Admin Favorite: Famicom
🔑 Login
📝 Register
MENU
HOME
DATABASE
COMPANIES
TYPES
DOWNLOAD
BIRTHDAY
BOOKS
CONTACT
ℹ️ Info
💾 ROM
✏️ Edit
📤 Upload
Edit the information for
ZX Spectrum +3
NAME
E-MAIL
Actual Entry (non editable)
ZX Spectrum +3 (c) 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: 1. 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. 2. Dividing ROMCS into 2 lines, to disable both ROMs. 3. 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. 4. The keypad scanning routines from the ROM were removed. 5. 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. - SOURCES - Machine's bios. Machine's picture.
Your Changes (editable)
ZX Spectrum +3 (c) 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: 1. 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. 2. Dividing ROMCS into 2 lines, to disable both ROMs. 3. 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. 4. The keypad scanning routines from the ROM were removed. 5. 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. - SOURCES - Machine's bios. Machine's picture.
Explain Your Changes (required!)
Select Captcha:
