Simplicity is not laziness. It is mercy

#include <sys/syscall.h>

        .section .text
        .globl _start
_start:
        mov SYS_write, %g1  // system call to print a string
        mov 1, %o0          // stdout
        set message, %o1    // text to print
        mov 14, %o2         // how many bytes
1:      ta  0               // syscall

        mov SYS_exit, %g1   // system call to finish the program
        mov 0, %o0          // status code
2:      ta  0               // syscall

message:
        .string "Hello, world!\n"

$ cc -E hello.S | as -o hello.o -

$ ld -static -nopie hello.o -o hello

$ size hello
text	data	bss	dec	hex
75	0	0	75	4b

        // Mark this binary as being built specifically for OpenBSD.
        .section ".note.openbsd.ident", "a"
        .p2align 2
        .long   8, 4, 1
        .ascii  "OpenBSD\0"
        .long   0

        // List of allowed syscalls.
        .section ".openbsd.syscalls"
        .p2align 2
        .long   1b, SYS_write
        .long   2b, SYS_exit

$ ./hello
Hello, world!

DureMark 1.0 Results
=======================
Iterations      : 300
Execution Time  : 5.5 sec
List Workload   : 39.4%
Matrix Workload : 19.2%
State Workload  : 41.4%
-----------------------
Total Score     : 54.25 DureMark

( для юниксоидов )

$ /sbin/dmesg
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 4.0.1 (GENERIC) #0: Tue Oct  7 22:58:48 PDT 2008
        builds@wb30:/home/builds/ab/netbsd-4-0-1-RELEASE/i386/200810080053Z-obj/home/builds/ab/netbsd-4-0-1-RELEASE/src/sys/arch/i386/compile/GENERIC
total memory = 15996 KB
rbus: rbus_min_start set to 0x20000000
avail memory = 5532 KB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
mainbus0 (root)
ACPI Error (tbxfroot-0775): No valid RSDP was found [20060217]
ACPI Exception (tbxfroot-0531): AE_NOT_FOUND, RSDP structure not found - Flags=8 [20060217]
ACPI Exception (tbxface-0162): AE_NO_ACPI_TABLES, Could not get the RSDP [20060217]
ACPI Exception (tbxface-0211): AE_NO_ACPI_TABLES, Could not load tables [20060217]
ACPI: unable to load tables: AE_NO_ACPI_TABLES
cpu0 at mainbus0: (uniprocessor)
cpu0: Cyrix 486DLC (486-class)
WARNING: CYRIX 486DLC CACHE UNCHANGED.
isa0 at mainbus0
lpt2 at isa0 port 0x3bc-0x3bf irq : polled
ne0 at isa0 port 0x280-0x29f irq 9
ne0: NE2000 Ethernet
ne0: Ethernet address 00:40:05:fa:24:77
com0 at isa0 port 0x3f8-0x3ff irq 4: ns8250 or ns16450, no fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns8250 or ns16450, no fifo
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard
attimer0 at isa0 port 0x40-0x43: AT Timer
wdc0 at isa0 port 0x1f0-0x1f7 irq 14
atabus0 at wdc0 channel 0
vga0 at isa0 port 0x3b0-0x3df iomem 0xa0000-0xbffff
wsdisplay0 at vga0 kbdmux 1: console (80x25, vt100 emulation), using wskbd0
wsmux1: connecting to wsdisplay0
pcppi0 at isa0 port 0x61
pcppi0: children must have an explicit unit
midi0 at pcppi0: PC speaker (CPU-intensive output)
sysbeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
npx0 at isa0 port 0xf0-0xff
npx0: using exception 16
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
pcppi0: attached to attimer0
isapnp0: no ISA Plug 'n Play devices found
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
fd1 at fdc0 drive 1: 1.2MB, 80 cyl, 2 head, 15 sec
Kernelized RAIDframe activated
wd0 at atabus0 drive 0: <FC-1307 SD to CF Adapter V1.4>
wd0: drive supports 1-sector PIO transfers, LBA addressing
wd0: 1910 MB, 3880 cyl, 16 head, 63 sec, 512 bytes/sect x 3911680 sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
boot device: <unknown>
root device: wd0a
dump device (default wd0b): 
file system (default generic): 
root on wd0a dumps on wd0b
root file system type: ffs
init path (default /sbin/init): 
init: trying /sbin/init
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)
$ _

I'm selling one of my PDP-11/73s with "all my good parts" to cover the costs of the 11/24 I'm building. Basically, it's an infallible system as long as I stay one PDP ahead of things 🙂

Plug it in, turn it on - boot 211BSD UNIX already custom configured, serve WWW pages, FTP, Telnet, and more. This is your chance to own a maxed-out and completely turnkey, ready-to-run PDP-11 UNIX Workstation. You could also install and run RT-11 or RSX-11, but this machine has been carefully set up and configured with 211BSD UNIX, including all networking features.

