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chacking21 @magazines
20 Hits, Last modified: 8 years ago
he code that follows the STA SCROLY command using self-modifying code techniques. When the STA SCROLY happens, the... in the FLI routine (before the STA SCROLY) using self-modifying code. Here is the relevant source code which take... at $4000 sta $ff00 1$: ldy #$00 ldx #$07 ; Use self-modifying code to create three ; Point #5 mark1: lda $4000 ... s available, and what the routines do, is handy. Self-modifying code comes in handy when large portions of code c
the_secret_of_fast_lzw_crunching @base
16 Hits, Last modified: 8 years ago
rts </code> Wow, this would be great! Just some self-modifying code at the "loop" label, and we are set. However... $AE STA ENDE+1 ; some tiny self modifying code here, LDA #$00 ; in order to re... STA $AE ; memory zp locations ($00ae/af ) using self modifying code LDA #$00 ; attention Self modifying code STA $AF LDY #$00 STY $01
chacking13 @magazines
9 Hits, Last modified: 8 years ago
ine to `unroll' the graphics updating loop using self-modifying code , resulting in speed increases. Here's a s... lda $ffff,y dummy sta $ffff,y; This is the self-modifying code to draw the ; backdrop... fill 24 characters. twain lda $ffff,y; Self-modifying code used here to draw the
discovery3 @magazines
9 Hits, Last modified: 8 years ago
. GONE is used to execute tokens. Before modifying these vectors, keep in mind that many programs, s... xperienced programmer should find the words to be self-evident in the context which they are used. [Mix... o disk. 2) Analysing the loader. 3) Modifying the loader and pulling the files off tape. ... onal" as well as the casual cracker. Chapter 3: Modifying the loader and pulling the files off tape. ------
chacking8 @magazines
8 Hits, Last modified: 8 years ago
in a lot of ways. For one thing it could be made self-modifying. All variables could be stored in zero page. In ... t) The point here is that it's fast. If you use self-modifying code, you can get this down to 15 cycles per poin... ruction.below.doesn't.work...Somehow *.the.RTS.is.modifying.X.and.Y??? *.TAY..;Store.in.Y STA TY1 RTS ;I.h... ith minimal delay (maximal responsiveness). This self-bootstrapping user process concept comes from my
chacking10 @magazines
8 Hits, Last modified: 8 years ago
installing itself. But in its robustness it uses self-modifying code to store the original interrupt routine addr... nop nop nop oldirq = * + 1 ; Placeholder for self-modifying code jmp * ; Return to the original int... full 1 Full +---+ | 2 | Overrun*: Self-clearing** +---+ ------------------------- ... 1 Error +---+ | 1 | Framing Error*: Self-clearing** +---+ ----------------------------
chacking17 @magazines
8 Hits, Last modified: 8 years ago
on't ask questions! Better than a huge rewrite of self-modifying code. Wrapping up: With the above fix in place... with one hitch. The whole tech-tech routine uses self-modifying code all over the place. The modifying instructions immediately follow the routine, and ... , providing you didn't give a hang about your own self respect. The 8563 designer mentioned that the bl
chacking16 @magazines
7 Hits, Last modified: 8 years ago
routine. It just blasts into the bitmap, * with self-modifying code determining the entry and * exit points. * F... JMP FILLMAIN ;166 bytes As before, self-modifying code is used to determine the entry and exit poin
common_pitfalls @base
6 Hits, Last modified: 8 years ago
== The 6502 has always been a popular target for self-modifying code. It doesn't have a cache, and in many Situations, self-modifying code is faster then indirect Addressing modes. Even Commodore used self-modifying Code to read Basic-Tokens. Most of the time, the
chacking18 @magazines
6 Hits, Last modified: 8 years ago
e VLIR application on a 5 1/4 disk. I did this by modifying the VLIR table as to include that PRG file as a V... een using to patch geoWrite 128 v2.1 to a v2.2 by modifying VLIR #0 and #5. I haven't touched other modules y... dBTable would be shared by other requestors, some modifying code was used. The routine modifies the dBTable w... of information. For the name, "DEBRIS.SRF" (for self-running FLI) works. If you listed "FLIview" you
discovery1 @magazines
6 Hits, Last modified: 8 years ago
t again > sta $01 > inc selfmod+1 ; self-modifying code!!! >selfmod lda #$xx ; #$xx = this is the ... ould normally be device 9). CONF is also great at modifying CP/M itself when needed. I recall one time when
practical_memory_move_routines @base
5 Hits, Last modified: 8 years ago
TS </code> Even more speed can be gained by using self-modifying code, i.e. replacing the (ZeroPage),Y addressing ... dditional cycles from the added instructions that self-modify the code, but the self-modification occurs only once, and therefore adds these cycles to total n... r of cycles per byte moved. As always, the instructions that are self-modified can't be located in ROM.
chacking15 @magazines
5 Hits, Last modified: 8 years ago
uld have to do it every time I use another mouse. Modifying the keyboard seemed impracticable, so I decided ... opics as X1541 transferring and amaze your self with articles like how to connect a joypad... guys in California figured out how to make a self booting cartridge out of it and sent me a Blazin' Forth self bootable cartridge. That was really nice. There
ax_tinyrand8 @base
4 Hits, Last modified: 18 months ago
his version stores the seed as arguments and uses self-modifying code and requires only 15 bytes for the random fu... his version stores the seed as arguments and uses self-modifying code ;; The name AX+ comes from the ASL, XOR and
double_irq_explained @base
4 Hits, Last modified: 8 years ago
mulator when we leave the routine. The wonders of self-modifying code. <code> .pc = $0801 :BasicUpstart(main) .... //Registers [4] sty resety1 //using self modifying code [4] lda #<irq2 //Set IRQ Vector
making_stable_raster_routines @base
4 Hits, Last modified: 8 years ago
x_abc_random_number_generator_8_16_bit @base
4 Hits, Last modified: 19 months ago
chacking_toc @magazines
4 Hits, Last modified: 8 years ago
chacking9 @magazines
4 Hits, Last modified: 8 years ago
chacking12 @magazines
4 Hits, Last modified: 8 years ago
flexible_32_sprite_multiplexer_2 @base
3 Hits, Last modified: 8 years ago
freeload_v5.0_saver @base
3 Hits, Last modified: 8 years ago
chacking5 @magazines
3 Hits, Last modified: 8 years ago
6502_registers @base
2 Hits, Last modified: 8 years ago
decoding_bitstreams @base
2 Hits, Last modified: 8 years ago
dots_and_plots @base
2 Hits, Last modified: 4 months ago
double_irq @base
2 Hits, Last modified: 8 years ago
freedirectional_scrolling_using_map_dumps @base
2 Hits, Last modified: 8 years ago
generating_approximate_sines_in_assembly @base
2 Hits, Last modified: 6 years ago
junk_modes @base
2 Hits, Last modified: 8 years ago
kernal_floating_point_mathematics @base
2 Hits, Last modified: 3 years ago
opening_up_the_borders_-_a_further_explanation @base
2 Hits, Last modified: 7 years ago
chacking7 @magazines
2 Hits, Last modified: 8 years ago
chacking20 @magazines
2 Hits, Last modified: 8 years ago
start.txt ยท Last modified: 2021-06-10 13:37 by ftc

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