techtravels.org – Exploring Amiga retro-computing and Electronics

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Oscilloscopes and Logic Analyzers

Couple hi-res images of 16902A mainboard

I just recently added another HP/Agilent logic analyzer to my collection. This time it is the 16902A. I needed to remove the CPU tray to replace the IDE HDD with a SATA SSD. As a result, I figured I’d take couple...

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Oscilloscopes and Logic Analyzers

Agilent Logic Analyzer cable teardown photos

So for today ladies and gentlemen, I present a teardown of an HP/Agilent logic analyzer cable. I think this is part number 16715-61601. This cable is used to connect one of a series of 40-pin compatible modules (many of...

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PAL REing

Creating a timeline of events

It’s often useful when trying to understand, debug, or reverse engineer a system to put together a timeline of operation from beginning to end. The result is a series of events where something happens first, then...

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PAL REing

Identify PAL inputs and outputs

In order to properly reverse engineer a PAL, you need to correctly identify which pins are inputs, and which pins are outputs. This in some cases is trivial because some of the PAL’s pin functions are fixed...

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Latest PAL Reverse Engineering Posts

PAL REing

Understand the system

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PAL REing

Why simply “dumping” a PAL isn’t always possible?

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PAL REing

New Reverse Engineering PALs page

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Latest Commodore Amiga Posts

Latest Oscilloscope and Logic Analyzer Posts

Oscilloscopes and Logic Analyzers

HP Agilent 5382A tear down with photos

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Oscilloscopes and Logic Analyzers

Setting up a SCSI2SD on HP 167xxA for CDROM and HDD targets

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Oscilloscopes and Logic Analyzers

How to mount HPUX 10.20 VxFS logical volumes in a modern linux environment

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Oscilloscopes and Logic Analyzers

Corrosion near/underneath HP Logic Analyzer module plastic runners

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Amiga A501 Replacement

A501 Replacement Inactive

Schematics now available for A501 replacement card

Schematics now available for A501 replacement card!
Find them on the main project page, located here.

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A501 Replacement Inactive

Added some new photos for A501 replacement

Added some new photos of the populated PCB for the Commodore Amiga A501 memory replacement card.
Find them on the main project page here.

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A501 Replacement Inactive

Cause of original instability and boot problems on the original A500 identified

So the very first A500 I had been testing on since the beginning of the project had a Bug Katcher installed. It turns out that I wasn’t really using it, but I left it plugged in anyways. I’m not sure...

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A501 Replacement Inactive

Sweet success, card works 100% in different DUT(Amiga)

So I think the Amiga 500 I was testing with has problems. I’m not sure precisely what or why but Today, I dropped my new A501 replacement card into a known-working Commodore Amiga 500. It fired up immediately no...

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A501 Replacement Inactive

Logic Analyzer probe loading seems to fix boot issue

While I had my logic analyzer connected to my memory card tonight, I noticed that I no longer had the white screen hang on bootup problem that I’ve been plagued with since this card came in. As a matter of fact...

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A501 Replacement Inactive

Stress testing the memory board

So I’ve written some assembly in the monitor software I’ve been using, and I’ve just created a large loop to see if I can get the card to fail. I’m still having plenty of problems on bootup, but...

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