#Tag
On recreating the lost SDK for a 42-year-old operating system: VisiCorp VisiOn
I would think most of us here at OSNews are aware of VisiOn, the graphical multitasking operating system for the IBM PC which was one of the first operating systems with a graphical user interface, predating Windows, GEM, the Mac, and even the Apple Lisa. While VisiOn was te
On recreating the lost SDK for a 42-year-old operating system: VisiCorp VisiOn
I would think most of us here at OSNews are aware of VisiOn, the graphical multitasking operating system for the IBM PC which was one of the first operating systems with a graphical user interface, predating Windows, GEM, the Mac, and even the Apple Lisa. While VisiOn was te
I heard a synthesized voice on TV this evening, and it got me thinking about S.A.M., which (who?) I first heard over forty years ago, but that intro sure takes me back (though we had the Apple ][ version).
Good, exciting times full of potential and a glimpse at future possibilities.
Found my first computer this week.
Nascom 1 (1978 ish) built into a wind up gramaphone case, swappable roms (tiny basic and a monitor IIRC) space for a Phillips EL3302 cassette player (that i also have some where) also found my software on tape.
Really need to archive those 😊
Z80 at 4Mhz , 2KB onboard 1KB video, 1K user. 4K expansion (8x 2114's)
⁂ Article
Falling down a rabbit hole of nostalgia, episode 1 - SunOS 4
(or: running SunOS 4 on an emulated SPARCstation in 2025 with QEMU 10.1.) [...]
The why of LisaGUI
LisaGUI is an amazing project that recreates the entire user interface of the Apple Lisa in the browser, using nothing but CSS, a bit of HTML, and SVG files, and it's an absolute joy to use and experience. Its creator, Andrew Yaros, has published a blog post diving into the why and how of LisaGUI.
I had been trying to think of a good project to add to my programming portfolio, which was
⁂ Article
Falling down a rabbit hole of nostalgia, episode 1 - SunOS 4
(or: running SunOS 4 on an emulated SPARCstation in 2025 with QEMU 10.1.) [...]
Found my first computer this week.
Nascom 1 (1978 ish) built into a wind up gramaphone case, swappable roms (tiny basic and a monitor IIRC) space for a Phillips EL3302 cassette player (that i also have some where) also found my software on tape.
Really need to archive those 😊
Z80 at 4Mhz , 2KB onboard 1KB video, 1K user. 4K expansion (8x 2114's)
The why of LisaGUI
LisaGUI is an amazing project that recreates the entire user interface of the Apple Lisa in the browser, using nothing but CSS, a bit of HTML, and SVG files, and it's an absolute joy to use and experience. Its creator, Andrew Yaros, has published a blog post diving into the why and how of LisaGUI.
I had been trying to think of a good project to add to my programming portfolio, which was
Z80:
modify address in register: inc hl
modify data pointed by register: inc (hl)
use constant: ld a, 42
read constant address: ld a, (42)
68k:
modify address in register: addq #1, a0
modify data pointed by register: addq #1, (a0)
use constant: move #42, d0
read constant address: move 42, d0
There's a good reason why 68k created that inconsistency around immediate data and absolute addresses, but it's annoying that I keep making mistakes when moving between CPUs
Z80:
modify address in register: inc hl
modify data pointed by register: inc (hl)
use constant: ld a, 42
read constant address: ld a, (42)
68k:
modify address in register: addq #1, a0
modify data pointed by register: addq #1, (a0)
use constant: move #42, d0
read constant address: move 42, d0
There's a good reason why 68k created that inconsistency around immediate data and absolute addresses, but it's annoying that I keep making mistakes when moving between CPUs
I need to stop inventing new #RetroComputing projects in my head.
Otherwise, I'll soon find myself coding a racing game and a vertical shooter on the #AmstradCPC
I need to stop inventing new #RetroComputing projects in my head.
Otherwise, I'll soon find myself coding a racing game and a vertical shooter on the #AmstradCPC
My system 7 project is continuing at a good clip, ps/2 keyboard input, sb16 emulation and started converting the pascal and assembly source for macpaint from Bill Atkinson to C also for inclusion #RetroComputing #macintosh #OpenSource https://github.com/Kelsidavis/System7
My system 7 project is continuing at a good clip, ps/2 keyboard input, sb16 emulation and started converting the pascal and assembly source for macpaint from Bill Atkinson to C also for inclusion #RetroComputing #macintosh #OpenSource https://github.com/Kelsidavis/System7
I am almost certainly going to add some kind of programmable computer to my game. Thinking of making it programmable with assembly and basically implementing something like a 6502 VM that runs a handful of instructions per game tick. But I'm not entirely sure whether to make it an *actual* 6502, or to just make a similar but simplified ISA
Kinda tempted to do the second one, because 1) making ISAs is fun and 2) standard 6502 assembly is ugly so I'd wanna make some changes anyway.. #gamedev
Alright I have designed a little ISA: https://gist.github.com/mortie/d678c4663fe705219e5dfe90e0bbdc3d. It's somewhat 6502-inspiret, but I think it's cute.
Not done yet, but I think it's a decent starting point. Next step: writing a VM and an assembler...
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