Wiki editing discussion

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بواسطة gdx

Enlighted (6213)

صورة gdx

02-04-2023, 11:04

AX-660 and AX-990 don't have S1985. It uses specific chips with a PSG (File KC89C72) and a Z80 both external.

It's amazing to see an MSX1 with a V9958. It looks even like there's 64kB of VRAM in both.

بواسطة gdx

Enlighted (6213)

صورة gdx

02-04-2023, 16:31

The AX-330 uses four 64 x 4bit RAM (TMS4464-15). So I think we can consider this to be the case for the other two as well. All three have 64 kB of VRAM. Sakhr may have had these cheaper memories. The AX-660 and AX-990 should be easy to upgrade to MSX2, even see MSX2+, except maybe for the battery and the RTC.

بواسطة mars2000you

Enlighted (6481)

صورة mars2000you

02-04-2023, 16:34

gdx wrote:

Popolon_ says it works or does he just say it's a VHDpc compatible player?
The flyer seems to say that it is indeed a VHDpc player but that is not supported by the IF-7900 interface.

Both texts are complementary I think and we can conclude that HD-7800 does not have the VHDpc logo.

Manual:
"このたびは、ビクター VHD インターフェース ・ IF-7900 をお買上げいただき、ありがとうございました。
このIF-7900は、ビクターMSX パソコン (スーパーインポーズ機能付) とビクター VHDビデオディスクプレーヤーおよび VHD言語入りビデオディスク(ともに VHDpc マーク付) と組み合わせて、VHD言語によるインターラクティブ (対話操また、内蔵の拡張BASICにより、VHDプレーヤーをMSX パソコンでコントロールすることができます。 この場合はVHD言語によるインターラクティブ機能はできませんが、 MSX パソコンのスーパーインポーズ機能を利用すればプログラミング次第で同様の機能を楽しむことも可能です。 この時、 VHDプレーヤーは13ピン外部制御端子付 (HD-7800、 HD 7900、BD-7950) であれば使用可能です。

Thank you for purchasing the JVC VHD Interface IF-7900.
This IF-7900 can be combined with JVC MSX personal computer (with superimpose function), JVC VHD video disk player and his VHD language video disk (both with VHDpc mark) to enable interactive operation in VHD language.
In addition, the built-in extended BASIC allows the VHD player to be controlled by an MSX computer. In this case, the interactive function by VHD language is not possible, but if you use the superimpose function of MSX PC, you can enjoy the same function depending on the programming. At this time, VHD players with 13-pin external control terminals (HD-7800, HD 7900, BD-7950) can be used."

Flyer:
"●HD-7900にはVHDpcのマークがついています。VHDおよびVHDpc マークのついたすべてのビデオディスクがご使用になれます。 ビデオディスクプレーヤーHD-7900には、パソコンHC-7またはHC-6を使用してください。●ビデオディスクプレーヤー HD-7100(B)、 HD-7500(B)、 HD-7800ではVHDpcマークのついたビデオディスクはご使用になれませんのでご注意ください。

●The HD-7900 has a VHDpc mark. All video discs with VHD and VHDpc marks can be used. Use a PC HC-7 or HC-6 for the Video Disc Player HD-7900. ●Please note that video discs with the VHDpc mark cannot be used with the video disc player HD-7100(B), HD-7500(B), and HD-7800."

بواسطة mars2000you

Enlighted (6481)

صورة mars2000you

02-04-2023, 16:33

gdx wrote:

The AX-330 uses four 64 x 4bit RAM (TMS4464-15). So I think we can consider this to be the case for the other two as well. All three have 64 kB of VRAM. Sakhr may have had these cheaper memories. The AX-660 and AX-990 should be easy to upgrade to MSX2, even see MSX2+, except maybe for the battery and the RTC.

So it means that the extra RAM, not usable on MSX1, is there for the NES or Sega part.

بواسطة Accumulator

Champion (333)

صورة Accumulator

02-04-2023, 18:07

The boot logo mentons:
MSX System
Version 1.01
Copyright 1986 by
Microsoft & Alalamiah
.

بواسطة Accumulator

Champion (333)

صورة Accumulator

02-04-2023, 18:12

The minimum of vram for V9958/V9938 is 64Kb. Seems logic..

بواسطة sdsnatcher73

Prophet (3953)

صورة sdsnatcher73

02-04-2023, 18:34

Accumulator wrote:

The minimum of vram for V9958/V9938 is 64Kb. Seems logic..

That is not true, the minimum VRAM for MSX2 is 64kB but there are MSX1 machines with V9938 with only 16kB VRAM (as an MSX1 will only need 16kB VRAM). 16kB VRAM again is the minimum for MSX1 (and the maximum for TMS9918 series) but the TMS9918 VDP (and as such also the Yamaha V9938/58) can be configured with less than 16kB. Less modes will be usable of course.

From the TMS9900 datasheet: The dynamic RAM interface consists of direct wiring of eight 4Kx1, 8Kx1 or 16Kx1 dynamic RAS/CAS-type RAMs to the VDP. The amount of RAM required is dependent upon the features selected for use in the application.

بواسطة Accumulator

Champion (333)

صورة Accumulator

02-04-2023, 18:40

You are CORRECT! VR select also has 16kb x 1bit / 16kb x 4bit

بواسطة Accumulator

Champion (333)

صورة Accumulator

07-04-2023, 17:50

Please combine the MSX-Engine and Yamaha_S-1985 / YM3814 and S-3527... and inlcude them.. additionally some have versions A/B/C
Difficult to search the wiki btw..

بواسطة Accumulator

Champion (333)

صورة Accumulator

07-04-2023, 17:52

What is the AT 990 chip exactly? could not find any documentation (AX-660 & AX-990)

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