This machine represents a collection of my very best PDP-11 components, including:

• DEC M8190 CPU
• DEC M8637 Fast PMI Memory (x2) for a total of 4M installed, the max permitted
• DEC M3104 Eight Port Serial Multiplex - Connect up to 9 total terminals (plus Ethernet sessions)
• DEC M7555 MFM and Floppy Controller
• Emulex UC07 SCSI Controller - Supports tapes, drives, jaz, and more, up to 6 devices - Boot multiple systems
• DEC M7516 Ethernet Adapter - The faster/better DELQA NIC
• DEC RX50 Dual Floppy Drive - Tested and mounted as /mnt/flopppy0 and /mnt/floppy1 for each file interchange
• Seagate ST43400N - 3GB SCSI Drive - Contains /root, /swap, /usr, and /data partitions

It's all housed in a rare and very nice DEC BA23 chassis and tower pedestal case with front cover plate.

• Olimex PIC32-RetroBSD
• Microchip Explorer 16

• MIPS16e - компактная система команд - не поддерживается компилятором Clang. Формально она там есть, но код генерится совершенно нерабочий. Так что приходится довольствоваться стандартным набором инструкций. Из-за этого некоторые "толстые" приложения не лезут в память, к примеру компилятор SmallerC.
• Не удаётся собрать библиотеку libc.а в формате a.out для того же компилятора SmallerC. Потому что имеющийся ассемблер mips32 не понимает некоторые навороченные конструкции, порождаемые компилятором Clang. Надо будет допиливать.

$ qemu-pic32 -machine pic32mx7-max32 -nographic -monitor none -serial stdio -bios boot-max32.hex -kernel unix.hex -sd retrobsd.img
Board: chipKIT Max32
Processor: M4K
RAM size: 128 kbytes
Load file: 'boot-max32.hex', 6720 bytes
Load file: 'unix.hex', 141140 bytes
Card0 image 'retrobsd.img', 102401 kbytes

2.11 BSD Unix for PIC32, revision G512 build 3:
     Compiled 2025-02-07 by vak@bumba:
     /home/vak/Project/BSD/retrobsd/sys/pic32/max32
cpu: 795F512L 80 MHz, bus 80 MHz
oscillator: HS crystal, PLL div 1:2 mult x20
spi2: pins sdi=RG7/sdo=RG8/sck=RG6
uart1: pins rx=RF2/tx=RF8, interrupts 26/27/28, console
uart2: pins rx=RF4/tx=RF5, interrupts 40/41/42
uart4: pins rx=RD14/tx=RD15, interrupts 67/68/69
sd0: port SPI2, pin cs=RC14
gpio0: portA, pins ii---ii-iiiioiii
gpio1: portB, pins iiiiiiiiiiiiiiii
gpio2: portC, pins i-ii-------iiii-
gpio3: portD, pins --iiiiiiiiiiiiii
gpio4: portE, pins ------iiiiiiiiii
gpio5: portF, pins --ii--------i-ii
gpio6: portG, pins iiii--i-----iiii
adc: 15 channels
pwm: 5 channels
sd0: type I, size 102400 kbytes, speed 10 Mbit/sec
sd0a: partition type b7, sector 2, size 102400 kbytes
sd0b: partition type b8, sector 204802, size 2048 kbytes
sd0c: partition type b7, sector 208898, size 102400 kbytes
phys mem  = 128 kbytes
user mem  = 96 kbytes
root dev  = (0,1)
swap dev  = (0,2)
root size = 102400 kbytes
swap size = 2048 kbytes
/dev/sd0a: 1444 files, 12342 used, 89657 free
Starting daemons: update cron 

2.11 BSD UNIX (pic32) (console)

login: root
Password:
Welcome to RetroBSD!
erase ^?, kill ^U, intr ^C

# date
Sun Jan 24 23:08:07 PST 2016

# df
Filesystem  1K-blocks     Used    Avail Capacity  Mounted on
/dev/sd0a      101999    12345    89654    12%    /

# ps aux
USER       PID NICE SZ TTY  TIME COMMAND
root         0   0   3 ?    0:00 swapper
root         1   0  35 ?    0:00 init - 
root        10   0   7 ?    0:00 update 
root        12   0  54 ?    0:00 cron 
root        13   0  39 0    0:00 -sh 
root        17   0  42 0    0:00 ps aux 

