I downloaded "CBM prg Studio" by Arthur Jordison. I'm not tough enough to bear with the Commodore 64 editor mode, it's lovely but too quirky. Also CBM prg studio being an external IDE allows me to have all the source at a glance, shows several useful tools that surely will be handy and has the features that are needed by an ASM ide: labels, macros and automatic build.
Programming with the IDE is a breeze and you can also use it to program in basic. The tutorial shows you how to run an assembler program by using a basic code loader (the IDE generates it using one of its tools), but you can also ask the IDE to provide you with a "SYS" style execution code.
This source code create a tiny self contained C64 program that prints a white A on the top left of the screen. It's the first exercise you find in Hayden's "Commodore 64 Assembly Language Programming". Note that I decided to locate the program in memory location $0820, just a couple of bytes after the space reserved for the basic SYS statement. Before I tried to use *=C000 as a start location for for the executable, but apparently it's a bad idea since the generated program will be so large that the emulator will waste time loading it.; Exercise 1.1 *=$0820 LDA #$01 STA $0400 STA $D800 RTS ; 10 SYS 2080 *=$0801 BYTE $0E, $08, $0A, $00, $9E, $20, $32, $30, $38, $30, $00, $00, $00
The following instead is still a basic exercise, and it will print a white X on each of the four screen corners.
; Exercise 1.3 *=$0820 LDA #$18 STA $0400 STA $0427 STA $07C0 STA $07E7 LDX #$01 STX $D800 STX $D827 STX $DBC0 STX $DBE7 RTS ; 10 SYS 2080 *=$0801 BYTE $0E, $08, $0A, $00, $9E, $20, $32, $30, $38, $30, $00, $00, $00