Speccy-asm

Examples for ZX Spectrum

Examples for ZX Spectrum written in Pasmo assembler

1. Changing one color attribute
2. Blinking color attribute
3. Symbolic names in assembly sources
4. Operators in assembly sources
5. Symbolic names are usually written in uppercase
6. Generating tape image with BASIC loader (incorrect version)
7. Generating tape image with BASIC loader (correct version)
8. Counted loop to fill-in attribute memory based on JP instruction
9. Counted loop to fill-in attribute memory based on JP instruction
10. Counted loop to fill-in attribute memory based on DJNZ instruction
11. Simplified counted loop to fill-in attribute memory based on DJNZ instruction
12. Counted loop to fill-in attribute memory based on DJNZ instruction and IX register
13. Counted loop to fill-in attribute memory based on DJNZ instruction and IY register
14. Counted loop with 16-bit counter (non optimized variant)
15. Counted loop with 16-bit counter (optimized variant)
16. Counted loop with 8-bit counter (optimized variant)
17. Counted loop with 8-bit counter (optimized variant with DJNZ)
18. Clear screen and opening I/O channel #2
19. Clear screen and print character to screen
20. Clear screen and print character, ROM subroutine called via RST instruction
21. Open channel #2 to write on screen
22. Print ASCII table on screen. unoptimized version
23. Print ASCII table on screen, optimized version
24. Change character colors via control characters
25. Change character blinking attribute via control characters
26. Change text position on screen via control characters
27. Print whole string onto screen, unoptimized version
28. Print whole string onto screen, optimized version
29. Print string with changing text color
30. Print string using subroutine stored in ROM
31. Print string using attribute changed directly in memory
32. Fill-in screen by ink color
33. Fill-in screen by ink color, RET optimization
34. Fill-in screen by specified bit pattern
35. Fill-in the whole screen by ink color
36. Fill-in the whole screen by ink color, RET optimization (no return to system)
37. Fill-in the 8x8 block of pixels by constant pattern
38. Fill-in the 8x8 block of pixels by specified pattern, unoptimized variant
39. Fill-in the 8x8 block of pixels by specified pattern, optimized variant
40. Draw one selected character using own drawing routine
41. Draw any character using own drawing routine
42. Draw any character anywhere on screen using own drawing routine
43. Draw any character anywhere on screen using own drawing routine (based on RRCA instruction)
44. Draw any character anywhere on screen using own drawing routine (better solution)
45. Draw any character anywhere on screen using own drawing routine (even better solution)
46. Drawing blocky pixel of 8x1 real pixels size (no mask applied)
47. Drawing real pixel, but erasing whole 8x1 pixel block background
48. Drawing real pixel, but erasing whole 8x1 pixel block background (optimized variant)
49. Drawing real pixel, but erasing whole 8x1 pixel background (optimized variant)
50. Drawing real pixel without erasing background
51. Print ASCII table in inverse colors on screen
52. Drawing real pixel without erasing background onto screen with inverse ASCII table
53. Drawing inverse pixel without erasing background onto screen with inverse ASCII table
54. Print ASCII table in normal and also inverse colors on screen
55. Inverse pixel color (simulation of PLOT OVER statement from BASIC)
56. Print a number using standard ROM call
57. Print negative number using standard ROM call
58. Print largest supported number (9999) using standard ROM call
59. Print very large number (10000) using standard ROM call
60. Print sequence of numbers on screen
61. Print sequence of numbers on screen
62. Print flags after arithmetic operation 1+2
63. Print flags after arithmetic operation 0+0
64. Print flags after arithmetic operation 255+1
65. Print flags after arithmetic operation 254+1
66. Print flags after arithmetic operation 255+255
67. Print flags after arithmetic operation 100+100
68. Print flags after arithmetic operation 128+128
69. Print hexadecimal number (naive implementation)
70. Print hexadecimal number (naive implementation, but optimized a bit)