LisaList2

Atkinsonpoint – LISA Slide Show 1.0

A native slideshow tool for the Apple Lisa Office System. It appears on the LOS desktop
as its own icon, opens into a full-window carousel, and displays 680 x 300 one-bit
pictures – photographs dithered on a modern computer and delivered to the Lisa over a
serial line. Click or press a key to advance, or let it run itself at one of three speeds.
Written in Lisa Pascal with the Workshop 3.0 toolchain; runs under Lisa Office System
3.1 on real hardware.
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Why "Atkinsonpoint"

The name honors Bill Atkinson twice over, because this program depends on him twice
over.

Atkinson wrote QuickDraw, the graphics library at the heart of the Lisa and, later, the
Macintosh. Every pixel this tool puts on the screen – the window, the menus, and the
single CopyBits call that blits each slide – is drawn by his code, running where he wrote
it. QuickDraw on this machine is not a tribute or an emulation.

Atkinson also devised the dithering algorithm that bears his name: a technique for
turning grayscale photographs into pure black-and-white images that still read as
photographs. Like Floyd-Steinberg dithering, it diffuses each pixel's quantization error
to its neighbors – but Atkinson's version deliberately spreads only three quarters of the
error (one eighth to each of six neighbors, discarding the rest). Throwing part of the
error away costs some shadow and highlight detail but keeps the midtones crisp and
airy, which is exactly right for a 1-bit screen viewed at arm's length. It became the
signature look of early Macintosh imaging (MacPaint, HyperCard).


And the name is a small pun on "PowerPoint," by way of Teslerpoint (see Thanks): the
Lisa was always meant to give presentations

Tom Stepleton – his Teslerpoint proved that a Lisa makes a fine slide carousel and
inspired this program. No Teslerpoint code is used here (that program is bare-metal
68000 assembly; this one is Pascal on the Office System), but the idea is his. His
lisabbs and documentation work also underpin LISACom, this tool's companion.

Alex Anderson-McLeod (alexthecat123) – his LOS Minesweeper is the template every
LOS desktop tool in this family is built from, and his LOS Compilation Base image
supplies the Workshop environment and Apple's own ICONEDIT. His LisaFPGA made
nightly testing practical.

Here is the python script used to make images for the slideshow

GitHub link:

BMWCyclist GitHup

Extra "bonus" images for the slide show! (400k LISA LOS 3.x floppy images)


If you don't have a cable to create your own PIX here are some more to get you by.

NASA and SciFi from the 70-80s

Let me know if you have any requests!

You will need Workshop to copy these to your hard drive.

I plan to explore a feature to copy from the SlideShow program in the future, but don't count on me.

Tim

Each version of your slide show - comes as a compact application with images embedded; my take on this is if you want to have the original and NASA running you'd need to have the app twice on your HD/desktop - one for each vs having one app that can sequence multiple images - is that correct?

Quote from: ChiTownMike on Yesterday at 12:14:04 AMTim

Each version of your slide show - comes as a compact application with images embedded; my take on this is if you want to have the original and NASA running you'd need to have the app twice on your HD/desktop - one for each vs having one app that can sequence multiple images - is that correct?

Hello!

I am about to post the new 1.1 version, which should make that clearer.

The app will display .PIX images on the same volume as the app.

If the app is on an internal widget/profile it will display the .PIX images on that volume.
If the app is on an external Profile it will display the .PIX images on that volume.
If the app is on a floppy it will display the .PIX images on that floppy.

Does that make sense?

The new version which I am about to post will allow image copies from floppy without the need of using the Workshop or a serial cable.

Let me know if I answered your question and if you have any more!

thanks!

Atkinsonpoint / LISA Slide Show 1.1 — what's new!!!

- **Copy Pictures from Floppy** (Show menu). Insert a floppy of .PIX files, pick the item, and every picture copies to the volume the tool lives on. Existing names are never overwritten. The Workshop is no longer needed to install pictures (or serial cables if you are making your own photos on a PC or MAC)

- **Remove This Picture** (Show menu). Deletes the slide on screen. Pick it once to arm, again to delete; anything in between cancels. NOTE: as a safety feature, you MUST select this TWICE in immediate succession.

- **Three bonus picture packs**, each a 400K floppy image with the 1.1 tool aboard: NASA (pictures 11–24), science-fiction art of the Lisa era (31–41), and *2001: A Space Odyssey* (51–63). Any one of them is a complete installation on its own.

- **Base floppy rebuilt** with the 1.1 tool, the nine-picture starter show, and LISACom 1.1.

- **Sources updated** on GitHub, with a third hard-won lesson for Lisa Pascal programmers: identifiers are significant only to their first eight characters.

- Verified on a Lisa 2/10 (internal and external ProFile) and a LisaFPGA.

github.com/GyroPilot/AtkinsonPoint · github.com/GyroPilot/Apple-LISACom

What is the format of a .PIX file?