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How to use MSX-DOS2 memory mapper routines?

by DarkSchneider on 24-12-2016, 17:19
Score: 144.05 %, Type: Forum topic , Comments: 14 comments
address: set A = 0, D = 4, E = 2. With this I suppose the memory mapper device for extended BIOS has ... all_seg = mapper_routines + 0h. Looking at table definition: +0H ALL_SEG Allocate a 16k segment. For user segment: set A = 0, B = 0. On primary mapper, the easy way ;) CALL (all_seg) Check result ...

Safe set BIOS and restore RAM on page 0 from MSX-DOS?

by DarkSchneider on 11-10-2016, 09:13
Score: 156.42 %, Type: Forum topic , Comments: 37 comments
Is this safe? ; set BIOS LD H, 0 ; page 0 ; ROMSLT = Main BIOS slot ID. (MSX2 and up only) ... code using the BIOS directly ... ; code end ; restore RAM LD H, 0 ; page 0 ; RAMAD0 = Slot address of RAM in page 0 (DOS) LD A, RAMAD0 CALL ENASLT ; we are in BIOS environment so direct call ENASLT ...

Some VDP command for linear transfer?

by DarkSchneider on 29-07-2016, 12:01
Score: 142.45 %, Type: Forum topic , Comments: 18 comments
I wonder why the MSX-Video lacks the most elemental type to transfer data. From source to destination and size bytes. In other words a simple memcpy and its reverse. You can copy rectangles, which include linear copies and the VDP handling the change ...

V9938 manual wrong sprite documentation?

by DarkSchneider on 13-07-2016, 09:35
Score: 142.3 %, Type: Forum topic , Comments: 2 comments
Hi, I wanted to put the VSAT on 0x4200 VRAM address for SC4. Looking at V9938 manual, this should be done by setting R#5 = 0x84 and R#11 = 0. Looking at bitmap modes, we can see (and tested) ... wrong until I set the last 3 bits of R#5 to 1 (R#5 = 0x87) even in SC4. But with R#5 = 0 ...

Scroll register strange behavior

by DarkSchneider on 26-05-2016, 11:06
Score: 141.83 %, Type: Forum topic , Comments: 4 comments
I am mixing scroll register with line interrupt usage. Well, I noticed that setting R#23 (scroll Y register) to values greater than the line interrupt causes strange behavior, even causing all scroll registers (even R#18) stop working. The steps: ...

Need help with H.KEYI interrupt

by DarkSchneider on 20-05-2016, 09:46
Score: 141.67 %, Type: Forum topic , Comments: 14 comments
is the ISR code: .z80 KEYI equ 0FD9AH TIMI equ 0FD9FH CALSLT equ 0001CH RAMAD0 equ 0F341H WRTVDP equ 00047H ;LDIRVM equ 0005CH EXTROM equ 0015FH VDPSTA equ 00131H EXPTBL equ 0FCC1H RG0SAV equ 0F3DFH RG19SA equ 0FFF2H LINEINT equ 16 public isrset@ isrset@: di ;KEYI ld hl, KEYI ld de, oldkei ld bc, 5 ...

LDDR wrong in Z80 manual?

by DarkSchneider on 17-05-2016, 11:56
Score: 141.7 %, Type: Forum topic , Comments: 4 comments
It is supposed to do: copy, dec HL/DE, dec BC and check if 0. But what I have is not that, ... a[100], b[100]; for(i=0; i<100; i++) a[i] = i; /*memcpy(b, a, sizeof(int)*100);*/ printf("%a: %d %d %d\nb: %d %d %d\n", a[0], a[50], a[99], b[0], b[50], b[99]); rvmcpy((&a[99])+1, ...

Inter-slot calls to BIOS?

by DarkSchneider on 05-05-2016, 19:17
Score: 142.2 %, Type: Forum topic , Comments: 8 comments
i.e. to inter-slot call to BEEP (no parameters): Quote: BEEP (00C0H) *3 Function: ... is quite clear... CALSLT EQU #1C CALLF EQU #30 BEEP EQU #C0 NRDVRM EQU #174 PUSH HL LD A,(#FCC1) ; This is the "most standard" way LD IYH,A LD IX,NRDVRM LD HL,0 CALL CALSLT POP HL LD ...

Question about interrupts

by DarkSchneider on 05-05-2016, 11:07
Score: 141.56 %, Type: Forum topic , Comments: 26 comments
interrupts, you might want to take a look. Good video, it clarifies some things like the S#1 and S#0 ... interrupt and then do the IN 0x99. then flip back to 0 because so the IN 0x99 of bios goes like expected. ... in page 3 0xc000 and no ado with slotflips. needs a 257 bytes table with all the same bytes, needed ...

17-bit value for VRAM address?

by DarkSchneider on 10-03-2016, 11:40
Score: 140.88 %, Type: Forum topic , Comments: 3 comments
for this to set a BaseAdress. xxxxx000 = #0 xxxxx001 = #4000 xxxxx010 = #8000 xxxxx011 = #C000 ...
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