VSpider – ZX Spectrum Pentagon Clone

Hardware Features

ULA implemented using Altera CPLD (EPM3256)
512 KB RAM
128 KB ROM
Built-in DivMMC
Z-Controller support
YM2149F TurboSound (true stereo output)
Kempston-compatible joystick interface
Bluetooth audio module for game loading
WiFi Ready

Video Outputs

RGB (Mini-DIN/9, Sega-style)
Composite
S-Video

Audio & I/O

EAR / MIC (tape interface)
Line audio output

Operating Modes

Mode Description
A – Pentagon 128 KB + DivMMC
B – Pentagon 512 KB + GLUK Service + Z-Controller + TR-DOS (virtual 384 KB disk)
C – Experimental ZX Spectrum +3 with MMC and +3e ROM

EPROM Layout

Bank Address Range Content
0 – 00000h – 03FFFh esxDOS 0.8.9
1 – 04000h – 07FFFh esxDOS 0.8.9
2 – 08000h – 0BFFFh BASIC 128
3 – 0C000h – 0FFFFh BASIC 48
4 – 10000h – 13FFFh GLUK or FATALL
5 – 14000h – 17FFFh TR-DOS
6 – 18000h – 1BFFFh BASIC 128
7 – 1C000h – 1FFFFh BASIC 48
– Jumper & Switch Configuration
– J11 — Video Mode Selection (CSYNC / Composite)
Pins Mode Usage
1–2 Composite Sync Use with Mini-DIN/9 → Composite cable
2–3 RGB Sync (CSYNC) Use with Mini-DIN/9 → SCART (Euro RGB) cable

Tip:

Wrong setting = unstable or no picture
SCART users should almost always use 2–3

SW3 — Firmware Mode Switch

Mode 1 2 3
A Enables / disables DivMMC TurboSound ON/OFF —
B — TurboSound ON/OFF —
C Switch between +3e / +3 ROM TurboSound ON/OFF —

Notes:

Switch 2 (middle) controls TurboSound enable/disable in all modes
“—” means the switch position is ignored
Other switches are reserved for future features

Demo Video

Designed for retro compatibility + modern convenience
Ideal for:
    Demo scene enthusiasts
    Hardware hobbyists
    ZX Spectrum collectors

Open Sourse project by konkotgit
https://github.com/konkotgit/VSpider