NEW MSX by TECNOBYTES

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Por Retrofan

Paragon (1282)

Imagen del Retrofan

25-01-2014, 19:11

Another project with V9958-V9990 and OPL4: ColecoVision CV2.
I suggested to use the OPL4 for audio in the past and they consider using it :)
Maybe we can benefit from both projects for having new software in the near future :)
It uses a Z80 at 14 MHz...

Por anonymous

incognito ergo sum (116)

Imagen del anonymous

26-01-2014, 12:25

msd wrote:

The v9990 even contains z80 example code. Hardest thing is getting a new msx turbo r compatible I guess .

Wikipedia says that both the Z280 and R800 are descendants of the never released Zilog Z800 CPU.

And by checking the Z280 data sheet, it indeed has the same multiplication instructions using exactly the same opcodes as the R800. The Z280 seems capable to run R800 code without trouble.

In other words, this can mean that all you need to create a Turbo-R compatible MSX is the Z280 CPU.

Por msd

Paragon (1472)

Imagen del msd

25-01-2014, 22:18

@retrofan: O no they will use all our precious chips for another system Tongue.

Por syn

Prophet (2097)

Imagen del syn

25-01-2014, 22:23

msd wrote:

@retrofan: O no they will use all our precious chips for another system Tongue.

That was actually what I was thinking as well Wink but hey if this would stimulate v9990 activity or maybe v9958 (games that would probably run on both systems with some patching perhaps?) then I would say it was well worth the sacrifice Wink

Por Piter Punk

Master (227)

Imagen del Piter Punk

26-01-2014, 01:54

Take a look on ColecoVision CV2 page, one of the "key people" is Ricardo Oazem, from Tecnobytes. Probably the lessons learned in each project are helping the other to get better Smile

Por msd

Paragon (1472)

Imagen del msd

26-01-2014, 09:45

Quote:

And by checking the Z280 data sheet, it indeed has the same multiplication instructions using exactly the same opcodes as the R800. The Z280 seems capable to run R800 code without trouble.

That is nice , but also this cpu is end of life..

Por wingedporcupine

Supporter (2)

Imagen del wingedporcupine

26-01-2014, 11:14

msd wrote:

That is nice , but also this cpu is end of life..

Certainly! But which other MSX chip isn't? Smile

Por msd

Paragon (1472)

Imagen del msd

26-01-2014, 12:24

the z80 isn't , but the z280 never really took off. even canceled iirc.. the z380 might be easier to find, but also that one you can't order at zilog. The z80 you can still order.

Por Leo

Paragon (1236)

Imagen del Leo

26-01-2014, 15:34

for those interested in have tons of z180 33MHz and Z280 12MHz parts ...
found on UTSOURCE several years ago , Z180 can replace Z80 with pin adapter but Z280 needs more circuitry since address and data are muxed with a control line.

Por msxegor

Master (183)

Imagen del msxegor

27-01-2014, 13:37

Z280 just needs one latch and pin-adapter to be a drop-in replacement for Z80. Alas, this disables cache in Z280, and on S3527-based machines it will work only at halved clock (as well as older versions of z180 which did not have 1x clock option). Nice CPU, maybe the best 8-bitter - cache, memory AND io ports virtualization, burst DRAM access.

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