Intel 8. 08. 5 - Wikipedia. The Intel 8. 08. 5 (. However, it requires less support circuitry, allowing simpler and less expensive microcomputer systems to be built. The . This brought it up with the competing Z8. CPU introduced the year before. These processors could be used in computers running the CP/M operating system. The 8. 08. 5 is supplied in a 4. DIP package. To maximise the functions on the available pins, the 8. However, an 8. 08. Intel manufactured several support chips with an address latch built in. These include the 8. KB of EPROM and 1. I/O pins, and the 8. RAM, 2. 2 I/O pins and a 1. The multiplexed address/data bus reduced the number of PCB tracks between the 8. NIST's computer security publications (FIPS, NIST Special Publications, NISTIRs and ITL Security Bulletins) grouped by topic. Compensation; Classified Staff; Job title list and specs; Job title list and specs. For more information on the subjects and terms used on this table, see the UW compensation plan guide and glossary. For printable versions of. Sparks AAA 1 Mite Minor Team Wins Presidents' Day Tournament! Congratulations to the Minuteman Sparks 2007 Mite Minor AAA Division 1 Team on winning the Presidents' Day Mite Invitational Tournament! SynEdit SynEdit is a syntax highlighting edit control, not based on the Windows common controls. SynEdit compiles with both Delphi and Kylix, and should work with CBuilder, although this is *not* officially supported. Want to watch this again later? Sign in to add this video to a playlist. I/O chips. Both the 8. Zilog Z8. 0 for desktop computers, which took over most of the CP/M computer market, as well as a share of the booming home- computer market in the early- to- mid- 1. The 8. 08. 5 had a long life as a controller, no doubt thanks to its built- in serial I/O and 5 prioritized interrupts, arguably microcontroller- like features that the Z8. CPU did not have. Once designed into such products as the DECtape controller and the VT1. This was typically longer than the product life of desktop computers. Description. Unlike the 8. State signals are provided by dedicated bus control signal pins and two dedicated bus state ID pins named S0 and S1. Pin 4. 0 is used for the power supply (+5 V) and pin 2. Pin 3. 9 is used as the Hold pin. Pins 1. 5 to 8 are generally used for address buses. Only a single 5 volt power supply is needed, like competing processors and unlike the 8. The 8. 08. 5 uses approximately 6,5. A downside compared to similar contemporary designs (such as the Z8. Intel 8. 15. 5, 8. The 8. 08. 5 has extensions to support new interrupts, with three maskable vectored interrupts (RST 7. RST 6. 5 and RST 5. TRAP), and one externally serviced interrupt (INTR). Each of these five interrupts has a separate pin on the processor, a feature which permits simple systems to avoid the cost of a separate interrupt controller. The RST 7. 5 interrupt is edge triggered (latched), while RST 5. All interrupts are enabled by the EI instruction and disabled by the DI instruction. In addition, the SIM (Set Interrupt Mask) and RIM (Read Interrupt Mask) instructions, the only instructions of the 8. RST interrupts to be individually masked. All three are masked after a normal CPU reset. SIM and RIM also allow the global interrupt mask state and the three independent RST interrupt mask states to be read, the pending- interrupt states of those same three interrupts to be read, the RST 7. SOD and SID pins, respectively, all under program control and independently of each other. SIM and RIM each execute in 4 clock cycles (T states), making it possible to sample SID and/or toggle SOD considerably faster than it is possible to toggle or sample a signal via any I/O or memory- mapped port, e. An improvement over the 8. MHz crystal would yield a 3. MHz clock, for instance). The internal clock is available on an output pin, to drive peripheral devices or other CPUs in lock- step synchrony with the CPU from which the signal is output. The 8. 08. 5 can also be clocked by an external oscillator (making it feasible to use the 8. CPUs, or to synchronize the CPU to an external time reference such as that from a video source or a high- precision time reference). The 8. 08. 5 is a binary compatible follow up on the 8. It supports the complete instruction set of the 8. CPU flags (except for the AND/ANI operation, which sets the AC flag differently). It is of course possible that the actual 8. The other six registers can be used as independent byte- registers or as three 1. BC, DE, and HL, depending on the particular instruction. Some instructions use HL as a (limited) 1. As in the 8. 08. 0, the contents of the memory address pointed to by HL can be accessed as pseudo register M. It also has a 1. 