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Another strange VDP behavior?

by PingPong on 30-07-2022, 11:57
Score: 181.05 %, Type: Forum topic , Comments: 2 comments
Hi, all. Time ago, someone mentioned a issue about different vdp timings when performing a vram read. Basically: A) on TMS one can set up the vram ptr and then do a in on data port, reading the value without any delay B) it seems that V99x8 ...

Help: Screen 4 Wrong SAT Address?

by PingPong on 03-01-2022, 21:14
Score: 174.42 %, Type: Forum topic , Comments: 5 comments
Hi, all. when the VDP is set in screen 4 the r5 is set to 63 (dec) while the r11 to 0. If ... however the address is not correct: putting a sprite on plane 0 at 10,20 should show byte value 20 @ 8064 ... to 63 (dec) while the r11 to 0. If i've done the math correctly this should mean ...

nightshade

by PingPong on 01-07-2021, 23:43
Score: 169.55 %, Type: Forum topic , Comments: 3 comments
it is feasible to have a msx2 port of this game like batman ? https://www.youtube.com/watch?v=_WgmUoiJvgA After all the great work on After all the great work on the Alien 8 and Knighlore remakes it should be possible for the Filmation ...

watch this

by PingPong on 22-04-2021, 00:03
Score: 167.49 %, Type: Forum topic , Comments: 11 comments
https://www.youtube.com/watch?v=DHH6y9le7BU Nice stuff. I really want to Nice stuff. I really want to see someone use this method on MSX2 in combination with the scroll & adjust register to get smooth parallax scroll . Very ...

VDP Sat Rotation & blitter

by PingPong on 05-04-2021, 19:31
Score: 167.2 %, Type: Forum topic , Comments: 8 comments
Y=sprite vram color area/128 (A) COPY (0,Y)-(255,Y) to (0, Y+5) -> first 8 sprite color (B) COPY (0, Y+1) - (255, Y+3) to (0,Y) (C) COPY (0, Y+5) -(255, Y+5) to (0, Y+3) the last copy could ... of rotating, you just have two versions of the SAT. One where sprites are in forward order: 0, 1, 2, 3, 4, ... ...

V9990 write mask

by PingPong on 25-12-2019, 11:15
Score: 156.76 %, Type: Forum topic , Comments: 68 comments
0x40000) ? (color >> 8) : (color & 0xFF); byte dstColor = vram.readVRAMDirect(addr); byte newColor = logOp(lut, srcColor, dstColor); byte mask1 = (addr & 0x40000) ? (mask >> 8) : (mask & 0xFF); byte mask2 = mask1 & (0xF0 >> (4 * (x & 1))); ...

openMSX toolset

by PingPong on 06-10-2019, 20:43
Score: 155.17 %, Type: Forum topic , Comments: 3 comments
Hi, all. i wondering how much complex is to create this kind of tools using TCL in openMSX. I do not know a single bit of TCL nor i ignore how much deeper is the integration in openMSX. There are my wishes, aimed most at hacking and or convertion from ...

Fusion_C and HTIMI

by PingPong on 28-09-2019, 15:23
Score: 157.48 %, Type: Forum topic , Comments: 43 comments
#include "fusion-c/header/msx_fusion.h" // io ports for vdp __sfr __at (0x98) VDP_port1; __sfr __at (0x99) VDP_port2; volatile char vdp_status; volatile int sync_flag; volatile int cpt; void interrupt_routine () __critical __interrupt(0) __preserves_regs(a,b,c,d,e,h,l,iyl,iyh) { // read the vdp status. ...

openMSX "software" breakpoint

by PingPong on 27-09-2019, 22:48
Score: 154.98 %, Type: Forum topic , Comments: 14 comments
set_watchpoint read_io 0x2E The debug device can be used to log debug information. akumajo: can you ... set_condition {[peek [reg pc]] == 0x40} There. It’s slow though. I don’t understand why this would ...

Fastest way to test

by PingPong on 26-08-2019, 20:11
Score: 154.6 %, Type: Forum topic , Comments: 6 comments
Hi, what is the fastest way to test if after a logical bitwise operator the accumulator contains 255? Like this Ld a, 127 Or 128 Instead of cp 255 then jp or Jr what I could do? inc a and jr z,... inc a and jr z,... ...
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