5 ms·

B2fJ – A Java Virtual Machine to run on the 8-bit home computers of the 80s

to3m 9y ago
See also this, which is (as far as I can tell) the JVM for the Apple II: http://forum.6502.org/viewtopic.php?f=2&t=2224&p=20418 http://forum.6502.org/viewtopic.php?f=2&t=2224&p=20418
Rjevski 9y ago
Java on Sega Genesis/MegaDrive: https://www.mikekohn.net/micro/sega_genesis_java.php https://www.mikekohn.net/micro/sega_genesis_java.php
- pvg 9y ago
  That's a very different thing, though - a native compiler targeting a 68k (decadent luxury!), rather than a JVM on a 6502.
- nsxwolf 9y ago
  "I keep getting asked why I'm programming for a Sega Genesis system in Java, the reason is I'm hoping someone from Sega or Sun Microsystems finds this page and offers me a job." "Posted: November 17, 2015" Oh man... I think he's been trapped in a hole coding for a very long time... Should I tell him or should you?
  - MrBuddyCasino 9y ago
    I was hoping he was being sarcastic. Oh boy. Impressive technical achievement though.
majidazimi 9y ago
In the mean time, I'm struggling to open Atom on an i7 processor with 16GB of memory.
- LeonM 9y ago
  You'll probably get downvoted, but I can't help having the same thoughts when reading a headline like this
- pjmlp 9y ago
  And even Swing allows for better OS integration than a plain Webview.
- Chyzwar 9y ago
  Nobody force you to use Atom. In fact, there are half dozen alternatives that are faster and feature complete.
- sogen 9y ago
  I feel you bro' I remember browsing with 16 MB of memory... and it still feels the same, specially now with Chrome hogging the fan, CPU and mouse...
_Codemonkeyism 9y ago
"Preemptive threads with synchronization." From working in 6502 asm in the 80s on a c64 I must say: Most astonishing.
- dmitrygr 9y ago
  In an interpreter, appearing to do threads is easy. Just interpret some instructions from one "thread", then some from next, etc
  - greenshackle2 9y ago
    That's pretty much what Python does, no?
Bjornskjald 9y ago
But can it run Doom?
- poizan42 9y ago
  Kinda sorta depending on what you think of as a C64 and what you think of as Doom. Proper Doom on extended C64: https://www.youtube.com/watch?v=7ZzivzuDOls https://www.youtube.com/watch?v=7ZzivzuDOls - even then the framerate is horrible. Doom with heavily simplified graphics and stuff (M.O.O.D. Doom) on a proper C64: https://www.youtube.com/watch?v=YQcK527rYJI https://www.youtube.com/watch?v=YQcK527rYJI
- reaperducer 9y ago
  If an Atari 2600 can run Halo, why not? https://en.wikipedia.org/wiki/Halo_2600 https://en.wikipedia.org/wiki/Halo_2600
minxomat 9y ago
Modern JVM, for modern 8bits AVRs: http://dmitry.gr/index.php?r=05.Projects&proj=12.%20uJ%20-%20a%20micro%20JVM http://dmitry.gr/index.php?r=05.Projects&proj=12.%20uJ%20-%2...
- dmitrygr 9y ago
  That can be build for c64 easily and thus give you support of garbage collection, threads, arrays, and well, all of java
Koshkin 9y ago
Java fell into a disrespect among much of the younger crowd to a considerable degree - in contrast to the almost universal excitement about it some 20 years ago. But I still find it an amazing, very well-engineered, extremely versatile platform that works on large machines and tiny microcontrollers alike and is easy to extend to new devices!
- mpweiher 9y ago
  The excitement wasn't all the universal. I remember we advertised our CMS as "100% Java- and JavaScript-free" ;-)
- CyberDildonics 9y ago
  You find Java well engineered or you find the JVM well engineered? Java may go down in history for the most destructively designed programming language ever created. The entire standard library and methodology is to create every little piece of data on the heap, then use extremely deep inheritance as a substitute for the ability to write generic software pieces. Not only is the "Object Oriented" way of doing things arguably a blight on software design, both allocation and chasing of virtual pointers are devastating to modern performance. Then to combat this, the JVM is an engineering marvel that has matured over 20 years.
  - merb 9y ago
    well the jvm is actually making the whole allocations a little bit better with upcoming vm's. and that's exactly the problem it just takes too long for a new java release.
  - bsder 9y ago
    > Not only is the "Object Oriented" way of doing things arguably a blight on software design, both allocation and chasing of virtual pointers are devastating to modern performance. Um, this is not unique to Java, you know. Even C++ does this.
    - CyberDildonics 9y ago
gururise 9y ago
Really cool! Wish floating point was working though... software float can be useful!
gururise 9y ago
Anyone know of a Java VM that works on Arduino?
- opless 9y ago
  http://dmitry.gr/index.php?r=05.Projects&proj=12.%20uJ%20-%20a%20micro%20JVM http://dmitry.gr/index.php?r=05.Projects&proj=12.%20uJ%20-%2...

