Author Topic: King's Quest 4 - Did you know they replaced background pictures??  (Read 2472 times)

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Offline lance.ewing

Re: King's Quest 4 - Did you know they replaced background pictures??
« Reply #15 on: January 30, 2025, 03:37:08 PM »
I get an error trying to run it in scummvm: "WARNING: AgiLoader_A2: disk 5 not found!"
Do you have a copy which scummvm can run?

I assume we have the same copy, as my one also doesn't work in scummvm. It does run in the Apple II emulator I'm using though (JACE).


Offline pmkelly

Re: King's Quest 4 - Did you know they replaced background pictures??
« Reply #16 on: January 31, 2025, 01:50:36 AM »
Jeff Stephenson discusses how he ported the AGI interpreter to the Apple IIe at 55:00 in the following interview:

https://youtu.be/K3s0nW1FBN8?si=0iYqh4iMUEm8Vnkz&t=3300

Offline lance.ewing

Re: King's Quest 4 - Did you know they replaced background pictures??
« Reply #17 on: January 31, 2025, 09:32:38 AM »
Yeah, I've listened to that one a few times over the past couple of years. It's great, especially the early stuff about the King's Quest project.

The Apple IIe was supposedly released at the start of 1983, when the King's Quest IBM PCJR project was in its early days. Sierra had obviously created a lot of Apple II games before that, but it would have been the older models. The Apple II+ supported up to 64K, which would have ruled it out, but with the IIe supporting more memory, it opened the door to Jeff trying to squeeze it in. It is interesting what he mentions about the first 256 bytes of memory. I don't know much about the Apple IIe yet but I plan to one day disassemble the 6502 code for the Apple IIe AGI interpreter to see how it works, which would be a first step towards potentially writing something for another 6502 based machine. Some sort of similar memory bank switching mechanism would need to be used, as the standard 6502 can only address 64K.


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