Re: Packard bell PB450 two beeps

Posted on 2018-06-13, 21:18

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I purchased a few VGA cards but they're not yet delivered. I also sourced a working PB450 board and did some comparison between the two. I tried to swap the bios chip and it made no difference, this makes me believe it is not the bios problem Diag showed minimum difference but it detected monitor on …

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Re: Packard bell PB450 two beeps

Posted on 2018-06-11, 02:51

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

here is the image of the boot disk I used start diag, choose "create report file" in the right bottom menu. this will generate text file diag.rpt, rename to .txt p.s. there is nothing special about this diag, it's just random program I found online. There might be better alternatives

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Re: Packard bell PB450 two beeps

Posted on 2018-06-10, 22:36

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

phlash is not able to save the bios, at least there are no command line option for that. looks like it is very early version google DIAG447.ZIP

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Re: Packard bell PB450 two beeps

Posted on 2018-06-09, 20:01

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I now suspect it is the BIOS chip that is at fault, because it gave me two different checksums. I wonder if there is a program that can dump the bios to a file, so I can compare with one I flashed with Phlash.exe.

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Re: Packard bell PB450 two beeps

Posted on 2018-06-09, 19:23

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

OK I connected a monitor and ran it again. What did change was not the monitor, but BIOS Manufacturer and checksums! Filename DIAG (2).txt File size 21.1 KiB Downloads 59 downloads Filename compare.PNG File size 24.17 KiB Views 1614 views

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Re: Packard bell PB450 two beeps

Posted on 2018-06-09, 19:07

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Turbo key is depressed. No monitor was connected

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Re: Packard bell PB450 two beeps

Posted on 2018-06-09, 18:42

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is a report from diag.exe: Shows incorrect CPU speed Filename Diag.txt File size 21.1 KiB Downloads 62 downloads

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Re: Packard bell PB450 two beeps

Posted on 2018-06-09, 17:27

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I tried to flash the bios from PB450ISA.ZIP while I was able to boot I typed "Phlash", hit enter, and I get multiple beeps in two different tones, and then computer restarted Now I'm thinking about some test program that I can run without typing too much or completely unattended that would output …

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Re: Packard bell PB450 two beeps

Posted on 2018-06-09, 15:15

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I was able to boot from Freedos boot diskette today. And it looks like I can execute commands. "Dir" seeks the drive Also tried "echo test > test.txt" and the file was successfully created update: not able to boot anymore. Looks like it warms up and no longer boots after a few minutes.

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Re: Packard bell PB450 two beeps

Posted on 2018-06-09, 14:23

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is the recovery disk content attached. Yes I did get 4 beeps in the end, this makes me believe that the bios has been successfully recovered. It did not change anything though.

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Re: Packard bell PB450 two beeps

Posted on 2018-06-09, 00:51

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes the CPU is DX2-66 Changed J28 to 2-3, no effect I wonder what does this mean "J28 P24T or S-series reset control " The default setting is 1-2

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Re: Packard bell PB450 two beeps

Posted on 2018-06-08, 20:57

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I visually checked capacitors and they look good. I do have an ESR meter, may be it is worth checking. The only drive connected is FDD, and it is 1.44 I disconnected the external battery after I figured out it is not solving the problem so I'm now back with the dead battery.

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Re: Packard bell PB450 two beeps

Posted on 2018-06-08, 20:48

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm getting inconsistent results. Now I'm not able to start booting, even with no monitor connected.

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Re: Packard bell PB450 two beeps

Posted on 2018-06-08, 20:31

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The PSU is fine. I checked with voltmeter. Tried another boot disk (dos 6.22) - same thing. It starts loading but then freezes and do not respond on keys.

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Re: Packard bell PB450 two beeps

Posted on 2018-06-08, 20:08

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

this is getting interesting... I'm NOT able to boot with a monitor connected (tried two different monitors) It looks like the system is booting from the floppy without monitor connected, but when I try to type "DIR" and hit enter I hear no drive drive seeking.

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Re: Packard bell PB450 two beeps

Posted on 2018-06-08, 19:51

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think I should have mentioned I used just random bootable floppy, not the one I used for recovery with J17

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Re: Packard bell PB450 two beeps

Posted on 2018-06-08, 19:24

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Nope. But I was able to boot from the Floppy drive! I pressed F1 as you suggested and it looks like it started booting from the FDD. I don't see anything on the screen though.

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Re: Packard bell PB450 two beeps

Posted on 2018-06-08, 00:54

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

there is no such files (autoexec.bat phlash.exe) on the recovery disk here is the content: it comes from PB450RD.EXE which can be downloaded here http://files.mpoli.fi/hardware/ROM/OTHER/?C=N;O=D oldbios.bin file size is 128Kb, that matches the 28F001BX-T bios chip size http://www.lyr-ing.com/ …

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Re: Packard bell PB450 two beeps

Posted on 2018-06-07, 14:13

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

But if you make MS-DOS boot floppy will it boot? No I'm now trying to source an ISA graphics card and also ordered a POST tester card like this one https://www.ebay.com/itm/For-4Digit-PC-Computer-Diagnostic-Card-Motherboard-Mainboard-POST-Tester-PCI-ISA/173088762489?ssPageName=STRK%3AMEBIDX%3AIT&_ …

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Re: Packard bell PB450 two beeps

Posted on 2018-06-07, 01:27

by

by ahtoh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Tried again to connect external battery Also tried with no monitor connected, will try another monitor later still the same two beeps

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