@retrochallenge 2012 – Recreating The Past

I recently discovered an original brochure for the Epson PX-8 system and accessories.  In it is an image of the PX-8, along with the CX-21 acoustic coupler, the PF-10 FDD, and two printers, the P-80 and P-40.  I was pretty sure I had at least one of all these items kicking around in my collection of retro gear.  It occurred to me it would be fun to try to recreate the aforementioned shot given that almost 30 years had elapsed since it was originally taken.

Epson Printer Advertisement

I delved into my many boxes of gear and pulled out everything I needed.  It was then I realised there was one item that didn’t match, what I’d thought was a P-80 is in actual fact a P-80X which varies slightly in appearance.  Its plastic has also yellowed much more than the other peripherals and looks particularly bad when seen alongside what was my ‘new in the box’ PX-8.  I’m now wondering whether I should perhaps consider a session of Retr0brighting, one of those things I’ve always wanted to do but have never taken the dip.

I’ve always had a thing for portable printers and I’m particularly fond of the P-40 and P-80X. Mine are both in fine working order although I’m unable to hook up the P-40 to my Epson gear as it has a parallel interface as opposed to the P-80X which is serial/RS232.

First Test Shot

The P-40 requires thermal paper rolls, the P-80X can apparently print on either thermal or plain paper, I can vouch for the latter.  I’m now wondering whether it would be fun to hook it up to the PX-8 and use it as a kind of Teletype with all output going to the printer.  Anyway I digress.  I arranged all the peripherals as laid out in the original picture and took a quick test shot with which I’m reasonably pleased.

Original Shot

Thus far then not a great deal of challenge on the actual retro front.  Time to think of something fiendishly difficult to fail at.  That beginner’s guide to CP/M assembly in the above shot has caught my eye, I believe it came with my C128D and I’ve never properly looked at it.

@retrochallenge 2012 – Acoustic Coupling

Since contracting this retro computing bug, after prolonged exposure to Urbancamo, I’ve had a yearning to try to recreate one of my earliest and fondest computing memories.  That memory, when recalled, still has the ability to send a little shiver of excitement down my spine.  Picture the scene if you will, a musty old office in the maths block of my local upper school.  Two spotty teenage boys, myself and the aforementioned Urbancamo.  In one dingy corner of the room an ASR 33 Teletype, on the window sill an acoustic coupler and telephone and on a piece of paper, a phone number.

ADC 212 Internals

Thinking we were Matthew Broderick from WarGames we eagerly dialled the number inserted the handset into the coupler and waited excitedly for the Teletype to burst into life.  Sure enough the ASR 33 started clanking away and we were in!  Not NASA or anything like that you understand, but a nearby college upon which we were able to play a game called Shark Attack!  A momentous moment in my computing history and the first and last time that I ever used an acoustic coupler.

Epson CX-21

I have for some time therefore been on the lookout for a working acoustic coupler that I could use to try to recreate some of that experience.  After failing to bring back to life a very old Anderson Jacobson ADC 212 model, I was recently lucky enough to sport an Epson CX-21 on Ebay.

It’s in lovely condition, and the original NiCad battery even appears to hold a reasonable charge.  It came with an Epson HX-20 in a custom-made case which no doubt accounts for its excellent condition.  There was a little blooming on the rubber cups but I cleaned this off with a mild detergent solution and the whole unit looks almost new.

I will of course also need an old telephone with suitable handset and fortunately we still have a couple of 1970’s models at work that thankfully were never thrown out. These old BT models were built to last and the one I chose cleaned up really nicely, in fact it looks so cool I may use it in place of our current home set.

CX-21 Battery

The CX-21 only has two options to select, half or full-duplex and answer or originate mode.  It has a standard DB25 port and I have the appropriate cable to hook it up to my PX-8, an Epson 724 cable.  This is a modem cable with DB25 at one end and an 8 pin Mini DIN connector at the other.  I have two options for terminal software on the PX-8, both previously downloaded, Kermit and Mex.  The PX-8 does have a rudimentary terminal application on the built-in ROM but I’ve never had much success with it.

After charging the CX-21 and PX-8 I hooked up the TF-20 FDD and copied over all the software I’d need to the PX-8’s RAM disk so I had the minimal amount of stuff to take home from where I would be calling back to the box running my BBS.

Epson PX-8 With The CX-21

I then spent rather too long trying to get my head around whether I was originating or answering the call, clearly I was originating it and the BBS box was answering but for some unknown reason I’d convinced myself that the coupler would have to ‘answer’ the handshaking attempts of the remote modem.

Nevertheless once sanity had been restored I set the coupler to ‘originate’ mode at full-duplex and dialled the BBS with the telephone.  After several attempts the ready light finally illuminated on the coupler and it seemed a connection had been established. However once I’d connected via the terminal software all I received was a screen full of garbage.

I checked all my settings, made sure background noise was minimal and continued to make many more attempts to create a good connection.  Eventually I discovered that contrary to my instinct to push the handset more deeply and securely into the coupler, lifting the mouthpiece end slightly out of the cup resulted in a much better connection!  Whether the proximity of the transducers was causing some sort of distortion I don’t know but whatever the reason I now had a working connection and was reliably able to re-create it.  There are still a few erroneous characters coming through but I can live with that.

I shot a quick video showing the process below, all I need now are a couple of ASR 33’s.

Retrochallenge – Summer 2012

This year’s Retrochallenge will soon be upon us, running for the entire month of July there’s still time to sign up and participate.  Head over to the Retrochallenge Website and register your interest.

This year I’m hoping to hook up my recently acquired Epson acoustic coupler to my PX-8 and with the aid of an old telephone dial in to one of the few remaining dial up services out there, and no doubt my own BBS.

Epson PX-8 Brochure

In my previous blog entry I posted some scans of some promotional literature for the PX-8 and it occurred to me that I’m now in possession of the all the hardware shown in the image opposite.  I thought therefore it might be interesting to try to recreate the shot.

Other options are to create another instalment for my Silent Running text adventure created with Inform.