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[WTB] TMTLogic GFX-Nine / Tecnobytes PowerGraph Light

by Metalion on 05-01-2020, 16:21
Score: 152.62 %, Type: Forum topic , Comments: 1 comment
Hello, As the title says, I'm searching for a V9990 extension. Either a TMTLogic GFX-Nine or a Tecnobytes Powergraph Light . Thanks. Technobytes are running a Technobytes are running a pre-order on a new batch, in case ...

[WTS] Vampire Killer

by Metalion on 01-03-2020, 09:51
Score: 153.67 %, Type: Forum topic , Comments: 2 comments
Hello, Located in Belgium, price without shipping : . Vampire Killer (EU version), cartridge only (very good) and manual (worn) : 70 euros . Vampire Killer (JP version), cartridge only (excellent) : 90 euros PM me at metalion (at) orange ...

ASCII 8 mapper does not work

by Metalion on 05-01-2020, 18:15
Score: 152.76 %, Type: Forum topic , Comments: 9 comments
at the beginning to facilitate the automatic recognition : ld a,0 ld (6000h),a ld a,1 ld (6800h),a ld a,2 ... call 138h [2] rrca and 03h ld c,a ld hl,0FCC1h add a,l ld l,a ld a,(hl) and 80h or c ld c,a [4] inc l ld a,(hl) and 0Ch or c ld h,80h jp 24h What I do not understand, is that it works ...

Disabling sprites during VBLANK

by Metalion on 08-06-2020, 19:03
Score: 155.59 %, Type: Forum topic , Comments: 2 comments
Hi everyone, If I want to maximize the bytes that I can transfer at VBLANK, do I have to disable sprites manually ? Or is it already part of the VDP's behavior during VBLANK ? In other words, if I take the (very useful) speed table of ...

Do you always use di/ei for VDP access ?

by Metalion on 06-01-2020, 13:41
Score: 152.77 %, Type: Forum topic , Comments: 9 comments
Hi everyone, Do you use di/ei for every case of VDP access ? It seems to me it can be avoided when it's a port where ISR will not access. For example, loading the palette colors on the V9938: ld hl,palette ld bc,16*2:9Ah xor a ...

Enemy sprite rendering routine call

by Metalion on 30-12-2020, 11:41
Score: 160.26 %, Type: Forum topic , Comments: 5 comments
be to try My advice would be to try both and see which one works better. Set a flag variable: 0 to Set a flag variable: 0 to render 1 to update sprites Set a frame variable Sprites update in the ISR: If flag=1 do other ISR hooked tasks then ret If flag=0 execute the whole ISR hooked tasks, set ...

Fast 16-bit signed comparison

by Metalion on 05-12-2020, 19:20
Score: 159.69 %, Type: Forum topic , Comments: 23 comments
and 'hl' and I want to be able to output according to that matrix : hl<=0 hl>0 de<=0 0 hl de>0 de max(hl,de) I've coded this, but it's messy ('hl' contains the output): ld a,h ; 5 cp d ; 5 jp z,.same ; 11 | same sign jp c,.hl_max ; 11 | de < 0 and hl >= 0 ...

First steps with MSX-Music

by Metalion on 09-08-2020, 18:59
Score: 159.2 %, Type: Forum topic , Comments: 29 comments
(0,0,1,1,1,1,1,1,1,1,1) 20 AD=&h7FF4:DAT=&h7FF5 30 POKEAD,&h30:POKEDAT,&h2F:' Instrument 2, volume 15 ... POKEAD,&h20:POKEDAT,&b00001000:' Octave = 4, F-number MSB = 0 60 POKEAD,&h20:POKEDAT,&b00011000:' +Key on This ... silent) while 0 means no attenuation (max volume). p.s. There is no need to set key-on separately from ...

FM rythm mode question

by Metalion on 26-09-2020, 20:55
Score: 158.04 %, Type: Forum topic , Comments: 2 comments
confusing register addresses 16H-18H (hexadecimal, 0-base) for channels 7-9 with slots 13-18 (decimal, ...

Konami/ASCII mapper page switch latency

by Metalion on 29-11-2020, 12:23
Score: 159.58 %, Type: Forum topic , Comments: 4 comments
Hello, Is there any hardware latency that needs to be taken into account when switching page within a Konami/ASCII mapper ? There is no latency. The bank There is no latency. The bank registers directly latch the value that is provided on ...
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