Where is the capacitor on a ZX Spectrum +2B issue 2 motherboard?
The ZX Spectrum +2B ISSUE 2 Motherboard (PDF file). Re-draw Revision 8, updated 2020-01-23. This schematic describes the circuit of a +2B with a Z70833 ISSUE 2 Motherboard. Some boards have the capacitor C53 fitted and some have a capacitor soldered to the underside of the board or CPU.
How many bytes of RAM does a ZX Spectrum microcomputer have?
1.1 INTRODUCTION A block diagram of the complete ZX Spectrum micro-computer is given below. It is valid for all build standards, fitted with either 16k or 48k bytes of dynamic RAM memory. Although functionally identical, detailed circuit changes have been introduced to improve reliability and to assist with manufacture.
Is Ula+ implemented in the ZX Spectrum core?
ULA+ implemented in the FPGA version of the core. Various ULA timming tests. Testing a ZX Spectrum clone running at 7MHz CPU clock speed. Part I. Testing a ZX Spectrum clone running at 7MHz CPU clock speed. Part II. Testing the Timex hicolor mode on a ZX Spectrum ULA enhanced clone.
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Who designed the ZX Spectrum Clon?
Chris designed a ZX Spectrum clon, the “Harlequin”. A PCB has been developed by Don “Superfo”, which uses discrete logic to implement the ULA, as Chris did. The CPLD version of this implementation is aimed to serve as replacement for that clone.
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Where can I find +2a/+2b/+3 family schematics?
Guesser’s Spectrum Schematics page covers the +2A/+2B/+3 family with excellently detailed redrawn schematics.
What is the clock speed of the Z80A?
The Z80A is an 8-bit single-IC central processing unit (CPU). It is clocked at 14.0 MHz from an external source controlled by the logic gate array (ULA) and has a standard three bus input/output arrangement.
What is the architecture of spectrum?
8 1.2 ARCHITECTURE The architecture of the Spectrum shown above is typical of many microcomputer systems in that it comprises a single microprocessor board (in this instance a Z80A or u780 CPU), a read only memory (ROM), an expandable RAM memory and an input/output section handling the keyboard, tape and TV display functions.
