neuro-sys

Write a For-Loop in Z80 Assembly

Note, this is intended for a beginner (as I was at the time when I wrote this) who thinks in terms of high level languages.

Firstly, it's best to type down what exactly we'd like to write in a higher level language:

int i;

for ( i = 0 ; i < 10 ; i++ ) {

neuro-sys

; Transition effect 1

nolist
		org	#7000
		jp	start

fc		ds	1	; frame count
y1		ds	2	; y pos counter
y2		ds	2	; upper bound position
y3		ds	2	; lower bound

neuro-sys

;-----------------------------------------------------------------------------+
; Notes                                                                       |
;-----------------------------------------------------------------------------+
; - Changing R12/R13 takes affect only when C4=C9=0, but should be set
; when C4>0 for compatibility reasons.
; - Changing R4 takes effect as long as C4 > R4' (new value).
; - Vsync starts when C4=C7
;-----------------------------------------------------------------------------+

;-----------------------------------------------------------------------------+

neuro-sys

Amstrad CPC 464/6128 Programming Resources

A collection of information gathered from various resources into a single document to be able to program for Amstrad CPC 464/6128 machines.

Hardware

CPC has the following components on the mainboard:

• Z80
• CRTC HD6845

neuro-sys

#include <stdio.h>
#include <assert.h>

/*
  # Mini CPC documentation
  CPC has the following chips that are controlled via z80's in and out instructions
  - Gate Array
  - CRTC
  - 8255
  I/O Ports are documented here

neuro-sys

        kl_choke_off    equ &bcc8
        kl_rom_walk     equ &bccb
        kl_init_back    equ &bcce
        kl_log_ext      equ &bcd1
        kl_find_command equ &bcd4
        kl_new_framefly equ &bcd7
        kl_add_framefly equ &bcda
        kl_del_framefly equ &bcdd
        kl_new_fast_ticker equ &bce0
        kl_add_fast_ticker equ &bce3

neuro-sys

macro saveregs oldsp, stack
    push    af
    push    bc
    push    de
    push    hl
    push    ix
    push    iy
    ld      (oldsp), sp
    ld      sp, stack
mend

neuro-sys

Amstrad CPC and Z80 related links

Z80

• http://www.z80.info/z80code.htm
• http://www.phy.davidson.edu/FacHome/dmb/py310/Z80.Instruction%20set.pdf
• http://rvbelzen.tripod.com/z80prgtemp/z80prg03.htm
• http://www.worldofspectrum.org/Z80.html
• http://www.andreadrian.de/oldcpu/Z80_number_cruncher.html#mozTocId370017
• http://code.metager.de/source/xref/sdcc/sdcc/device/lib/z80/

Amstrad

neuro-sys

# Build stage
FROM nvidia/opengl:1.0-glvnd-devel-ubuntu20.04 as builder

# Install node 14.0
RUN apt-get update -y && \
    apt-get install -y curl gnupg ca-certificates && \
    curl -sL https://deb.nodesource.com/setup_14.x | bash - && \
    apt-get install -y nodejs

# See: https://github.com/stackgl/headless-gl#ubuntudebian

neuro-sys

Folder PATH listing
Volume serial number is 00000065 6A5C:3BBA
C:.
|   dnd.txt
|   
+---1st Edition
|   +---Accessories
|   |       tsr09293 RPGA Magic Encyclopedia Vol 1.pdf
|   |       tsr09334 - AD&D DL_-_Wild_Elves.pdf
|   |