · 03 February 2020, 01:02

The only issue I had with running diagrom was a vertical hold problem rolling screen.

Could someone tell me the in-circuit value of R514, which shows 10K? Mine is 3K or 4.5K without resistor, and this does not seem normal.

gary2000 · 16 February 2020, 02:09

Well, it finally booted to Kick start screen!

The Commodore roms went bad, which was surprising.

One issue other than the occasional yellow screen, is when you put in a disk OVL is held high. You must turn off and turn on again for the high to low to happen. Has anyone seen this happen?

Most games will not fully load and there is graphical corruption when trying, but work bench will load fine.

gary2000 · 20 March 2020, 00:35

Mostly working at this point, but I have the following issues:

When selecting from Gotek, you have to manually turn off the power and turn on to reboot instead of warm restart.

Fast RAM 4MB shows as 1 - I believe this has to do with the power supply _fail + 5 V as shown in other posts.

Only Gotek works as DF0 and original floppy is unstable and does not load much. All jumpers were set correctly.

Sysinfo reports and ECS Agnus instead of Alice AGA. It also shows 25 mhz as 030, even though it is an 040. It sometimes reports as 16 mhz, also using Sysinfo 4.3.

Some games work perfectly and some crash. Workbench loads ok. Any ideas on these issues?

16 January 2020, 22:57	#1
gary2000 Registered User Join Date: Jan 2020 Location: USA Posts: 5	New A4000 motherboard - little help. This is where I'm at, at this point: Replaced PAL U714 which corrected zorro II problem. With diagrom, CPU okay, chip RAM tested okay, fast RAM ok, all video and audio tests okay, IRQ/CIA okay, zorro II detected ram card, IDE detected correctly, floppy drive seen. With 3.0 roms will not boot, resets, and then stops after screen turns on. OVL = L with diagrom and H with 3.0 rom, is that normal? Anyone have any other suggestions to check for? Are 3.1 roms available for download to burn for me to purchase? I do not want 3.1.4 at this time for testing. Attached Thumbnails Last edited by gary2000; 18 January 2020 at 01:34. Reason: adding picture

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20 January 2020, 12:44	#2
dalek Registered User Join Date: Nov 2014 Location: NSW/Australia Posts: 462	Do you get the early boot screen if you hold down both mouse buttons? Is that an 060 in an adaptor in there, or an 040 (can't quite see from the pic)? KS 3.0/3.1 won't start with an 060 on an A3640 without a modified exec.library in rom.

24 January 2020, 04:48	#3
gary2000 Registered User Join Date: Jan 2020 Location: USA Posts: 5	no boot screen. 040

03 February 2020, 01:02	#5
gary2000 Registered User Join Date: Jan 2020 Location: USA Posts: 5	The only issue I had with running diagrom was a vertical hold problem rolling screen. Could someone tell me the in-circuit value of R514, which shows 10K? Mine is 3K or 4.5K without resistor, and this does not seem normal.

16 February 2020, 02:09	#6
gary2000 Registered User Join Date: Jan 2020 Location: USA Posts: 5	Well, it finally booted to Kick start screen! The Commodore roms went bad, which was surprising. One issue other than the occasional yellow screen, is when you put in a disk OVL is held high. You must turn off and turn on again for the high to low to happen. Has anyone seen this happen? Most games will not fully load and there is graphical corruption when trying, but work bench will load fine.

20 March 2020, 00:35	#7
gary2000 Registered User Join Date: Jan 2020 Location: USA Posts: 5	Mostly working at this point, but I have the following issues: When selecting from Gotek, you have to manually turn off the power and turn on to reboot instead of warm restart. Fast RAM 4MB shows as 1 - I believe this has to do with the power supply _fail + 5 V as shown in other posts. Only Gotek works as DF0 and original floppy is unstable and does not load much. All jumpers were set correctly. Sysinfo reports and ECS Agnus instead of Alice AGA. It also shows 25 mhz as 030, even though it is an 040. It sometimes reports as 16 mhz, also using Sysinfo 4.3. Some games work perfectly and some crash. Workbench loads ok. Any ideas on these issues?

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