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Scroll 1px problem, need your help

by Metalion on 26-12-2022, 21:14
Score: 182.95 %, Type: Forum topic , Comments: 8 comments
on the scroll direction. When going right, a new map is needed between +0 and +7. When going left, it's between +7 and +0. So I bluntly tested loading a new map at each step, but the problem is still there: ... on the scroll direction. When going right, a new map is needed between +0 and +7. When going left, it's ...

Switching RAM in page 2 from a ROM

by Metalion on 03-12-2022, 08:38
Score: 181.77 %, Type: Forum topic , Comments: 15 comments
on page 0, you can use the ENASLT routine (0024h). In pseudo code, it would look like this: A = ... Expanded slot (0 = no, 1 = yes) To my knowledge, there is no BIOS routine to directly retrieve the ID ... ; Mask only needed for page 0 sub = (SLTTBL + 2) ; Should be 0 is slot not extended slotId = prim | ...

Back to MSX1 palette on MSX2

by Metalion on 22-11-2022, 11:32
Score: 181.61 %, Type: Forum topic , Comments: 8 comments
routine: ; Routine to initialize colors palette under MSX-DOS EXBRSA equ 0FAF8h ; Sub-ROM slot number ... call CalSUBslt: db 0 ; Slot number CalSUBadrs: dw 0 ; Address ret By direct access to VDP: VDP_DW equ 00007h RG16SAV equ 0FFEFh ; Routine to initialize colors palette (MSX2~) ; ; Modify: AF, BC, ...

SPAT update on V9990

by Metalion on 16-10-2022, 14:41
Score: 180.35 %, Type: Forum topic , Comments: 28 comments
this one from Mega. https://mega.nz/file/uxkm1IYS#QhrHoofh-trtUP1CQ0AAC8JIi-Lk-i... Not sure how ... ... Unless you are speaking of the 8 possible offsets for the sprite pattern table (all in VRAM 0 ... offset: 0, 16, 32 and 48. I am more precise. I have the I am more precise. I have the first 64 ...

V9990 command with NX> image size

by Metalion on 25-09-2022, 21:15
Score: 179.33 %, Type: Forum topic , Comments: 5 comments
Hi, I'm making a LMMM command with SX>0 and NX>256 . What pixels ... is specified and rolling to "0" occurs when the specified range exceeds the image size What do they mean by " rolling to zero " ? rolling to 0 means reset to 0 rolling to 0 means ...

OpenMSX debugger problem

by Metalion on 17-09-2022, 18:46
Score: 179.04 %, Type: Forum topic , Comments: 3 comments
Hi everyone, Please tell me what I'm doing wrong, because OpenMSX debugger works almost never works when I want to put a breakpoint: 1) I launch OpenMSX catapult 2) I launch OpenMSX debugger 3) I start a rom 4) I connect the debugger to ...

V9990 registers at command termination

by Metalion on 11-09-2022, 08:35
Score: 178.75 %, Type: Forum topic , Comments: 11 comments
---------------------------------------------------------------------------- | HMMC | --- | --- | --- | . | --- | # | --- | 0 | --- | --- | ---------------------------------------------------------------------------- | YMMM | --- | . | --- | . | --- | # | --- | 0 | --- | --- | ---------------------------------------------------------------------------- | HMMM | --- | . | --- | . | --- | # | --- | 0 | --- | --- | ...

Disassembling Juno First

by Metalion on 28-07-2022, 18:52
Score: 177.21 %, Type: Forum topic , Comments: 14 comments
a RET at 430Ch. T430Dh 3EF0.... >ð.. LD A,0F0h T430Fh D3AA.... Óª.. OUT (0AAh),A ; PortC (8255) Keyb Row ; Erases RAM from 0E000h to E800h T4311h F3...... ó... DI T4312h 2100E0.. !.à. LD HL,0E000h T4315h 1101E0.. ..à. LD DE,0E001h T4318h 01FF07.. .ÿ.. LD BC,007FFh T431Bh 3600.... 6... LD ...

Switching RAM in page 0 on MSX2

by Metalion on 17-06-2022, 20:57
Score: 176.09 %, Type: Forum topic , Comments: 27 comments
snippet of code to do it ! I want to switch RAM in page 0 on an MSX2 (from a megarom with an ASCII ... Everything happens in INSTALL_RAM_ISR macro with setting page 0 to the same slot as page 3 (the slot ... in INSTALL_RAM_ISR macro with setting page 0 to the same slot as page 3 (the slot with the most RAM found ...

Can we use the 'i' register ?

by Metalion on 02-06-2022, 09:37
Score: 175.38 %, Type: Forum topic , Comments: 12 comments
Hi everyone, I am curious: when the Z80 is in interruption modes 0 or 1, the 'i' ... OS got an IM2 interrupt server in page 3, so one can flip the slot in page 0 freely. And then the i ... an IM2 interrupt server in page 3, so one can flip the slot in page 0 freely. And then the i register ...
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