Why the Apple II Didn’t Support Lowercase Letters
vintagecomputing.com
vintagecomputing.com
He doesn't explain why the Apple II+ (1979)—after the II's market success was proven—doesn't support lowercase letters. Even if software uses graphics mode to display lowercase letters, the II and II+'s keyboard does not have physical/electrical support for detecting shifted letters. Since graphics mode is cumbersome and slow, word processors for the II and II+ typically use reverse video to indicate capital letters, and use another key like Escape as a shift toggle. A popular alternative is the shift-key mod that fattire mentioned, which requires soldering of a wire to one of the paddle ports.
The lack of support is because the company was working on the Apple III (1980), which it expected would quickly obsolete the II series. The III has built-in 80-column text and full lowercase support, at both the character-font and physical-keyboard levels. Apple had incentive to not make the II too attractive.
Neither Woz nor anyone else at Apple expected that a) the III would quickly fail, and b) the II series would remain Apple's bread and butter. Without the III's distraction the II+ would surely have had built-in lowercase software and hardware support, or there would have been another II around 1981 with such. As it were, the III took up so much of Apple's resources that the Apple IIe did not appear until 1983, by which time the IBM PC had surpassed the II series.
The Apple II video screen is 40 bytes wide, but it only draw 7 pixels per byte, for a total of 280 pixels. The 8th bit was used for selecting the color pallet (eventually; initially the 8th bit was just ignored)
Drawing 7 pixels per byte makes everything a lot more complicated, so it would seem to go against Woz's obsession for simplicity. It's hard to believe that 7 pixels per byte would reduce the chip count, and it certainly makes the software a lot more complicated (lots of divide-by-sevens).
CGA graphics and the Atari 400/800 also provide a composite graphics mode similar to the Apple II, where each pixel lines up with the NTSC color burst frequency, but they draw 8 pixels per byte for a total of 320 pixels, and therefore use a wider portion of the screen.
Perhaps Woz thought (incorrectly) that the NTSC screen wasn't wide enough to accommodate 40x8 (320) pixels so he cut it down to 40x7, or he planned all along to use the 8th bit to provide extra color. It would be interesting to know the actual reason.
While NTSC allows 320 pixels, typical analog TVs overscanned a lot and you'd miss the right and left column or 2 of text.
The Apple always fit. Atari machines often didn't.
On my personal "monitor", I scored a finer dot pitch CRT and did a lot of work to put the entire frame on screen.
Atari did allow wide screen DMA which used up nearly the entire active display area.
I would run a 384x224 display on it sometimes.
And after a full alignment, better CRT, one could read 80 columns on the set and watch color programs look very good.
... a lot of the picture quality impact the pro grade CRT TV displays had was due to finer pitch CRT's.
The circuits matter too. Don't get me wrong.
Even without a spiffy fine pitch CRT, a well calibrated 80's era TV (some 70's era ones too), worked well as a monitor.
I had worked at a TV repair shop as a younger kid. The Atari machine I had was just good enough to generate respectable alignment and calibration signals. If you were willing to put in a good day, many sets could perform far better than they were just sitting there on, showing slowly degrading TV programs.
But, they tended to age and degrade a lot more quickly than we are used to today. I did my special one three times over the course of 5 years or so to keep it at peak.
That's another difference in the pro grade gear. It stays on point for ages.
With Apple setups, one could deliberately calibrate to maximize the essentially monochrome screen, and expand it to take up a larger area to get a little bit more benefit from the often coarse shadow mask on color sets.
Many people would just run both. Monochrome for text, some color TV for graphics.
A workaround for color sets was to run saturation a bit low and make sure the color killer circuit was hair trigger so it worked when the Apple requested no color.
Moderate contrast, bringing up the screen levels while at the same time lowering the drivers would sharpen things up considerably. End result was a decent resolution and that "don't use it in a brightly lit room" tradeoff.
Bonus points for tapping into composite, avoiding RF. Where I lived a lot of people had UHF modulator on their Apple computers. These worked on something like channel 34 instead of the more interference prone channel 2, 3 or 4.
The real fun began when VCR's got the scene. Hit record, set for SLP recording and you got an up to 8 hour record of what you did.
Or, run the VCR faster and get a higher quality record for show and tell or debugging.
If you crave a CRT today, obviously the pro grade displays on their way out are great. You will likely be impressed when watching something off DVD, or Bluray. Standard definition was much better than most of us saw due to the tradeoffs made in mass market displays.
