Replacement Domed Apple II Keyboard Bulbs

I’m restoring a very early Apple II plus in order to sell. I believe that this particular unit is a very unusual example of an Apple II plus, as it has the second style keyboard with “domed” power light.

Apple II Keyboard Domed Power Light
Apple II Keyboard Domed Power Light

The bulb in this power light was burned out, so I did some searching and found an exact replacement is still available.

New and Old bulbs
Old and New bulbs

The bulb on the left is the replacement and the one on the right is the burned out original. The bulb type is a #680 miniature bulb with a wire terminal base. You can find these bulbs for 31 cents each, plus shipping, at www.bulbtown.com. Here is a direct link:

https://www.bulbtown.com/680_Miniature_Bulb_Wire_Terminal_Base_p/680.htm

In case this link goes away at some point, here are the specs:

#680 Miniature Bulb Wire Terminal Base – 5 Volt .06 Amp 0.3 Watt T-1 Wire Terminal Base, .03 MSCP C-2R Filament Design. 0.25″ (6.4mm) Maximum Overall Length (M.O.L.), 0.13″ (3.2mm) Maximum Outer Diameter (M.O.D.). 60,000 Average Rated Hours.

I’ve run this system over the course of many hours with the new bulb installed. The illumination is exactly the same as with an original bulb and there are no problems with the amount heat generated by the replacement bulb.

This lamp is only a replacement for the bare wire lead bulbs present in early keyboards, as later Apple II keyboards have a different style keyboard power lamp.

See my early Apple II keyboard page for more information on early Apple II keyboards.

http://www.willegal.net/appleii/early-a2-keyboards.htm

Gettysburg – Cemetery Ridge Photos – 1964 and 2021

In 1964, my family went on a 2 week camping trip. We journeyed from Wisconsin to Washington D.C. and back. We visited many sites over the course of those two weeks. The first place we stopped at was Gettysburg National Military Park where I fell off a cannon and developed a life-long interest in the American Civil War. Here is a picture of me on a cannon, just moments before I fell off of it.

Thomas's battery-then
Thomas’s battery-then

This was taken on Kodachrome slide film with a pretty basic 35mm rangefinder camera. This was a popular way to record vacations back in those days. A few years ago I scanned all the surviving slides from that trip. At the time I scanned those slides, I did some investigation and figured out that the monument next to that cannon, is the monument to Thomas’s Battery, Battery C, of the 4th US Artillery, which was part of the Army of Potomac Artillery Reserve. The key to figuring out where the picture was taken was that there was another picture in this sequence taken of the Pennsylvania Memorial. The Pennsylvania Memorial is just across the road to the right of where this picture was taken.

This summer, as part of a long road trip, I stopped by Gettysburg for a few hours. I decided that I had to stop by the Thomas’s Battery Monument and take another picture. This is how this location looked like in the summer of 2021.

Thomas's battery now
Thomas’s battery now

The area in front of the monument isn’t mowed, so I really couldn’t get a picture from the exact same angle, but this gives you an idea how the site looks like these days.

New YouTube Vintage Computer Playlist

The first video is an Apple IIc demo. Once I’m convinced it is 100% working, I’ll be listing this machine on eBay. I’ll be demoing other machines in the future. I’m starting with some machines I need to move out, since I need the space for future activities. Eventually I’ll be demoing some of my keepers like the SCELBI and Apple 1 clones.

Civil War Era Picture of W.F. Osborne

In this previous post, I speculated whether Captain Osborne was the unidentified officer in the group of officers posed with the Dictator mortar. Unfortunately the image of Captain Osborne was later in life and it was a bit hard to make a solid call. Recently, Susan, from the Osbornedate State Park sent me a wartime picture of W.F. Osborne. This picture sheds more light on the issue.

Captain Osborne
Captain Osborne

Based on this image, it doesn’t appear that Captain Osborne is the unidentified officer in the Dictator picture.

Why Was Lt. Gen. Grant So Annoyed About a “Tank”

if you haven’t already, read this post about General Grant’s annoyance with a poorly constructed “tank”.

The post implies that General Grant appears to have little patience with this seemingly small matter. I was recently reviewing that letter and it occurred to me that a couple of contributing factors might have been at play at this point in time. The key thing that I realized is that the date on the memo is March 27, 1865. Two things were going on around this time that might have shortened Grants temper.

