29
Jul
16

The Remains of an Epson and Reply Corp PC.

Whilst I was on holiday at my parents place I did some photography of old hardware I  have. I got out the remains of two currently dead PCs, one an Epson PC AX2 and another, a Reply Corp machine.

The first machine was made by a company called Reply Corporation (or Reply Corp for short). Interestingly there is absolutely no information available about the company online, almost as if they had never existed. I did manage to find a few machine reviews within the Google books archive of some PC magazines, but other than that nothing really. There was a segment or two featuring them in the Computer Chronicles (an old American TV Show) but I couldn’t find the particular episode.

As far as I could tell Reply Corp started out making PC cards for Macintosh machines. These cards brought PC compatibility in a limited degree to Apple machines so that popular software like Lotus 1-2-3 could be used. It seems that somewhere along the line they started making their own clone machines. They were one of the few third party manufacturers to actually purchase the rights and make MCA (mirco-channel architecture) machines. With MCA failing in the market and PC cards being a very niche product, it’s no surprise that Reply Corp disappeared into obscurity.

The machine I have is one of the MCA machines, a model 16 with a 486dx 33Mhz chip, note I’ve stripped out the drives and power supply for use else where. Unlike the IBM MCA machines it doesn’t use a fancy modular and tool-less design, instead opting for more standard mounts for the drives and power supply. This made it easier to replace these components without having to buy proprietary ones like those in the relevant IBM machines. Note the CPU is mounted on a module, we’ll take a closer look.

Here’s the CPU module up close. At the time PCs generally had either the CPU soldered onto the board, a standard chip socket (DIP/PLCC for the 286) or an old style LIF (low insertion force) for the 386 and earlier 486 machines. These solutions made upgrading a CPU a difficult task, if not impossible. Reply addressed this by using an easily replaced module, something quite unique amongst IBM PC compatibles of the time. This particular module has a 486dx chip rated for 33Mhz, but when it was running the BIOS reported it as a 486SX @ 25 Mhz, so I wonder if this is the original chip. The oscillator on the board is 50Mhz, which would indicate the module was made to run at 25Mhz (the oscillator frequency is usually halved).

The motherboard has a Chips and Technologies chip set along with a relatively thick layer of dust. It has on-board VGA graphics and unusually 2 25-pin serial ports and 2 parallel ports. Chips was never known for high performance, but they are usually quite compatible. They may have been one of the few to make a third party MCA chipset.

We got the machine originally as a replacement for our aging 386sx, it served us well for playing MS-DOS games for quite a few years. I believe it may have been ex-government as it had a SCSI hard disk and controller as well as a token ring network card. It has an unfortunate annoyance of requiring a setup boot disk to configure the BIOS settings much like IBM machines did. Unfortunately there doesn’t appear any way to get a disk now. The board has since failed, giving a BIOS beep code indicating a parity error. I’ve tried resuscitating it to no avail.

The second machine is an Epson PC AX2, which is essentially a pretty bog standard clone 286 running at 12 Mhz. My uncle gave it to my Dad for some reason, and it was basically dead upon arrival as it was already missing its power supply.

The insides of this machine are looking bare among our reading material on the table. I had stripped out the I/O cards it had some time ago. It had a MFM hard disk controller, an EGA card and a floppy controller. It doesn’t have much integration on the board despite the number of chips, basically only a keyboard port is provided.

It has a AMD made 286 running at 12Mhz. You may notice it has the Intel copyright on it, this is because AMD was a second source manufacturer of the 286 (and other earlier processors) to ensure availability of the parts. This would be the last processor that AMD would second source for Intel, as they stopped co-operating before the release of the 386.

This machine has a module as well, even mounted and connected in a similar fashion. The difference is this module appears to be for the main memory and ROM for the machine. It’s an odd design choice, but perhaps the ROM and memory design were shared across models and designs of Epson machines. This would not be an upgradable module, memory upgrades often came in expansion cards for the ISA bus.

These three chips seem to confirm what I had seen online, that this model was originally released sometime in 1986. What’s interesting is the date code for these chips indicates the 23rd week of 1989, which would have made this machine quite obsolete at the time of manufacture. I’m surprised they didn’t upgrade the design to 16 or 20Mhz as they were common speeds for the 286. The three chips are almost certainly the base mother board components such as interrupt, timer and DMA controllers.

IMG_2530Here is the reason I can’t run this machine currently. It has a power connector with an unknown pin-out, and with the original power supply missing I don’t have much chance unless there is some documentation around. This is unfortunately common for earlier PCs as standards hadn’t been formed yet.

I’ve been keeping both these old machines in the hope that one day I might find or work out the information needed to get them to work again. They’ve unfortunately languished under a table in my room at my parents place collecting dust, I hope they’ve at least been somewhat interesting to look at today, as they aren’t much use as they are.

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2 Responses to “The Remains of an Epson and Reply Corp PC.”


  1. July 31, 2016 at 12:47 pm

    I had no idea anyone bothered using MCA other then IBM. was that a co-pro slot for a 487?

    • July 31, 2016 at 12:53 pm

      It could be, but there’s no way to know for sure, although it would give more credit to the idea that it’s had the CPU replaced. It could also be a socket for external cache, but it’s probably a bit large for that. Some of these machines ran 386 CPUs instead, but again the socket is too large for one of those. So I think a 487 socket is the most likely.


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