But, those are harder amd harder to get.
The next best thing is a newer CRT. Clean and recap that if needed and then go through the alignment and calibration using one of the many DVD images available for that purpose.
Many of those have great filters that can do a lot for Apple 2 like signals.
Then enjoy the artifact art in all its glory!
http://www.appleoldies.ca/bmp2dhr/disclaimer/
The images on this page use the better "Double High Res" artifact color possible on the Apple //e
There are some examples of Apple 2, the original graphics being discussed here, on that page.
Many artists used patterns to exploit secondary artifact effects (best seen on an NTSC TV with color saturation turned up a bit), and our own color perception to produce images that appear more colorful than the basic 6 color design one would expect to deliver.
This pixel art can be seen all throughout the 8 bit era running from the late 70's to mid to maybe late 90's.
https://images.app.goo.gl/1wzZhp76tsC3hC6G6
In that one, only one color attribute set was used. Black, white, orange and blue. The secondary artifacts shows nicely here.
A single orange pixel by itself on black delivers a little bit different overall image color when nestled in all white pixels.
Dithering coupled with these subtle effects could really change the overall viewer perception!
In addition, due to how the NTSC color worked, intensity and color got coupled together, giving pixels a sort of texture and subtle position difference when viewed on a color display. On the Apple, this can be seen as a smudge of color around the pixel. You can see this in the lower resolution graphics where the pixels literally don't quite line up.
Many more and better can be seen on the Total Replay image being developed right now.
Emulators have modeled what a real display would do very well. You get a whole lot of the experience that way.
I don't think overscan would be an issue. The TMS9918 is also (the equivalent of) 320 pixels wide, and it was used in many different home computers and game consoles intended to connect to the family TV. There's no overscan issue, unless it's connected to an Apple II monitor.
When the TMS9918 is connected to an Apple II monitor there is a huge overscan issue, since the monitor is tuned for the narrower Apple II screen. It looks like this: https://imgur.com/rGcRpw0
That's what got me thinking about this issue is the first place.
If they'd shipped with 320-wide video, a lot of people wouldn't have seen the prompt on the left hand side.
That's the heart of the question. Did Woz think that 320 pixels would not fit, or did he cut the width down for another reason, like more color.
If you look at the video generation circuit on an Apple ][ it's all done in real-time in TTL, alongside the DRAM refresh activity. And it's all crammed into the normally unused tock of the 6502, making this work with virtually zero overhead on the CPU. That's the reason why the memory mapping of the screen isn't linear to the physical display. The software tradeoff was cheaper than the hardware one.
http://twimgs.com/informationweek/byte/archive/Apple-II-Desc...
Overall, given memory expansion, the goofy screen didn't end up being too big of a deal. Most programmers made Y axis lookup tables and called it a day. The fact that the artifact color mapping repeated every word, two bytes, did have an impact in that it was generally faster to maintain two pre-shifted copies of software sprites though.
You'd think that the 9918 would be a bottle neck between the CPU and the VRAM, but the Apple II can write to the 9918 VRAM as fast as its own internal RAM. Faster, actually, since the destination address auto-increments. That was a surprise.
Hmmm, is the bitmap linear by line, or C64 style?
Auto increment + C64 style would rock pretty hard. It's still good per line.
Both have their merits.
A single screen is divided into 3 separate tile maps, each 256 bytes long.
It also supports 32 spirtes but only 4 sprites per scanline, which is its biggest limitation.
The Sega Master System used an upgraded version of the 9918, adding 64 colors, smooth scrolling, and 8 sprites per scanline, all within the same 16 kB of VRAM.
Yeah, auto-increment can rock! Blasting characters to the memory would be fast, and only require a precise index for the source data. Perfect for the 6502. Other index can be done every so often, depending on what is being drawn.
In the Apple 1, only 7 bits were output. Expanding that circuit to do graphics would take a byte and still output just 7 bits, simple.
People are pretty sure the Apple 1 video circuit was just expanded to do graphics, which is why it's 7, and that left the high bit for a color shift.
Here's an example Atari BASIC program that uses POKE statements to change and then restore the default margins.
Interesting! I never noted that before.
I don't know whether this story is true, but it's what we were told.
That's a funny little piece of computer history.
This image (white text on a blue background) shows how the 9918's native pixels line up with the NTSC color burst frequency: https://imgur.com/rGcRpw0
The phase shift makes a big difference.