6- bit program counter and a 1. Instructions such as PUSH PSW, POP PSW affect the Program Status Word (accumulator and flags). The accumulator stores the results of arithmetic and logical operations, and the flags register bits (sign, zero, auxiliary carry, parity, and carry flags) are set or cleared according to the results of these operations. The sign flag is set if the result has a negative sign (i. The auxiliary or half carry flag is set if a carry- over from bit 3 to bit 4 occurred. The parity flag is set according to the parity (odd or even) of the accumulator. The zero flag is set if the result of the operation was 0. Lastly, the carry flag is set if a carry- over from bit 7 of the accumulator (the MSB) occurred. Commands/instructions. Some of them are followed by one or two bytes of data, which can be an immediate operand, a memory address, or a port number. Like larger processors, it has CALL and RET instructions for multi- level procedure calls and returns (which can be conditionally executed, like jumps) and instructions to save and restore any 1. There are also eight one- byte call instructions (RST) for subroutines located at the fixed addresses 0. These are intended to be supplied by external hardware in order to invoke a corresponding interrupt- service routine, but are also often employed as fast system calls. One sophisticated instruction is XTHL, which is used for exchanging the register pair HL with the value stored at the address indicated by the stack pointer. For two- operand 8- bit operations, the other operand can be either an immediate value, another 8- bit register, or a memory cell addressed by the 1. HL. The only 8- bit ALU operations that can have a destination other than the accumulator are the unary incrementation or decrementation instructions, which can operate on any 8- bit register or on memory addressed by HL, as for two- operand 8- bit operations. Direct copying is supported between any two 8- bit registers and between any 8- bit register and a HL- addressed memory cell, using the MOV instruction. An immediate value can also be moved into any of the foregoing destinations, using the MVI instruction. Due to the regular encoding of the MOV instruction (using nearly a quarter of the entire opcode space) there are redundant codes to copy a register into itself (MOV B,B, for instance), which are of little use, except for delays. Any of the three 1. BC, DE, HL or SP) can be loaded with an immediate 1. LXI), incremented or decremented (using INX and DCX), or added to HL (using DAD). LHLD loads HL from directly- addressed memory and SHLD stores HL likewise. The XCHG operation exchanges the values of HL and DE. Adding HL to itself performs a 1. The only 1. 6 bit instruction that affects any flag is DAD (adding HL to BC, DE, HL or SP), which updates the carry flag to facilitate 2. Adding the stack pointer to HL is useful for indexing variables in (recursive) stack frames. A stack frame can be allocated using DAD SP and SPHL, and a branch to a computed pointer can be done with PCHL. These abilities make it feasible to compile languages such as PL/M, Pascal, or C with 1. Subtraction and bitwise logical operations on 1. Operations that have to be implemented by program code (subroutine libraries) include comparisons of signed integers as well as multiplication and division. Undocumented instructions. Sorensen in the process of developing an 8. These instructions use 1. This I/O mapping scheme is regarded as an advantage, as it frees up the processor's limited address space. The IN and OUT instructions are used to read and write I/O port data. In an I/O bus cycle, the 8- bit I/O address is output by the CPU on both the lower and upper halves of the 1. Memory mapped I/O devices can also be accessed by using the LDA (load accumulator from a 1. STA (store accumulator at a 1. Development system. The original development system had an 8. Later 8. 08. 5 and 8. ICE (in- circuit emulators). It is a large and heavy desktop box, about a 2. Later an external box was made available with two more floppy drives. It runs the ISIS operating system and can also operate an emulator pod and an external EPROM programmer. This unit uses the Multibus card cage which was intended just for the development system. A surprising number of spare card cages and processors were being sold, leading to the development of the Multibus as a separate product. The later i. PDS is a portable unit, about 8. It has a small green screen, a keyboard built into the top, a 5. It can also accept a second 8. The screen and keyboard can be switched between them, allowing programs to be assembled on one processor (large programs took awhile) while files are edited in the other. It has a bubble memory option and various programming modules, including EPROM, and Intel 8. In addition to an 8. Intel produced a number of compilers including those for PL/M- 8. Pascal, and a set of tools for linking and statically locating programs to enable them to be burned into EPROMs and used in embedded systems. A lower cost SDK- 8. System Design Kit board contains an 8. CPU, an 8. 35. 5 ROM containing a debugging monitor program, an 8. RAM and 2. 2 I/O ports, an 8. LED, and a TTY (Teletype) 2. A current loop serial interface. Pads are available for one more 2. K. All data, control, and address signals are available on dual pin headers, and a large prototyping area is provided. Applications. These instructions are written in the form of a program which is used to perform various operations such as branching, addition, subtraction, bitwise logical, and bit shift operations. More complex operations and other arithmetic operations must be implemented in software. For example, multiplication is implemented using a multiplication algorithm. The 8. 08. 5 processor was used in a few early personal computers, for example, the TRS- 8. Model 1. 00 line used an OKI manufactured 8. C8. 5 (MSM8. 0C8. ARS). The CMOS version 8. C8. 5 of the NMOS/HMOS 8. In the Soviet Union, an 8. C8. 5 clone was developed under the designation IM1. VM8. 5A (Russian: . The Swiss company SAIA used the 8.
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