# ls /bin
[            crontab      hostname     pagesize     size         uucico
adb          date         id           passwd       sl           uuclean
adc-demo     dc           iostat       pdc          sleep        uucp
aout         dd           join         picoc        smux         uudecode
apropos      df           kill         portio       sort         uuencode
ar           diff         la           pr           split        uulog
as           diskspeed    last         printenv     strip        uuname
awk          du           lcc          printf       stty         uupoll
basename     echo         lcpp         ps           su           uuq
basic        ed           ld           pwd          sum          uusend
bc           egrep        ln           pwm          sx           uusnap
cal          emg          login        ranlib       sync         uux
calendar     env          lol          rb           sysctl       uuxqt
cat          expr         ls           re           sz           vi
cb           false        mail         renice       tail         vmstat
cc           fgrep        make         renumber     tar          w
chat-server  file         man          retroforth   tee          wall
chflags      find         md5          rev          telnet       wc
chfn         fold         med          rm           test         web-client
chgrp        forth        mesg         rmail        time         web-server
chmod        fstat        mkdir        rmdir        tip          whatis
chpass       glcdtest     more         rx           touch        whereis
chsh         globdump     msec         rz           tr           who
cmp          globread     mv           sb           true         whoami
col          globwrite    nice         scc          tsort        write
comm         grep         nm           scm          tty          xargs
compress     groups       nohup        sed          uname        zcat
cp           head         ntpdate      setty        uncompress
cpp          hostid       od           sh           uniq

# cd /share/examples/asm
# make clean
rm -f *.o ashello echo *.dis *~

# cat ashello.S
/*
 * This is an example of MIPS assembly program for RetroBSD.
 *
 * To compile this program, type:
 *  cc -c ashello.S
 *  ld ashello.o -o ashello
 */
#include <syscall.h>

        .data                               // begin data segment
hello:  .ascii  "Hello, assembly world!\n"  // a string

        .text                               // begin code segment
        .globl  start                       // entry point for ld
start:
        li      $a0, 0                      // arg 1: stdout fd
        la      $a1, hello                  // arg 2: string address
        li      $a2, 23                     // arg 3: string length
        syscall SYS_write                   // call the kernel: write()
        nop                                 // returns here on error
        nop                                 // skips two words on success

        li      $a0, 0                      // arg 1: exit status
        syscall SYS_exit                    // call the kernel: exit()
        // no return

# make ashello
cc  -c ashello.S
ld ashello.o -o ashello

# ./ashello
Hello, assembly world!

# cd /share/examples/c
# make clean
rm -f *.o *~ hello stdarg skeleton primelist primesum test1 test2 test3  gpio adc rain q8 tetris lcd6

# cat hello.c
#include <stdio.h>

int main()
{
    printf ("Hello, C World!\n");
    return 0;
}

# make hello
cc  -o hello  hello.c

# ./hello
Hello, C World!

# halt
killing processes... done
syncing disks... done
halted

FreeBSD 1.0

qemu-system-i386 \
    -cpu 486 \
    -m 64M \
    -rtc base=localtime \
    -hda freebsd1.0.qcow \
    -netdev user,id=ed1,ipv6=off,hostfwd=tcp::2222-:22 \
    -device ne2k_isa,netdev=ed1,mac=00:00:0d:31:04:11,irq=5

FreeBSD 2.0.5

qemu-system-i386 \
    -cpu pentium \
    -m 128M \
    -rtc base=localtime \
    -hda freebsd2.0.5.qcow \
    -hdb hdb.qcow \
    -hdc hdc.qcow \
    -hdd hdd.qcow \
    -netdev user,id=ed1,ipv6=off,hostfwd=tcp::2222-:22 \
    -device ne2k_isa,netdev=ed1,mac=00:00:0d:31:04:11,irq=5

dmarck

wget https://download.freebsd.org/releases/ISO-IMAGES/14.2/FreeBSD-14.2-RELEASE-arm-armv7-GENERICSD.img.xz

wget https://pkg.freebsd.org/FreeBSD:14:aarch64/latest/All/u-boot-olinuxino-lime2-2024.07.pkg

tar xf u-boot-olinuxino-lime2-2024.07.pkg 
mv usr/local/share/u-boot/u-boot-olinuxino-lime2/u-boot-sunxi-with-spl.bin .

dd if=u-boot-sunxi-with-spl.bin of=/dev/diskN bs=1k seek=8 conv=sync