View allAll Photos Tagged am95
Ferrari California
___________________________________________________________
Facebook account || Facebook page || Google + || Twitter || 500px || Vimeo
Litronix DL2416T: a four digit display module wilh16 bar segments plus a decimal and a built-in CMOS integrated circuit.
The integrated circuit contains memory, latched ASCII character
generator, multiplexing circuitry and drivers. Data entry is
asynchronous and can be random.
Colour: Desert Sand/Sunset Tint-Black
Not tennis shoes, but I love these kicks. My main casual pair.
Roger Federer's NikeCourt Vapor X Air Max 95 Remix.
Debuted by Federer at The Match for Africa 5 - Silicon Valley, vs. Jack Sock
Colour: Black/Volt Medium Ash
Style: AO8759 078
Roger Federer's NikeCourt Vapor X Air Max 95 "Neon" Remix.
Debuted by Federer at The Match for Africa 5 - Silicon Valley, vs. Jack Sock
Style: AO8759 078
Colour: Black/Volt Medium Ash
Roger Federer's NikeCourt Vapor X Air Max 95 Remix.
Debuted by Federer at The Match for Africa 5 - Silicon Valley, vs. Jack Sock
Roger Federer's NikeCourt Vapor X Air Max 95 "Greedy" Remix.
A one match wonder, used by Federer against Thanasi Kokkinakis at the Miami Open, 2018.
My fourth training Z80 board, completed with vent power supply, Z80 ceramic purple Mostek-Zilog CPU, ROM 8K (Bios plus main programs), RAM 8 + 8K (SRAM or NVRAM) , SIO RS-232 USART 8251, PIO 8255, 25 pin IBM PC Standard Parallel Port bidirectional nibble mode interface, additional memory mapped 8bit parallel I/O, E2/Eprom programmer via HW bit-to-bit or SW with ZIF sockets, programmable tone generator (555 as orgue), Hex keyboard (74C923), Hex LED Display, ASCIII 16 segment LED Display (DL2416), 3 Clocks types ( 2.5MHz; 4 Hz; instruction stepping), dip switches for interrupt Zero Mode, Windows Visual Basic Software for serial & parallel data transmission between the Z80 and an IBM Personal Computer. Quite all components are vintage original 1980's
Roger Federer's NikeCourt Vapor X Air Max 95 "Greedy" Remix.
A one match wonder, used by Federer against Thanasi Kokkinakis at the Miami Open, 2018.
Roger Federer's NikeCourt Vapor X Air Max 95 "Greedy" Remix.
A one match wonder, used by Federer against Thanasi Kokkinakis at the Miami Open, 2018.
AMD produced what is probably the first floating point "coprocessor" for microprocessors, the AMD 9511 "arithmetic circuit" (1979), which performed 32 bit (23 + 7 bit floating point) RPN-style operations (4 element stack) under CPU control.
________________________________________________________________
AM9511 APU (arithmetic processing unit) performs floating point calculations that would be too time-consuming or cumbersome if done on Z80 microprocessor.
In addition to the four basic operations, the 9511 can implement transcendental functions (sin, log, etc.), and it can also perform conversion from floating point to fixed point and vice versa. It can also perform operations in 16 or 32 bit fixed point two's complement integer representation.
The fastest instruction is 16 bit fixed point addition which takes 4 microsec, the slowest instruction is arc-tangent which takes almost 2 milisec; 32 bit floating point addition takes 14-87 microsec.
The 9511 is an autonomous processor: it acts like a peripheral and it in not tied to any particular microcrocessor. AM9511 is configured as a pair of I/O ports with the capability of causing the Z80 to pause for completion of the processor's operation if it has not been completed by the time the Z80 code requires the results.
The 9511 is a stack orientaded processor. Operands are first pushed onto the internal stack, and then a comand is issued to the processor to perform an operation on the stack. Results are removed from the stack.
All transfers, including operands, results, status and command information, take place over an 8-bit bidirectional data bus. The internal data paths and the internal ALU are 16 bits wide, even though some operations are on 32 bits operands (this fact indicates that extending the 9511 to handle double precision format could have been implemented internally quite easily). The transcendental functions are evaluated using Chebyshev Polynomials which provide an even distribution of errors within the selected data representation.
The 9511 was in 1980's an high cost device: the APU was far more complex than the CPU and the volume of sales was not so high. As a result this was reflected in the price: in 1983 the Am9511@2Mhz cost £90 (considering inflation it would cost £240 now in 2009), the 3Mhz £123.75, the 4Mhz £146.25 ..