In message <[EMAIL PROTECTED]> [EMAIL PROTECTED] writes: > On Fri, 20 Jan 1995 11:02:50 GMT, Brian Gaff Sam Dept. said: > > I have been thinking.. (dangerous) As SAM in a mass produced for > > is basically dead, I wonder what sort of PC would be needed to > > emulate it? > > I would say that if you used the software Z80 emulation of, say, Z80, > then a graphics board and a sound chip would be sufficient. The sound > chip would obviously be a Philips one identical to the Sam's. The graphics > board would have to have either DMA or on-board memory in order to store the > following information. > > * a memory image of the screen (between 6K and 24K) > * palette info, including mid-screen palette changes > * mode info, including mid-screen mode changes. > > If it didn't do this, then making a complete emulation would be a real pain > because the mode can change on any part of the screen at a moment's notice > and that would require a whole lot of processing to emulate in software. > However, perhaps a SuperEmulator(tm) such as Arnt's proposed QAOP might > be able to spare enough processing time to recreate the video whenever > necessary. > > The software emulation should be able to count cycles and generate line > interrupts at the correct times. Whenever the palette or mode changes, it > should be able to work out what position on the screen to make the change > from the cycle count. > > imc > > Agreed, would a SAM ASIC be of use? There are a lot of them around I believe! :-)
This list seems to be in pverdrive just now, has everyone had an extra Weetabix, or what? Brian -- Brian Gaff Sam Dept.
