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BlueMSX direct VDP registers access

by Metalion on 03-09-2007, 20:12
Score: 110.27 %, Type: Forum topic , Comments: 10 comments
that status register 0 is selected for reading so if you leave VDP #15 pointing to status register 2 then the bios will "crash" as you've describe yourself when debugging it. Because register 0 ... 0 3) you need to set to 0 S2 after having finished and before re-enabling the interrupts ...

Smooth horizontal scroll on MSX2 using r#23

by Metalion on 09-09-2007, 17:14
Score: 110.31 %, Type: Forum topic , Comments: 13 comments
a scanline interrupt (by setting r#19 and r#0) - or simply set the r#19 and check on r#0 until the scanline ... of interrupts. The interrupt handler is managed by a RST 038h, which in turns calls the 0FD9Ah hook in the system ... in r#0, and only check on r#0 until the scan interrupt flag (F) is set in s#0. Anyone can confirm this ? ...

Reading the control registers of the VDP

by Metalion on 10-09-2007, 08:02
Score: 110.44 %, Type: Forum topic , Comments: 6 comments
#F3DF - #F3E6: registers 0-7 #FFE7 - #FFF6: registers 8-23 #FFFA - #FFFC: registers 25-27 Thanks ...

Interrupts help needed

by Metalion on 12-09-2007, 09:12
Score: 110.46 %, Type: Forum topic , Comments: 8 comments
karoshi forum for this http://karoshi.msxgamesbox.com/index.php?topic=212.0 ) the interrupt code ... PopulateKeyMatrix ld a,(keys+8) ;space bit 0,a ;Check whether space is pressed ret z ...

MSX-Music BIOS info

by Metalion on 16-09-2007, 17:53
Score: 110.42 %, Type: Forum topic , Comments: 32 comments
Koustracker - Studio FM - Super Music Editor 3.0 Based solely on the efficiency of the driver/player, ...

RST $38 T-states

by Metalion on 08-10-2007, 08:56
Score: 110.41 %, Type: Forum topic , Comments: 10 comments
9100h ;tab vectors im 2 ;======================================== .phase 9000h-7 db 0feh ;flag binare ... test2: jr start ;---------------------------------------- ;&H9002 res_1: dw 0 ;result without RST 38 ;&H9004 res_2: dw 0 ;result with RST 38 ;---------------------------------------- ; set INT mode 2 start: ...

SCC Waveform table

by Metalion on 12-10-2007, 15:55
Score: 110.58 %, Type: Forum topic , Comments: 8 comments
psg simply setting the freq = 0 and the envelope to triangle wave form for a specific channel. ...

asMSX strange compiling log

by Metalion on 29-10-2007, 19:23
Score: 110.62 %, Type: Forum topic , Comments: 4 comments
Hi everyone, I am using asMSX 0.12g and each time I am compiling the source, I have a strange line in the log. See line with "Interrupt.asm" in the picture. Is it an error message or a bug ? (I tried to reach Eduardo Robsy but the e-mail given in the user's manual did not work) ...

Konami SCC Megarom header

by Metalion on 01-11-2007, 23:25
Score: 110.57 %, Type: Forum topic , Comments: 18 comments
Hi, What is the correct Konami SCC megarom header ? I am writing a game with asMSX 0 ... subpages so far (0 to 4) so the ROM file is 40Kb . The problem arises when I want to select subpage #4 ... registers are 0-1-2-3 for the 4 memory banks). [quote]I have defined 5 subpages so far (0 to 4) so ...

FDISK310 does not work

by Metalion on 20-11-2007, 09:16
Score: 110.58 %, Type: Forum topic , Comments: 13 comments
I have received my Sunrise CF interface and I tried to make the partitions on a 128Mb CF card, but it does not work. Here is the situation : - A 128 Mb CF card is inserted in the left slot - The Sunrise floppy disk is inserted in the FDD - The ...
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