BalorPrice
/ simple_scroll.asm
Last active
March 13, 2023 22:55
Simple ZX Spectrum scroller - amended from John Metcalf's 69-byte scroller
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| org 32768 | |
| init_scroll: | |
| ld hl,message-1 ; set to refresh char on first call | |
| ld (scroll_pos),hl | |
| ld hl,pix_count ; variable to check if new character needed | |
| ld (hl),1 | |
| ret | |
| update_scroll: |
BalorPrice
/ SID test 2 20170524.asm
Last active
May 29, 2017 09:10
SAM coupé conversion of SID test in C64 user manual
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| ; +++++++++++++++++++++ | |
| ; SID TEST 2: 24-May-17 | |
| ; +++++++++++++++++++++ | |
| ; Straight conversion of the C64 user manual example of playing a single-channel tune. | |
| ; Original program from http://www.lemon64.com/manual/manual/8_1.html | |
| ; Compiled with PYZ80 | |
| dump 1,0 | |
| autoexec |
BalorPrice
/ SID test 3 28 May 2017.asm
Last active
May 29, 2017 12:59
SAM coupé conversion of One-Page BASIC SID Benchmark in Plogue R&D
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| ; +++++++++++++++++++++ | |
| ; SID TEST 3: 28-May-17 | |
| ; +++++++++++++++++++++ | |
| ; Conversion of one-page basic SID benchmark by Plogue R&D | |
| ; http://ploguechipsounds.blogspot.co.uk/2010/05/one-page-basic-sid-benchmark.html | |
| ; Compiled with PYZ80 | |
| dump 1,0 | |
| autoexec |
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| ; MATHS ROUTINES | |
| ;-------------------------------------------- | |
| math.multDEBC: | |
| ; Input: DE = Multiplier, BC = Multiplicand | |
| ; Output: DE:HL = Product | |
| ; By Baze of 3SC. http://map.grauw.nl/sources/external/z80bits.html | |
| ld hl,0 | |
| sla e | |
| rl d |
BalorPrice
/ rotation.asm
Created
October 3, 2018 20:38
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| ; Example of rotation in Mode 4 for the SAM Coupé | |
| inc_d: equ &14 | |
| inc_e: equ &1c | |
| dec_d: equ &15 | |
| dec_e: equ &1d | |
| ;---------------------------------------------- | |
| gfx.print_rotatedHLDEBCA: | |
| ; Print bitmap rotated. |
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| ; BRESENHAM LINE DRAWING | |
| ; This assumes MODE 4 (SAM coupé) with screen in 0-24575. | |
| ;------------------------------------------- | |
| line.plotHLC: | |
| ; Plot a point at (L,H) with colour C (0-15 only) | |
| ex af,af' | |
| push bc | |
| push hl |