Having 6 colors and the artifact art variations was enough to do pretty much anything, not always well.
Had it been 4 color, it all would have been far more limited.
Frankly, the screen being good enough may be part of why graphics adapters never became common.
I always thought they should have.
Once accelerators took the 6502/816 to 4Mhz plus, a graphics adapter, perhaps combined with a faster CPU would have made a ton of sense.
The power of the default was stronger due to that 6 color capability, IMHO.
Compare 4 color CGA and it is notable.
That said, CGA over NTSC was Apple like with 16 colors, no attribute clashing. That is what an expansion card for the Apple 8 bitters should have done.
The graphics mode is just a juiced up text mode, so the 7 pixels were kept.
And for the video shift register, it's no difference if the input comes from the character ROM, or video RAM.
I think all the circuitry for shifting out the pixels must have been very minimal and shared between the text and hi-res mode.
So, .. if you recall, the character cells in the 40 column text mode are all also 7 pixels wide. The character cells were 7x8. In that space, a certain font fit exactly, with a two pixel space between characters. Here is A:
OOO |
O O |
O O |
OOOOO |
O O |
O O |
O O |
|
-------+
In high res graphics mode, you could create a bold font, by using the extra column: OOOO |
OO OO |
OO OO |
OOOOOO |
OO OO |
OO OO |
OO OO |
|
-------+
That was seen in a lot of games.Anyway, the high res graphics mode pixels coincided exactly with the text mode pixels. You could imitate the text mode using high res graphics, and it would look indistinguishable. (Except for not being able to make the characters blink simultaneously, though even that could be sort of faked with page flipping.)
I think that in a 8x8 character cell that would result from a 160x192 mode (40x24 text), it might have been more awkward to design the font. You want an odd number of pixels, for symmetry, so probably characters will be 7 wide. 5 would leave 3 pixels of space, which might be too much. For designing 7 pixel font glyphs, maybe 7 scan lines is not enough height.
It's possible that part of the decision was around the design of the text mode and its font, and the high res graphics was tied to that, pixel for pixel.
edit: corrected below, rev 0 non RFI (without the aux vid pin) ignored DL7
A later revision added support for 6 colors, using the 8th bit to shift the pixels and change the pallet.
Most 2bpp displays of that era made wider than tall pixels.
The result, given creative use of patterns was a high res display that could pretty much do anything. Maybe not that well, depending, but 6 colors per line makes differentiating objects clear.
4 is not quite enough.
I would like to know as well.
The palette selection was achieved by...
(Yes, it's that cool)
Shifting the 7-pixel group half-pixel to the left (IIRC, could be to the right). It was a trick used in HP terminals (Woz worked for HP) and printers to have nicer fonts without doubling the pixel clock and character ROM sizes.
For color, this put the pixels at offset positions in relation to the chroma wheel and that caused the switch from green/purple to orange/blue.
With the Apple 1 he also used 7 bits per character, but he stored them with 7 1024-bit shift registers.
Do a quick search for "apple II shift key mod" and you'll find vintage PDF instructions for adding it yourself..
https://archive.org/stream/II_II-Shift-Key_Modification/II_I...
I recall making a "shift key mod" within days, that no doubt voided my warranty. It wasn't the mod described in this article. I recall some card that gave me 80 columns, Pascal, and increased my memory from 48K to 64K. I believe that my shift key mod involved cutting a single trace? In any case it worked. Various out-of-school friends learned computers on this machine, and changed careers. I learned the low memory locations like the back of my hand, and wrote crude Pascal programs, while my "real" code was in the relatively young C language on a Unix timesharing machine. That all changed when I bought one of the first Mac 128K's. Manx Aztec C!
http://mirrors.apple2.org.za/ftp.apple.asimov.net/documentat...
Another amazing bit of kit by Videx was a replacement keyboard controller called the Enhancer II:
https://archive.org/details/Videx_Enhancer_II_Installation_a...
The Enhancer II included the lower case chip.
Videx also made an 80 column peripheral card for the Apple II. The company is still around:
I'm just curious, was an engineering job at HP in the 1970s not well paid?
When I graduated with a B.S. in 1982 I had 4 offers, ranging from $22K to $28K. It was enough for the two of us -- our apt was $275/month. But there wasn't a lot left over.
Early on, I didn't have a machine of my own and would hand assemble programs to be typed in next time I could get some machine time.
