Hi,
Can I just get this cleared up : The MZ-700 doesn't have a second page of video RAM (like the 80A) does it? So you can't double buffer?
Thanks!
MZ-700 Graphics
Re: MZ-700 Graphics
No, MZ-80 A is the only MZ to allow a double buffer because of the video chips it has. While MZ-700 has two pages, the second page cannot be displayed : you need to swap or copy bytes between them which is very slow because both pages can only be accessed during the horizontal blanking (signal /WAIT is asserted negatively until HBLANK is 0 when trying to access VRAM).
Also that's one of the reasons MZ-700 is not technically retro-compatible to MZ-80 A and it said to be to MZ-80 K.
Also that's one of the reasons MZ-700 is not technically retro-compatible to MZ-80 A and it said to be to MZ-80 K.
Re: MZ-700 Graphics
Ok thanks. That's what I thought. It kind of makes the MZ-80A a bit more special!
Re: MZ-700 Graphics
It looks as if MZ-80A is the low-cost version of MZ-80B (professional target). For instance, the video chips and the expansion bus would be more in common with the MZ-80B than the MZ-80K. I see no successor to MZ-80A which was only for oversea (MZ-1200 for Japanese market). I remember I read an Japanese article discovering the MZ-80A and looking for adding color output. It was mentioned some similarities between MZ-80A and MZ-80B regarding hardware. Most hardware additions not specific to MZ-80K are not found in the MZ-700 and next generations.
Re: MZ-700 Graphics
I don't think the MZ-80A and the MZ-1200 are similar. The MZ-1200 seems more like a K but in an A chassis
Re: MZ-700 Graphics
Yes, probably the same way as between MZ-800 and MZ-1500 which the only common thing is the fact they are retro-compatible to MZ-700.
Re: MZ-700 Graphics
Details of differences between MZ-80A and MZ-1200: http://retropc.net/ohishi/museum/mz1200.htm.
In that article, you will find a lot of interesting detail about the hardware : a color screen was almost available for instance on MZ-80A.
In that article, you will find a lot of interesting detail about the hardware : a color screen was almost available for instance on MZ-80A.
Re: MZ-700 Graphics
Pretty interesting!
On a tangent : Does anyone know what the naming scheme actually means for things like SA-1510 and SP-1002 ? What is 'SA' and what is 'SP' ?
On a tangent : Does anyone know what the naming scheme actually means for things like SA-1510 and SP-1002 ? What is 'SA' and what is 'SP' ?