Mikro-Assembler-FOR-VIC-20 & Built-in Machine Language Monitor
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You need to have both files loaded and I was struggling a bit here.
I almost gave up, damn it!
Because we are occupying two Memory BANKs {Blocks 3 & 5}, my VIC 20 {Emulator}
has all RAM BANKs occupied to make sure RAM won't be a problem here!
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Here is how i managed to make it work!

	1st:
	load"mikro-asm-a000",8,1 and then type SYS 40960 {for the $A000 version}
       
	2nd:  	
	load"mikro-asm-6000",8,1 

	3rd:
	RESET the computer now
	[DO NOT USE POWER CYCLE THE MACHINE form the reset menu in VICE}

	4th:
	Type SYS 40960 to start the assembly adventures!

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Now, after this is running, let's go back to business!
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** mikro  assembler **

(c) a.j.trott

24575 bytes free

ready.

list

100 *=$0340
110 lda #$6a
120 sta $900f
130 lda #$03
140 sta $0286
150 rts
ready.

assemble

* assembly complete *

start address=0340
  end address=0346

print out (y/n)? {this here didn't work! I get "OFF LINE" message}
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I will make just a quick commands listing, because there is more existing.
Wardog1UK has a GitHub site for Mikro-Assembler {Commodore C64} and all the details you might wanna
know additionally to my short command listings!

Check his sites here: https://github.com/wardog1uk/mikro/tree/main

PLEASE NOTE:
Not all that Mikro-Assembler-C64 is offering, is supported by VIC-20 version of the Assembler!

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My part, the basic's, to get you started 
{I will probably extend this sooner or later with some additional code}


ASSEMBLER: 
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ASSEMBLE 	- assemble the source code		{ASSEMBLE} will compile the source code
AUTO 		- automatically provide line numbers	{AUTO 160,10} will start from 160,170 etc..

DELETE 		- remove specified lines		{DELETE 10-100, DELETE -100, DELETE 500-}
							{Not really VIC-20 friendly!}
  							{can be executed, but nothing is deleted}			
FIND 		- display lines containing some text	{FIND $ab, FIND jmp}, search & find
FORMAT 		- display the formatted source code	{FORMAT} listing with highlighted labels

NUMBER 		- display a number in different formats {NUMBER $@%} $0340, @116, %00111100, 256, label
							number $100
						result:	hex=$0100
							dec= 256
							oct=@000400
							bin=%0000000100000000

TIM 		- start the machine code monitor	{Machine Language Monitor}
							tim
 						result:	call @ a35b
  							irq  sr ac xr yr sp
							.;eabf 4d 00 4d 42 fb
							.?
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MACHINE CODE MONITOR: {Type TIM to start it}
{These are practically standard ML-Monitor commands}
{I have mentioned the usage related to other ML-Monitor already several times}
{just notice how the command syntax isn't always the same}
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D 	0340 0350		{show listing of the assembly code in this range}
G 	0340			{execute the code}
H 	0340 0400 ab 1d		{hunt for the bytes}
L 	load"bronco",08		{will load "bronco"},{don't load BASIC programs with this!}
M 	0340 0350		{will list 16 bytes of memory locations}
R	R			{let me see the register status}
S 	S "0:game",08,0801,0900 {save the area under the name "game". end address should usually be +1}
T 	T 1000 1200 1201	{transfer the content between  A and B to C{start address}}
X
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26.05.2026

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INTERESTING IS:

When all RAM BANKS are occupied, the SCREEN ADDRESS is usually relocated to $1000, dec 4096
HOWEVER, Mikro Assembler sets this obviously back to $1e00, dec 7680

Can be seen here:

@012345678
m 1e00 1e08
.: 1e00 00 30 31 32
.: 1e04 33 34 35 36
.: 1e08 37 38 20 20
x
ready.
list

100 *=$0340
110 lda #$6a
120 sta $900f
130 lda #$03
140 sta $0286
150 ldx #$00
160 hop lda #$05
170 sta $1e00,x
180 inx
190 cpx #$16
200 bne hop
210 rts
ready.