These are the random jottings of Andy Collins, a Fifty-something bloke who still thinks a blog or website is a good idea.
Here you will find small nuggets of information about Hovercraft, retro-computing and other stuff that amuses me or appeals to my sense of wonder.
Well, another RC comes to an end an if there’s any truth in the saying “It’s not the winning, it’s the taking apart” then all is well. If, however, it is the winning then we have another “success deficit” on our hands. So far I have the VT-180 in pieces. I looked at a few … Continue reading Retrochallenge 2016 – End of the line. All change.
So here we are, one week in to RC2016-01 and what do we have to show for it? As you saw in my previous post, I have taken the lid off the VT180 and it sits as a bare metal cage while I try to figure out what’s wrong. The initial display (shown on the … Continue reading Retrochallenge 2016 – Week 1 done. Some progress.
Let’s start at the very beginning. It’s a very good place to start – Apparently. According to the documentation, the VT180 is a VT100 serial terminal with a VT18X add on board. This add on is a Z80 single board computer that talks to the VT100 though one of its communications ports. this make for … Continue reading Retrochallenge 2016 – First look.
On the eve of ‘challenge I have retrieved my VT-180 from the “shelf of good intentions”. I have taken photos of the two main boards and powered the machine up to see what happens. The first board basically the Z80 board. The second is a VT-100 terminal (if I remember correctly) and they talk to … Continue reading Retrochallenge 2016 – Setting up my stall.
I was given this VT-180 machine a few years ago and after a quick look, I put it on the shelf to get round to later. Retrochallenge 2016/1 is the later it’s been waiting for. My aim this January is to mend this rather under rated but rather splendid CP/M-80 machine and get it to … Continue reading Retrochallenge 2016. Step forward VT-180.
I’ve been thinking about this on for a while. I even considered this as a Retrochallenge but I grasped the nettle and just did it. I now have a SCSI2SD card adapter on my PDP-11/53 running RT-11 🙂 I could show you pictures but there’s nothing to see really. This is the rather excellent page … Continue reading SCSI2SD adapter on the PDP-11.
Retrochallenge 2016 will soon be upon us. This month long chance to dust off old kit and play about a bit is always great fun and a chance to get round to stuff I’ve wanted to have a crack at for ages. Tradition dictates that I try in all earnestness to achieve something but I … Continue reading Retrochallenge 2016 – Decisions decisions.
EACA began making computers with the Genie name in 1980. The first model, the Video Genie System started EACA on the road of Z80 based machines that were mostly compatible with the TRS-80 Z80 based machines. I haven’t found any mention of Radio Shack’s opinion of having their machines cloned, which is a bit odd. … Continue reading EACA Genie 3 EG-3200
I replaced the 74s32 with a 74ls32 (the closest replacement I could get) and the machine didn’t leap beck into life. Disappointed doesn’t come close. I walked away for a few days and came back to it and it came up. I powered it of and on again and it didn’t. That’s a bit odd. … Continue reading RML380Z – and you’re back in the room.
I’ve been over the CPU and VDU boards and it looks like another chip has failed, probably as a result of my keyboard adapter. A 74S32 appears to have popped its clogs. More are on order. 🙂