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Re: why sb emulation require virtual 86 mode

The bottom line is that you need some form of virtualization or code patching. Virtualization can be hardware-assisted as in Virtual 8086 mode, which emulates real mode, or as provided by VT-x and AMD-V which go far beyond that but require a much more recent CPU. The dedicated interception …

Re: Getting CGA Stable on Composite Monitor

Potential modifications: If your JVC monitor uses a TDA4510 as PAL decoder, you could convert it to NTSC by replacing the TDA4510 and its support circuitry with a TDA4570 NTSC decoder and its support circuitry. JVC is a Japanese brand (NTSC territory), so a sufficiently flexible PCB design would not …

Re: Getting CGA Stable on Composite Monitor

The ATI Graphics Solution in your picture is definitely not going to output a PAL signal via its composite port. It's either NTSC or black and white, both usually with 60Hz. However, you could write a TSR driver that intercepts video BIOS calls and sets the CRTC registers to values that result in …

Re: ATI Color Emulation Card

Anonymous Coward wrote on 2020-12-24, 01:52: Does anyone know where this card was found? Was it a system pull? Presumably on a junk pile. Pin headers don't bend themselves. There's also some visible corrosion.

Re: Early Covox uses:

FreddyV wrote on 2020-12-27, 19:11: Speech synthesis hardware was doing the calculation, here, it is a simple DAC, the CPU will need to do everything and it may be too slow. Unless it's diphone concatenation. Then it's primitive.

Re: Early Covox uses:

kolderman wrote on 2020-12-26, 19:25: Does that Tandy laptop have Tandy sound? If not, one nice use of a COVOX plug is in emulating Tandy sound using TEMU. I doubt that a 7.16MHz machine will be able to run TEMU. Doesn't it need a 386?

Re: Why is ADPCM so important?

In my opinion the biggest advantage of the various types of adaptive differential pulse code modulation techniques is their relatively low complexity overhead compared to normal linear PCM or companded PCM. Typical variants allow you to save 50% space with relatively small quality loss. The IMA …

Re: ATI Color Emulation Card

Good point! I missed that somehow. It just occurred to me that the switch settings might be similar to those of the ATI Graphics Solution. The following diagram is from its manual. (AGA is Commodore's OEM name for that card.) aga_switch_settings.png Assuming that the meaning of the individual …

Re: ATI Color Emulation Card

Interesting. So it does have the same gate array, just like I assumed. It is also not a pure color emulation card, because it clearly has a composite video header and there are too many traces running to the DE9 socket. There is no 16(.257)MHz oscillator, though, i.e. the MDA/Hercules pixel clock is …

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