New Z80B at 6 MHz

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By pitpan

Prophet (3152)

pitpan's picture

24-05-2004, 07:46

Hi!

I will receive in two weeks some Z84C0006PEC ICs. That is what we call a Z80B, a Z80 in 40 pin package (dual-in-line, DIP format). It is pin-by-pin compatible with the good old Z80A from the MSX/MSX2/MSX2+(some models) system.

With this CPU you will be able to push your MSX up to 6,14 MHz (maximum speed supported by this CPU). You will need to change the original Z80 for this one and then change the clock signal. Further details about the different process can be seen in http://www.hansotten.com

If you are interested, please contact me by e-mail at this address:
eduardo AT robsy DOT net

Regards,

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By msd

Paragon (1472)

msd's picture

24-05-2004, 09:01

Why did you not order the Z80H?

By pitpan

Prophet (3152)

pitpan's picture

24-05-2004, 09:40

Because Z80B had an excellent price. In addition, MSX1 computers cannot handle Z80H maximum speed clock. Z80B is bundled in Panasonic MSX2+ computers and its users would tell you wonders about it.

Perfect to make an improved upgrade from MSX2 to MSX2+.

By anonymous

incognito ergo sum (116)

anonymous's picture

24-05-2004, 10:44

Wonders like Z80B at 6 Mhz is 1.69 times as fast then a Z80A at 3.58 Mhz?

Wink

By msd

Paragon (1472)

msd's picture

24-05-2004, 11:11

It is easier to switch from 3.54 to 7.16Mhz. The panasonic doesn't have a z80B, it has a chip which has an build in z80 (same chip as used in the turbo r)

By [D-Tail]

Ascended (8259)

[D-Tail]'s picture

24-05-2004, 11:16

You mean a S1990, msd? That's what we call, the MSX-engine, right?

By msd

Paragon (1472)

msd's picture

24-05-2004, 11:21

no not the s1990, another chip. Don't know the number. Almost all speed up kids for the msx are 7.16Mhz, but it can be higher. 8Mhz shouldn't be a problem, but you need the right circuit to switch between them

By karloch

Prophet (2157)

karloch's picture

24-05-2004, 11:57

It is easier to switch from 3.54 to 7.16Mhz. The panasonic doesn't have a z80B, it has a chip which has an build in z80 (same chip as used in the turbo r)

Are you sure? Take a look to the description of the Panasonic models here. It says clearly that they have a Z80B.

By msd

Paragon (1472)

msd's picture

24-05-2004, 12:13

hmm... I will look it up again. I remember that some people boosted such a 2+ computer to even a higher freq. Something of 9Mhz, this can not be done with a z80b

By dhau

Paragon (1570)

dhau's picture

24-05-2004, 15:20

It's a standalone CPU, but I can't tell the model, because it is covered with a passive heatsink.

By flyguille

Prophet (3028)

flyguille's picture

24-05-2004, 15:44

in argentina the z80B cost u$s0.33 !!!!

that price is because is too much used in old telephone things.

One time a seller offerme a lot of 10 units, at that price and i refused that. I not want to eat z80B, i preffer z80H... up to 10mhz

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