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TITLE (ROM BIOS FOR IBM PERSONAL COMPUTER)
.MODEL COMPACT
OPTION M510
;-------------------
;EQUATES
;-------------------

PORT_A          EQU     60H             ;8255 PORT A ADDR
PORT_B          EQU     61H             ;8255 PORT B ADDR
PORT_C          EQU     62H             ;8255 PORT C ADDR

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package main

import (
	"net/url"
	"regexp"
	"strings"
)

// URLRewriter rewrites URL
type URLRewriter struct {

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package router

import "strings"

type trie struct {
	root trieNode
}

func newTrie() *trie {
	return &trie{

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Filling an array or slice with a repeated pattern

Looking for an efficient pure GO approach to copy repeating patterns into a slice, for a toy project, I ran a few tests and discovered a neat approach to significantly improve performance. For the toy project, I am using this to fill a background buffer with a specific RGB color pattern, so improving this performance significantly improved my acheivable framerate.

All the test were run with a buffer of 73437 bytes, allocated as follows

var bigSlice = make([]byte, 73437, 73437)

Fill the slice with the value 65 by looping through each element and setting the value

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type fixed32 int32

func fromFloat32(f float32) fixed32 {
	return fixed32((f * float32(1<<16)) + 0.5)
}

func (f fixed32) Float32() float32 {
	return float32(f) / float32(1<<16)
}

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# Enable Nested Virtualization
Set-VMProcessor -VMName <your-vm-name> -ExposeVirtualizationExtensions $true

# Set the network adapter for the nested VM by enabling mac address spoofing
Get-VMNetworkAdapter -VMName <your-vm-name> | Set-VMNetworkAdapter -MacAddressSpoofing On

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heap_start        .equ  0x9000      ; Starting address of heap
heap_size         .equ  0x0100      ; Number of bytes available in heap

      .org 0
      jp    main


      .org  0x100
main:
      ld    HL, 0x8100

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        SLDOPT COMMENT WPMEM, LOGPOINT, ASSERTION
        DEVICE ZXSPECTRUMNEXT
        CSPECTMAP "demo.map"

        org  $8000

        macro farcall fn
                ld a, $$fn
                call farstub
                dw fn

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        SLDOPT COMMENT WPMEM, LOGPOINT, ASSERTION
        DEVICE ZXSPECTRUMNEXT
        CSPECTMAP "ctctest.map"

        org $8000

ctc0    equ $183b
main:
        nextreg 7,0     ; set speed

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        SLDOPT COMMENT WPMEM, LOGPOINT, ASSERTION
        DEVICE ZXSPECTRUMNEXT
        CSPECTMAP "mousedemo.map"

        org  $8000

MouseMinX equ 0
MouseMaxX equ 319
MouseMinY equ 0
MouseMaxY equ 255