A4000D boots with A3640 but not BFG or TF

[Tumbleweed]

Hi all,

I have ome weird issues with my A4000D when I upgraded the A3640 to the TF4060.

Installed the TF4060. Switched on. No boot off HD. Tried booting off floppy - boots off WB3.1. Thought it was a HD installation issue, but have MMULibs.

A4000D is KS 40.68 and OS 3.2.2.1. Swapped out the TF4060 with the A3640 - all good. Boots fine.

Thinking the issue was with the TF4060 I installed it in my A3000D. Swapping out the BFG9060. Works fine - no issues (The TF4060 onboard IDE not tested - 3000D doesnt have the INT2 mod).

I then tried the BFG9060 in the 4000D. No boot. So thinking the issue is with the 4000D.

What was common with the TF4060 and the BFG in thre 4000D was I coudl not warm reboot the A4000D. Power light flashed but it did not complete the warm reset. This does not happen with the A3640 - warm reset works as normal.

On tha bsis Im thinking a problem with the reset circuit - but why wouldnt it impact the A3640 only the BFG9060 and TF4060? The BFG uses internal clocks; the A3640 external as does the TF4060.

How can I test the reset circuitry is working ok?

Weed

[Tumbleweed]

Thanks Castellen.

I measure voltage = 4.85v on pin 1 of the IDE from a cold power on.

Warm reset: ctrl left amiga right amiga power light dims Voltage drops to 0.14v; release power light brightens voltage jumps to 5.77v; then falls back to settle at 4.85v.

The TF defaults to 50 mhz; you can change the clock frequency through software to set it at say 75mhz but it always starts at 50 mhz from what I've read. The clock jumpers Ive set as:

J100: 2-3
J104: 2-3

I have a CSMKII I can also try but suspect the results will be the same.

With the TF I can boot to workbench from floppy and then access the HD - all partitions show. I can also run Amiga Test Kit (ATK) and Versatile Amiga Test (VAT) from floppy.

The 4000D did have battery damage which I repaired. As part of that repair I replaced the original v09 Buster with v11. It wouldnt boot with the original Buster which I concluded was defective after running diagrom. Also at the time it wouldn't boot with the original A3630 but did with the A3640. At the time I thought I had a problem with the A3630 but maybe the fault was/is somewhere else and switching to the A3640 masked it. I'll look at it again tomorrow.

Much appreciated.

Weed.

[Tumbleweed]

Hi Jeff,

Buster is socketed. Desolidering the socket and surface mounting the chip is probably beyond my soldering skills though. When I repaired rhe mother board it was a few track repairs and resoldering the smaller chips U975, U976 and U177. I'll have a proper look at it this weekend.

Thanks for the suggestion.

Weed

[Tumbleweed]

Thanks Castellen. Sounds like I need more advanced kit to test properly. My multimeter isnt sufficient.

The BGF and TF4060 both work fine in my 3000D. No issues booting and stable.

The TF is really odd - boot from floppy and seems to be ok ish. Can see hard drive and all looks ok. Just wont boot from HD.

What I did see is when I warm reboot (with the TF) the power LED dims and then blinks continually looks to be stuck in a reboot cycle but never actually reboots. it doesnt do that with the A3640. Reboots as it should. Same happens with the BFG, LED blinks continually and then is stuck in a reboot cycle but doesnt complete.

Weed