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Improving MSX-DOS2 ISR

by DarkSchneider on 02-10-2019, 13:04
Score: 157.81 %, Type: Forum topic , Comments: 0 comments
I was thinking about that on computers plenty of RAM the ISR and its BIOS accesses could be improved. The "driver" process would be like: - Reserve a segment as system. - Clone BIOS into that segment. - Modify MSX-DOS2 38H called ...

OTIR strange behavior, does not allow to modify HL

by DarkSchneider on 16-09-2019, 12:20
Score: 157.54 %, Type: Forum topic , Comments: 1 comment
Well, I want to make a copy in a row from different sources, if I do this: set HL, DE, C values ld b, SIZE otir add hl, de <- THIS ONE IS IGNORED, EVEN IF I DO LD HL, 0 ld b, SIZE otir But if I do: set HL, DE, C values ld b, SIZE - 1 <- NOTICE DIFFERENCE otir outi add hl, de ...

VDP access preventing interrupt triggering?

by DarkSchneider on 16-09-2019, 09:07
Score: 157.65 %, Type: Forum topic , Comments: 4 comments
interrupt request from VDP will canceled when the register status 0 or 1 will be read. DarkSchneider ... DIs), it only stops when VDP status register 0 is read (for vblank int) or status register 1 (for hblank ...

Why MSX-Music uses YM2413 instead YM3526?

by DarkSchneider on 08-09-2019, 09:29
Score: 157.42 %, Type: Forum topic , Comments: 1 comment
I wonder why YM2413 was used as FM-chip for MSX instead YM3526. Thinking about it, I found this article: https://www.faq.msxnet.org/fmpac.html That thinks like me, why to launch another FM chip and create incompatibility, dividing developers ...
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