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ZX Spectrum +3 - MAME machine

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specpls3
ZX Spectrum +3
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GAME SYSTEM CHD BIOS DEVICE PARENT CLONE MECHANICAL SCREENLESS

Main data
Romset and name:
specpls3 ZX Spectrum +3
Short name:
ZX Spectrum +3
Manufacturer:
Amstrad plc
Year:
1987
Genre:
Computer
Category:
Computer / Home System
Serie:
-
Driver source:
sinclair/specpls3.cpp
Language:
-
Similar games:
Input / Controls
Players:
Up to 2 players
Input:
Joystick 8 ways, Keyboard
Buttons / keys:
57
Coins:
0
Cabinet:
-
Free-play:
Not supported

Rankings
Average user rating:
AntoPISA BestGame:
-
MASH All-Time:
-
Video
Display:
352x296@50.021154 Hz, CRT 25kHz
Orientation:
Horizontal
Scrolling:
Unknown
Colors:
-
CPU:
Zilog Z80
Audio
Sound:
2 audio channel
Audio chips:
AY-3-8912A PSG, Cassette, Filtered DAC, Floppy sound, Speaker
Romset
First release:
Mess 0.36b16 released on feb-07 2000
Last release:
Mame 0.271 released on oct-31 2024
Clone of:
specpl2a ZX Spectrum +2a
Bios:
Not required
Use rom of:
-
Use sample of:
-
Previous romset:
None
New romset:
None
Files
Dump:
GOOD
Required files:
Romset:
Status
OVERALL:
GOOD
Emulation:
Good
Graphic:
Good
Color:
Good
Sound:
Good
Cocktail:
Good
Protection:
Good
Save state:
Not supported
Additional infos
  • History
  • Info
  • Score
  • PCB
  • Commands
  • Init
  • Driver
  • XML
  • Computer published 37 years ago:

    ZX Spectrum +3 © 1987 Amstrad PLC.

    TECHNICAL
    The ZX Spectrum +3 looked similar to the +2 but featured a built-in 3-inch floppy disk drive (like the Amstrad CPC 6128) instead of the tape drive, and was in a black case.

    The +3 saw the addition of two more 16 KB ROMs. One was home to the second part of the reorganised 128 ROM and the other hosted the +3's disk operating system. This was a modified version of Amstrad's PCWDOS (the disk access code used in LocoScript), called +3DOS. These two new 16 KB ROMs and the original two 16 KB ROMs were now physically implemented together as two 32 KB chips. To be able to run CP/M, which requires RAM at the bottom of the address space, the bank-switching was further improved, allowing the ROM to be paged out for another 16 KB of RAM.

    The ZX Spectrum +3 power supply provides the same voltages as the one supplied with +2A. This power supply has the same DIN connector so can also be used with the +2A. However, the power supply purchased with the +3 had 'Sinclair +3' written on the case.

    TRIVIA
    The ZX Spectrum +3 was launched in 1987 and was the only Spectrum capable of running the CP/M operating system without additional hardware.

    Some older 48K and a few older 128K games were incompatible with the machine. Such core changes brought incompatibilities:
    • Removal of several lines on the expansion bus edge connector (video, power, and IORQGE); caused many external devices problems; some such as the VTX5000 modem could be used via the 'FixIt' device.
    • Dividing ROMCS into 2 lines, to disable both ROMs.
    • Reading a non-existent I/O port no longer returned the last attribute; caused some games such as Arkanoid to be unplayable.
    Memory timing changes; some of the RAM banks were now contended causing high-speed colour-changing effects to fail.
    • The keypad scanning routines from the ROM were removed.
    • Move 1 byte address in ROM.

    Production of the +3 ceased in December 1990, believed to be in response for Amstrad relaunching their CPC range. At the time, it was estimated about 15% of ZX Spectrums sold had been +3 models.

    CONTRIBUTE
    Edit this entry: https://www.arcade-history.com/?&page=detail&id=83043&o=2
    Informations provided by © Alexis Bousiges
    Informations provided by Contribute to the translation
  • Informations provided by
    Informations provided by / © Copyright of Fujix
  • Informations provided by
  • Informations provided by
  • Informations provided by Fabricio Coroquer, revisited from the work of
    NOTICE: The short version was discontinued in November 2019
  • Informations provided by Contribute
  • Informations provided by
  • Informations provided by
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If you notice any inaccuracy or error, please report

Data updated on november 1 2024


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Romset:
specpls3
Title:
ZX Spectrum +3
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