From 02f601759aea69c314101c8c9d072c4190d28abc Mon Sep 17 00:00:00 2001 From: UzixLS Date: Tue, 16 Mar 2021 22:09:29 +0300 Subject: [PATCH] update readme --- README.md | 25 ++++++++----------------- 1 file changed, 8 insertions(+), 17 deletions(-) diff --git a/README.md b/README.md index b2466e2..f0ff54b 100644 --- a/README.md +++ b/README.md @@ -1,24 +1,15 @@ ## ZX-TSid -Sound card for ZX Spectrum edge connector (ZX-BUS). Contains MOS SID, YM2149 (AY-3-8910) and covox. +MOS SID sound card for ZX Spectrum edge connector (ZX-BUS). -### Current status -Work in progress, both pcb and firmware isn't finished yet and may contain serious issues. -Please note the [errata](pcb/rev.A/ERRATA.txt) for rev.A pcb. - -### SID -MOS-6581 or MOS-8580 may be installed, but with some cautions. This addon doesn't contain buffers between SID and bus connector, and that may cause SID's damage by ESD if no luck. As I have no real SID, I've checked this addon only with SwinSID. +PCB is compatible with SID 6581 and 8580, but also contains integrated SwinSID emulator. SID accessible via #xxCF port, where xx - SID's register number. -### YM2149 (AY-3-8910) -Accessible by TurboSound standard as a second sound chip. ABC or ACB stereo panning selectable with onboard jumpers. - -### Covox -Monophonic covox accessible via #xxFB port (Pentagon standard). - -### Line input You may connect your ZX Spectrum audio output to second 3.5mm jack and it will be mixed in sound card output signal. -### Compatibility -SID and Covox (theoretically) should work with any ZX Spectrum containing edge connector (48K, 128K, +3, clones, etc.). -YM2149 uses IORQGE signal, which is incompletely implemented in original ZX Spectrums and most clones (such as Harlequin). Sizif-512 and Karabas-128 clones implements IORQGE in right way. +### Changelog & current status +* Rev.A - initial release with SID, AY and Covox. [Errata](pcb/rev.A/ERRATA.txt). +* Rev.B - abandoned. Files kept for historical reason. +* Rev.C - removed AY and Covox. Added SwinSID emulator. PCB is vertical oriented now. +* Rev.D - improved signal-noise ratio. Added compatibility with turbo CPU modes (7MHz, 14Mhz). +TODO: check with real SID chip.