Sound card NeoGS for ZXBUS (ZX Evolution)

Sound card NeoGS for ZXBUS (ZX Evolution)!

WARNING! NeoGS sold and supplied by Vitaliy tetroid.nedopc.com tetroid@inbox.ru.

Sound card NeoGS appropriate for playing trackers (MOD) and compressed (MP3) music on Spectrum-compatible computers with ZXBUS slot.

Design:
hardware: Vadim Akimov (LVD), Roman Chunin (CHRV), Vyacheslav Savenkov (Savelij), Alexej Ghabin (KOE), Vasilij Klimov (JTN);
software: Vyacheslav Savenkov (Savelij).

Features:

Compatible with General Sound (GS);
Flexible scheme, based on fpga (Altera EP1K30);
4Mbytes RAM, 512Kbytes flash-ROM;
Extended techniques of memory addressing: 2 memory windows in visible area, exclude ROM from visible area;
Z80 frequency modes (10, 12, 20 and 24 Mhz);
Support up to 8 sound channels (for MOD);
SPI mp3-decoder (like VS1011);
SD-card SPI interface;
DMA to NeoGS memory (transfer data from ZX to NeoGS by instructions LDI, LDIR and similar);
Parallel working (NeoGS play music indepedently from ZX).

Documentation:

Sources mirror (SVN) accessed from svn.nedopc.com.

Programming manual:

"NeoGS" programming manual here and header file with defines of NeoGS ports here.

"NeoGS" programming manual (DMA) here.

"General Sound" programming manual here.

Hardware manual:

"NeoGS" user manual (revision C-VS) here.

"NeoGS" solder manual (revision C-VS) here.

Principal scheme (revision C-VS) here.

Montage scheme (revision C-VS) here.

Hardware sources here [PCAD] (not used for commercial purposes).

CPLD programming manual:

NeoGS revision C and higher (manufactured by NedoPC) have CPLD chip EPM3064/EPM3128, whose need to programm by special programmer from Altera (ByteBlasterMV, USB Blaster or same).

CPLD bitstreams (revision Cx) here.

About programming CPLD (revision Cх) here.

CPLD sources (Quartus 7.x): here.

Software:

Neo Player Light mp3 and mod player for NeoGS here.

Neo8Tracker mod tracker/editor for NeoGS here.

Z-PLAYER mod player for NeoGS here.

General Sound games and utilities on VTRDOS site here.

ROM files:

Actual ROMs from SVN svn.nedopc.com

Full ROM: full_ngs.rom.

Update ROM (for update by NeoGS updater): ngs_rom.upd.

NeoGS updater: hobeta, scl floppy image, tape image

Historty of ROM version:

Date	Version	File	Description
07.02.2026	1.11	here	Fix detecting of quantity memory pages, detect 512Kb, 2048Kb, 4096Kb memory sizes.
08.08.2014	1.10	here	Commands 9xx correction.
15.06.2013	1.09	here	Accelerate module convertation. Set 20MHz frequency instead of standard 12 MHz, set on boot.

History:

Revision C-VS:

NeoGS, revision C analog, but can use mp3 chips VS10xx series (VLSI solutions).
Added micro SD connector.
Fixed the audio connector.

Revision C:

Decrease board height (to 61mm).
Increase RAM to 4Mb.
Add RESET jumper (provide reset from ZX mainboard if shorted).
Change some electric parts (fpga firmware is compatible with previous version).

Revision B:
Thanks for project sponsors: GoodBoy, Valeron, Mick!

Fixed some errors.
Add 3.5' audio jack.
Remove "warm start" button.

Revision A:

First version, samples.

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Email: nedopc@mail.ru, nedopc@yandex.ru.