The ZEROEQUALS function can be replaced by:
pop ax; neg ax;sbb ax,ax;push ax
stevekemp 5 hours ago [-]
It's nice to see that has a brainfuck interpreter. I wrote a lisp compiler recently, then used that to write a lisp interpreter, and in both cases have a version of brainfuck in it.
That said interpreting the brainfuck mandelbrot program takes several hours. On an old CP/M system I have a brainfuck compiler that converts a program to Z80 machine code, and that same mandelbrot example runs in less than two seconds.
So speed isn't great, but having brainfuck really proves a toy system is "real".
Saltloaf 15 hours ago [-]
Eight primitives and a colon compiler in 512 bytes is a nice demonstration of how much you can bootstrap from almost nothing. The examples building up from there are the best part.
mjevans 9 hours ago [-]
Really shows how approachable it would have been to have just a tiny bit more added to the API of 'PC BIOS' to make for an extremely portable driver platform system to allow OS independent arbitrary hardware drivers as Forth that the system BIOS could compile at boot and run beneath the OS. Though of course the PC BIOS API from when that mattered isn't in anything like a modern protect mode operating profile.
jacquesm 9 hours ago [-]
PC BIOS was mostly just for DOS and bringup, it also helped in moving stuff across the barrier during 32 bit boot but afterwards the only thing you would normally use it for is to call hardware specific ROMs for instance for mode changes and such. The rest of the time you'd avoid it like the plague (also because of the expensive switch back to 'real' mode).
addaon 6 hours ago [-]
X86 asm as she is intended to be wrote. `repe cmpsb` for symbol table string comparison, etc.
anthk 9 hours ago [-]
I love both Forth and Lisp but SectorLisp it's far better.
Also, for a small demo, check Eforth under Subleq/Muxleq:
It's impressive what you can do in the C64 with just Forth instead of C64 Basic.
For Speccy/ZX80/ZX81, I'm pretty sure they ported the Jupyter ACE one, boosting up
the available RAM in the 48k and 128k making Basic almost obsolete in that platform.
gabrielsroka 3 days ago [-]
2020
jxnsneb 3 days ago [-]
Not that impressive considering this uses BIOS routines heavily and whole operating systems including basic interpreter fit in a couple of KiB
vrighter 12 hours ago [-]
512 bytes is quite a bit less than "a couple of kilobytes"
jacquesm 12 hours ago [-]
It's much better than 512, it fits in 336 bytes iirc.
Rendered at 21:29:04 GMT+0000 (Coordinated Universal Time) with Vercel.
The ZEROEQUALS function can be replaced by: pop ax; neg ax;sbb ax,ax;push ax
That said interpreting the brainfuck mandelbrot program takes several hours. On an old CP/M system I have a brainfuck compiler that converts a program to Z80 machine code, and that same mandelbrot example runs in less than two seconds.
So speed isn't great, but having brainfuck really proves a toy system is "real".
Also, for a small demo, check Eforth under Subleq/Muxleq:
https://github.com/howerj/subleq
edit subleq.fth/muxleq.fth and set these options to 1:
Then run this to create a new EForth image with float/do...loop and such: Subleq is the original one, muxleq it's multiplexed. The command it's the same, just replace muxleq with subleq (edit the fth file too).Usage: ./muxleq new.dec
For a brief help:
On Forth syntax, the EForth Overview PDF will be enough, except for 8086 related code, where here it's different.It's impressive what you can do in the C64 with just Forth instead of C64 Basic.
For Speccy/ZX80/ZX81, I'm pretty sure they ported the Jupyter ACE one, boosting up the available RAM in the 48k and 128k making Basic almost obsolete in that platform.