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Apple III Horses demo [message #394838] Sat, 23 May 2020 02:24 Go to next message
Rob Justice is currently offline  Rob Justice
Messages: 94
Registered: January 2013
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I spent some digging into and disassembling the classic Horses demo for the Apple ///. The main part of the code is implemented in an Invokable module written by Andy Hertzfeld. This is loaded in by the Basic program and it's functions called from there.

I found an interesting header in the invokable code file, looks like a remnant of the original source!
;----------------------------------------------------------- ------------
; "Horse Demo" Invokable Module for Business Basic
; by Andy Hertzfeld 09/04/80
;----------------------------------------------------------- -----------

Read more here in my blog post: l

And the disassembled code is on github:

This code needs to be assembled by the Apple II or /// Pascal Assembler to produce the required PCD code file.

Re: Apple III Horses demo [message #395199 is a reply to message #394838] Sun, 31 May 2020 14:53 Go to previous message
Originally posted by: wolle kemper

Thanks Rob!

I had the demo running on my Apple III a couple of years ago but lost the demo disk.

Just downloaded it and will enjoy the stunning graphic again :-)

Another example on how guys like Andy , who did understand the hardware they where working with, could do such things . At the time it was stunning :-)

PS: Same as Bill Bishop did with Applevision.
Simple through our eyes but at the time breathtaking.

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