Rescued CDTV from the crusher -

A good find…

It’s a chore to find yourself lugging junk down to the tip.  But every now and then you happen across a diamond in the rough! Today was my day to score as I spotted a Commodore CDTV unit lurking in a dark corner of the electrical disposal area.  She was looking poorly and in desperate need of rescue.  Needless to say I took on the challenge, plucking her from the ruin (yoink!) and saving her from certain destruction.  I am now the proud owner of a CDTV unit!

Does she work?

Well… no, she didn’t.  Completely dead.  Hence the throw-away, I presume.  But no self-respecting nerd would give up this easily; I released the top cover and had a bit of a poke around.  The fault was actually quite easy to find – a 5A fuse on the secondary side of the PSU was blown.  Of course, a blown fuse is rarely the root cause of the problem – usually some other fault is to blame.  In this case, though, I replaced the fuse and Bob’s your uncle – she powered straight up!

Where is the fancy CD boot screen?

That was my first observation, too.  CDTV units had a cool CD boot screen with a spinning disc and a laser.  This unit was just booting to a kickstart 1.3 floppy screen.  How disappointing!

JP15 Link

I noticed that the unit had a clunky old switch hanging off the rear.  This was clearly a poorly implemented modification by a previous owner.  An obvious application for a user-installed switch would be some kind of ROM-switcher, so I began to wonder if this was the case here.  The switch terminated at a 3-pin molex, but it wasn’t connected anywhere and nor did there appear to be an obvious place for it to go on the motherboard.  Eventually, though – after quite a long period hunting around the motherboard and scratching my head – I found JP15 which is an in-line 3 pin header.  It wasn’t a molex receptacle but the pitch looked about right.  Tried it on for size and it was a perfect fit!

CD boot screen

A couple of power cycles with each position of the clunky switch finally revealed the classic CD boot screen.  Even by today’s standard it looks uber-cool.  This photo doesn’t really do it justice:

HURAHH!

So, I am now a very proud owner of a Commodore CDTV.  She’s not the best of examples (the reset button on the front is broken and the keyboard is a bit worse for wear) but she’s fully functional and I reckon she’ll make a nice base unit for some hardware hackery.  It’d be nice to bring some modern computer peripherals to this machine and see if I can get them working together with her.  A hard drive would be nice, for example.  Hmmmm! To be continued!