  • The battle of Fort Stedman had just occurred on March 25th. It should be obvious that any kind of major battle, no matter what the result, should increase the amount a stress a commander is feeling.
  • Abraham Lincoln was at City Point at this time. Surely having your boss in town would increase anyones stress levels. Just speculating a little more, but imagine he visits your quarters and finds that he can’t get a drink of fresh water, because your water tank is defective.

So isn’t it just possible that the sharp memo about the lousy tank might have been at least party caused by a recent increase in stress levels that General Grant was subjected to? So the question is, is this annoyance of Grants a normal thing, or was it at least partly due to the stress he was dealing with at that particular moment in time? I can almost imagine Grant flying off the handle after Lincoln tries to use the water tank and finds it broken. Grant vents the frustration of past days on to poor Caption Schummaker who happened to be in the area at the time. Captain Schummaker responds by writing the memo that I found in National Archives.

SCELBI Running at 800kHz!

The Intel 8008 processor has two speed grades, 500 kHz and 800 kHz. The 800 kHz version is labeled as the 8008-1. Peter Miller is building a SCELBI 8B and decided to try to run his newly built system at 800 kHz. Using the existing hardware design he simply scaled the clock configuration. In his words…

Φ1 has a duty cycle of 42.5% and Φ2 has a duty cycle of 27.5%. The only thing I had to figure out an exact quantity for was the delay between Φ1 and Φ2, (rising edge of each, since that’s what my scope liked) which I just did (850ns + 200ns) * (500KHz/800KHz) = 656.25 ns.

What a nifty little hack! As far as I can remember or know, this could well be the first time that a SCELBI was set up to run at the higher 8008-1 clock speed. Of course, without doing additional detailed testing, there is always the chance that some component of the timing is marginal and some systems don’t work reliably at this higher speed.

Since I/O is timing is derived from the 8008 clock, most standard I/O devices will not interoperate with normal speed SCELBI I/O at this speed, but I’m sure the I/O could be fixed with some additional effort. Two devices that will probably require some extra effort are the O-scope and Cassette interfaces since they both utilize the hardware SYNC clock for timing. I/O like the serial interface that uses software for I/O timing, should be able to interoperate by simply retiming the software timing loops.

What Happened to These Guys?

Here is an image of part of the 1st Connecticut Artillery Regiment in Fort Richardson, a fort that protected Washington D. C. during the Civil War. This is a crop of an image that was probably taken in the winter of 1862, shortly after the conversion of this unit from infantry to artillery, and prior to the unit experiencing any combat. Note the spiffy uniforms and very military appearance of these men. Note the short swords and epaulettes. I think it makes for a very impressive display.

1st Conn Artillery at Fort Richardson
1st Conn Artillery at Fort Richardson

Here is another image showing men of the 1st Connecticut Artillery. In this case, the men are manning the famous 13″ mortar, Dictator, in front of Petersburg. This image was taken in the late summer of 1864.

1st Conn Artillery in front of Petersburg
1st Conn Artillery in front of Petersburg

What made me want to share these two images is the vast difference in appearance in the men between these two images. In the second image, the men assume a very casual appearance. Their dress is haphazard, with an assortment of hats and the frock coats have been completely dispensed with. What is more apparent is the lack of military bearing. They look to me exactly like a work crew at a construction site.

According to the regimental history of the 1st Connecticut, the regiment was initially sworn into US service on May 22nd, 1861 for three years service. The enlistments of the original men of this regiment were already up by the time of the second image. There is a note in the regimental history reporting that 400 men were to go home in May, 1864, well before this picture was taken. There were a number of new replacements in the regiment. Somehow, by now, the regiment was 1700 men strong, which was bigger than many infantry brigades from this time. The history contains a complete roster including enlistment and discharge dates for each soldier. I’m thinking about doing an analysis of company G, the company that manned the dictator to find out how the size and composition of the unit changed over time.

As pointed out in a previous post, a number of the officers of the 1st Connecticut, went home in late October and early November. I can’t find any indication of why the captains stayed on until fall.

Is the second image…

  • an image of men that were complete exhausted by war
  • veterans that were disdainful of the pomp of the early war days
  • draftees that didn’t care for military life
  • the difference between garrison uniforms and those worn on an active campaign
  • was there something else that caused them to appear so bedraggled?

I did find one hint in the history. That was a set of instructions that Colonel Tyler gave shortly after arriving on the peninsula in April of 1862. It says

The light blue pants will be packed in the knapsacks, and the old ones worn on the march.

That is all that I have on this topic at the moment. Any thoughts?