FD7E: C9 E0 CAPTST CMP #$E0
FD80: 90 02 BCC ADDINP ;CONVERT TO CAPS
FD82: 29 DF AND #$DFhttps://en.wikipedia.org/wiki/TV_Typewriter
I bought Don Lancaster's book from Radio Shack long ago...
Also: what new technology are people desperately trying to get access to? I need to start the new Apple..
https://twitter.com/benjedwards/status/1303784698662055936?s...
https://ux.stackexchange.com/questions/72622/how-easy-to-rea...
> The weakest evidence in support of word shape is that lowercase text is read faster than uppercase text. This is entirely a practice effect. Most readers spend the bulk of their time reading lowercase text and are therefore more proficient at it. When readers are forced to read large quantities of uppercase text, their reading speed will eventually increase to the rate of lowercase text. Even text oriented as if you were seeing it in a mirror will quickly increase in reading speed with practice (Kolers & Perkins, 1975).
[0] https://docs.microsoft.com/en-us/typography/develop/word-rec...
edit: as in, perceiving that 1% case will require more effort.
I really think it's a matter of habit and tradition more than anything else.
Hollerith constants where the way you did text to terminal IO in Early Fortran's.
For example "Press 1 to exit, 2 to edit settings, 3 to start run?" instead of just "?"
Then when we got terminals that had lowercase fonts too, the Unix source was surprise! all lowercase. Because that's how it was typed in and nobody noticed.
So to almost anyone, seeing a long block of text in all uppercase may look stodgy or ugly or formal, but all lowercase looks wrong or provocatively artsy, so if you have to choose one or the other, all capitals is kind of a no-brainer.
All upper case, caps were just bigger than the others.
Stayed with that until I left High School. Was making some point or other, or was just a PITA.
Needless to say, typing handwriting assignments does nothing to improve handwriting!
Nearly forty years later, I still haven't learned to write in cursive, and my lower-case printing is either illegible or painstakingly slow. So, with the exception of single-character mathematical variable names, upper-and-small-caps it is.
Cursive was developed to work with traditional pens, and it really does not flow well on a ballpoint. But the school systems, of course, never made such a distinction.
I remember just quitting. 26 alphas + numbers and punctuation, and that's gonna be IT.
One counter argument was legal signature requirements. Had a parent from city hall clear the law up for me.
Was loaded for bear, and my little school really opposed not writing cursive. I remember a few of us, almost all boys going down the road.
Interestingly quite a few girls ended up with a sort of print-script we see in cutsie fonts today. Went totally without comment!
It was the //e and //c that had built-in lowercase support.
I mostly remember that the RAM upgrade changed the gauges in MS Flight Simulator from octagons into rounder circles.
I actually didn't realize until I had to use a ][+ at school later that some computers didn't do lower case :)
Lowercase and 80 columns were available from third-party vendors for both the II and the II+.
Source: I still own my II. Also:
BASIC and the monitor were stored on ROM chips on the motherboard. The II and II+ were basically the same computer with a different set of BASIC ROM chips installed.
Edit: It is actually possible to have both sets of ROM chips installed if you use a Firmware card. Very handy!
https://archive.org/details/Videx_Videoterm_Installation_and...
It was common for Apple resellers at the time to sell them with third-party add-ons.
I used to read them daily.
HN seems to have filled some of the gap it left but I don't know of any other site since that has the same volume of really high quality content. I see some comments here blaming the inability for everyone to do metamoderation - but I'd say it was the opposite. When they had decent editors things were great. Your content will be as good as your moderators and I think reddit proves that simply having more of them doesn't assure better content.
That's when I quit. Why did you stop?
Edit: I coulda just said the nazis part but some folks here don’t wanna see ads so
On the other hand, there’s a subreddit for practically every hobby. In many cases, Reddit is home to the largest community related to a hobby. Sometimes things related to my interests outside of tech pop up on here, but the discussion is rarely in depth.
That was back when slashdot was a real tech site.
Attention bomb?
Your suggestions here, go!
Either way, there will be some of us asking, "wut?"
Better instead if he had had some investor cash earlier. But as a hobbyist, he wasn't playing the "long game" anyway, just trying to make something cool for himself and bragging rights at the 'Brew.
Right now a generation of young people in the United States are completely priced out of going to college, or facing eviction from COVID related layoffs. The slightly older cohort are seeing a much higher proportion of their wages go to high rents and student loan debt than Woz's generation.
As a society, we're are missing out on bottom up innovations because would be inventors are too busy trying to survive than to create.