CAOTD (*): JavaScript is the new Assembly

CPallini

Well, it is a scripting language, after all: the one having even the very name misleading. :-D

Veni, vidi, vici.

CPallini

Amitosh S.M. wrote:

blueprints

Blueprints? :-)

Veni, vidi, vici.

Marc Clifton

Amitosh S.M. wrote:

If I had a time machine, I would have gone to past and burnt the blueprints!!!

I would go back even further and burned the original implementation of HTML! Marc

Day 1: Spider Database Navigator Unit Testing Succinctly

Roger Wright

Okay, BASIC I'll go for, but don't impugn Assembly. It takes far more knowledge of hardware, and programming skill, to build a useful program using Assembly than any of the modern languages. And yes, sometimes it has to be done...

Will Rogers never met me.

Lost User

Does this assembly stuff look like this? :)

; =========================================================================================
; Parameters:
; RE.0 X coordinate of the sprite
; RE.1 Y coordinate of the sprite
; RF Pointer to sprite
; RD Size of the sprite in bytes
;
; Internal:
; RC Pointer to video memory
; =========================================================================================

DrawSprite: DEC R2
LDI hi(DisplayBuffer) ; calculate the offset in the video buffer
PHI RC ; DisplayBuffer + Y * 8 + X / 8
GHI RE ; result goes to RC

		IF Resolution == 20H
		ANI  1FH			; between 0 - 31
		ENDIF
			
		IF Resolution == 40H
		ANI  3FH			; or 0 - 63
		ENDIF

		IF Resolution == 80H
		ANI  7FH			; or 0 - 127
		ENDIF

		SHL
		SHL
		SHL
		PLO  RC
		BNF  DSP\_SkipIncrement
		GHI  RC
		ADI  01H
		PHI  RC

DSP_SkipIncrement: GLO RC
STR R2
GLO RE
ANI 3FH
SHR
SHR
SHR
ADD
PLO RC
GLO RE ; calculate the number of required shifts
ANI 07H ; result to RE.1, replacing the Y coordinate
PHI RE ; RE.0 will be used later to count the shifts

DSP_ByteLoop: GLO RD ; exit if all bytes of the sprite have been drawn
BZ DSP_Exit

		IF Resolution == 20H		; or if we are about to draw outside the video buffer
		LDI  hi(DisplayBuffer)		; only one page at 64 x 32
		ENDIF

		IF Resolution == 40H
		LDI   hi(DisplayBuffer) + 1	; two pages at 64 x 64
		ENDIF

		IF Resolution == 80H
		LDI   hi(DisplayBuffer) + 3	; four pages at 64 x 128
		ENDIF

		STR  R2
		GHI  RC
		SD
		BNF  DSP\_Exit
		LDN	 RF			; load the next byte of the sprite into RB.0
		PLO  RB
		LDI  00H		; set RB.1 to OOH
		PHI  RB
		DEC  RD				; decrement the sprite's byte counter
		INC  RF				; increment the pointer to the sprite's bytes
		GHI  RE				; prepare the shift counter
		PLO  RE

DSP_ShiftLoop: GLO RE ; exit the loop if all shifts have been performed
BZ DSP_ShiftExit
DEC RE ; decrement the shift counter
GLO RB ; shift the values in RB
SHR
PLO RB
GHI RB
RSHR
PHI RB
BR DSP_ShiftLoop
DSP_ShiftExit: SEX RC ; store the shifted bytes in the video buffer
GLO RB
XOR
STR RC
INC RC
GHI RB
XOR
STR RC
SEX R2
GLO RC ; advance the video buffer pointer to the next line
ADI 07H
PLO RC
GHI RC
ADCI 00H
PHI RC
BR DSP_ByteLoop
DSP_Ex

Roger Wright

Yup.. That's the stuff. :-D

Will Rogers never met me.

Lost User

Ahh, good morning (at leat it is early morning here). I got this drivel from here[^]. While I don't enjoy JavaScript very much, I still have some assembly which I occasionally work on. The code I have posted is used to draw a bitmap patten at any screen coordinates. I use it for text output, but also can be used to draw sprites in a game. That's why ther also collison detection. :)

Sent from my BatComputer via HAL 9000 and M5

Rob Grainger

In the UK they are planning plain packaging on cigarette packets - just think of all the extra space for sketching designs such as these.

"If you don't fail at least 90 percent of the time, you're not aiming high enough." Alan Kay.

Rob Grainger

Hear hear! (I could go into a similar rant about failing to learn from existing technologies to my SQL one they other day. In this case forerunners such as Doug Englebart (The Mother of all Demos), Ted Nelson (who coined the phrase Hypertext) and Apple's HyperCard. They really should stop these scientists hacking.

"If you don't fail at least 90 percent of the time, you're not aiming high enough." Alan Kay.

CPallini

E. Majorana would have been happy.

Veni, vidi, vici.

Andrei Straut

CDP1802 wrote:

allows any {place insulting word of choice here]

I believe that code block is not properly closed. I don't think you would want to debug that kind of error in a Javascript file...

This isn't a signature

Marc Clifton

Rob Grainger wrote:

and Apple's HyperCard.

I actually wish HyperCard was still around - I guess we have PowerPoint nowadays, but it's really not the same thing. One day I'll get back to working on http://app.intertexti.com/[^], my resurrection attempt (sort of.) ;) Marc

Day 1: Spider Database Navigator Unit Testing Succinctly

KP Lee

CPallini wrote:

Blueprints?

Something used in Medieval times (My sophomore year of college) to make inexpensive copies of plans. Huge sheets of paper were used to create drawings of a design. (Written by hand, in pencil. Computers did exist, but were rather mythical. The head office was rumored to have one!) Another sheet the same size was immersed in chemicals was placed up to the plan, a special light was shined through both. The pencil marks blocked the light, the rest of the paper reacted to the light and turned blue, while the blocked portions remained white. In ancient times, this was the way structures were built. To this day, any kind of plan in any kind of medium is still called a blueprint by a fair segment of the population. (Mostly by people who have actually seen a blueprint or were infected by the people who still call it that.)

KP Lee

Marc Clifton wrote:

I would go back even further

Hate to tell you this, but blueprints predate HTML about a hundred years. You would have to go back even sooner.

CPallini

I know that. However it would imply there were a plan behind JavaScript. :-D

Veni, vidi, vici.

Marc Clifton

KP Lee wrote:

but blueprints predate HTML about a hundred years.

Harhar. Well, then we might as well go back to the discovery of the wheel. Or better yet, fire. ;) Marc

Day 1: Spider Database Navigator Unit Testing Succinctly

KP Lee

Andrei Straut wrote:

I believe that code block is not properly closed

For a computer compiler probably, but even there you could code "{]" or "[}" as a pair of opening and closing braces.

KP Lee

There definitely were plans behind JavaScript, but then you got people like me with no object oriented training picking it up and using it. Worked fine for what I needed, didn't even need to recognize there was OOP intent in the design.

KP Lee

Sorry, misstated that, I intended that when you were moving back in time you would have to hit the breaks sooner to hit just before HTML. IE less distance back in time, not more. I may have also totally misread what you said. By the way, since you want something better than HTML at a time when HTML was a trailblazing concept, how would you go about convincing the designer "your" idea is better?

BotReject

I think that's why I like JS so much - it reminds me of the C64. However, I wouldn't use it for large applications, but scripts of a few hundred or thousand lines or so are fun to code in JS. I like OOP too, though I often think it's an overkill on simple scripts. I suppose as a hobbyist I don't have to deal with a hundred thousand lines plus of code, which would probably change my perspective.