to3m 9y ago

See also this, which is (as far as I can tell) the JVM for the Apple II: http://forum.6502.org/viewtopic.php?f=2&t=2224&p=20418 http://forum.6502.org/viewtopic.php?f=2&t=2224&p=20418

Rjevski 9y ago

Java on Sega Genesis/MegaDrive: https://www.mikekohn.net/micro/sega_genesis_java.php https://www.mikekohn.net/micro/sega_genesis_java.php

pvg 9y ago
That's a very different thing, though - a native compiler targeting a 68k (decadent luxury!), rather than a JVM on a 6502.
nsxwolf 9y ago
"I keep getting asked why I'm programming for a Sega Genesis system in Java, the reason is I'm hoping someone from Sega or Sun Microsystems finds this page and offers me a job." "Posted: November 17, 2015" Oh man... I think he's been trapped in a hole coding for a very long time... Should I tell him or should you?
- MrBuddyCasino 9y ago
  I was hoping he was being sarcastic. Oh boy. Impressive technical achievement though.

majidazimi 9y ago

In the mean time, I'm struggling to open Atom on an i7 processor with 16GB of memory.

LeonM 9y ago
You'll probably get downvoted, but I can't help having the same thoughts when reading a headline like this
pjmlp 9y ago
And even Swing allows for better OS integration than a plain Webview.
Chyzwar 9y ago
Nobody force you to use Atom. In fact, there are half dozen alternatives that are faster and feature complete.
sogen 9y ago
I feel you bro' I remember browsing with 16 MB of memory... and it still feels the same, specially now with Chrome hogging the fan, CPU and mouse...

_Codemonkeyism 9y ago

"Preemptive threads with synchronization." From working in 6502 asm in the 80s on a c64 I must say: Most astonishing.

dmitrygr 9y ago
In an interpreter, appearing to do threads is easy. Just interpret some instructions from one "thread", then some from next, etc
- greenshackle2 9y ago
  That's pretty much what Python does, no?

Bjornskjald 9y ago

But can it run Doom?

poizan42 9y ago
Kinda sorta depending on what you think of as a C64 and what you think of as Doom. Proper Doom on extended C64: https://www.youtube.com/watch?v=7ZzivzuDOls https://www.youtube.com/watch?v=7ZzivzuDOls - even then the framerate is horrible. Doom with heavily simplified graphics and stuff (M.O.O.D. Doom) on a proper C64: https://www.youtube.com/watch?v=YQcK527rYJI https://www.youtube.com/watch?v=YQcK527rYJI
reaperducer 9y ago
If an Atari 2600 can run Halo, why not? https://en.wikipedia.org/wiki/Halo_2600 https://en.wikipedia.org/wiki/Halo_2600

minxomat 9y ago

Modern JVM, for modern 8bits AVRs: http://dmitry.gr/index.php?r=05.Projects&proj=12.%20uJ%20-%20a%20micro%20JVM http://dmitry.gr/index.php?r=05.Projects&proj=12.%20uJ%20-%2...

dmitrygr 9y ago
That can be build for c64 easily and thus give you support of garbage collection, threads, arrays, and well, all of java

Koshkin 9y ago

Java fell into a disrespect among much of the younger crowd to a considerable degree - in contrast to the almost universal excitement about it some 20 years ago. But I still find it an amazing, very well-engineered, extremely versatile platform that works on large machines and tiny microcontrollers alike and is easy to extend to new devices!

mpweiher 9y ago
The excitement wasn't all the universal. I remember we advertised our CMS as "100% Java- and JavaScript-free" ;-)
CyberDildonics 9y ago
You find Java well engineered or you find the JVM well engineered? Java may go down in history for the most destructively designed programming language ever created. The entire standard library and methodology is to create every little piece of data on the heap, then use extremely deep inheritance as a substitute for the ability to write generic software pieces. Not only is the "Object Oriented" way of doing things arguably a blight on software design, both allocation and chasing of virtual pointers are devastating to modern performance. Then to combat this, the JVM is an engineering marvel that has matured over 20 years.
- merb 9y ago
  well the jvm is actually making the whole allocations a little bit better with upcoming vm's. and that's exactly the problem it just takes too long for a new java release.
- bsder 9y ago
  > Not only is the "Object Oriented" way of doing things arguably a blight on software design, both allocation and chasing of virtual pointers are devastating to modern performance. Um, this is not unique to Java, you know. Even C++ does this.
  - CyberDildonics 9y ago

gururise 9y ago

Really cool! Wish floating point was working though... software float can be useful!

gururise 9y ago

Anyone know of a Java VM that works on Arduino?

opless 9y ago
http://dmitry.gr/index.php?r=05.Projects&proj=12.%20uJ%20-%20a%20micro%20JVM http://dmitry.gr/index.php?r=05.Projects&proj=12.%20uJ%20-%2...