Computer Chips from yesteryear
Posted: 09 Jan 2015 17:03
When you look back at the early eighties computer you think of chunky ZX Spectrum Graphics and Beeps , ZAPs and other crude sound effects... but what really was avilable to computer designers.... money being no object...
CPUs
Intel 8080/8085/8086
One of the first mainstream CPUs. This CPU is quite strange as it wasn't particularly very good even for it's day, but was used in the IBM PC and the rest is history..Spawned the 80286,80368,80486, Pentium etc, etc
The 6502
Being one of the cheapest CPUs at the time it was used in a lot of machines like the C64,Atari 800, BBC , ORIC etc etc..Simple internally and easy to source made it a common choice... was followed by the 65C816 as used in the SNES. These are still made today by Western Design Centre !
Z80..
Probably the mot common CPU of the eighties, had several derivatives..HD64180, Z180,Z380 etc etc..still much used by hobbyists and homebrew builders. And I believe still in production in one form or another ?
6809
Possibly the best 8 bit microprocessor of it's day..Not used other than the Tandy and Dragon computers, mainly due to it's high price.. followed by the HD6309 which is an enhanced version and pin compatible , making it a drop in replacement for a 6809 ! No longer in production.
TMS9900 & TMS9995
A Rare and unusual beast.. only used in the TI-99/4A, Tommy Tutor and Powertran Cortex (Home build) Machines? Had many advanced features for it's day as it was derived from a Mini-computer design. Quite Qerky with some idiosyncrasies. Not much used probably due to it's high price.. Well worth a look as it had an advanced design for it's day. No longer in production, can be found as NOS or Pulls also a VHDL model exists.
Motorola 68000
The Rolls-Royce of home micro CPUs.. used in the Atari ST, Amiga and Sinclair QL.. thought very cool at the time.
Acorn-RISC.
A Super-advanced design by ACORN used in the Archimedes computer range.. now lives on in most mobile phones and tablet like devices.
There are of course lots of other CPUs.. but they never really caught on the Z8000 to name one !
Sound Chips..
TI SN76480
A small an inexpensive sound Chip, commonly used in Z80 machins..like the Colecovision, Sord M5, and Memotech MTX. Can still be sourced very cheaply.
AY-3-8910
This was the sound chip used in the MSX machines, also used in the Amstrad CPC. A alter version YM2149 was used in the Atari ST. Still can be sourced
Phillips SAA1099.
This was a powerful and compact chip (DIP18) only used in the SAM COUPE. These can still be found quite easily and are cheap.
YM3812
This was an advanced MSX+ Chip used in later MSX machines and Sound Card also used in some PC Cards.. Very powerful.. These can still be sourced today for $1.50 !!
Video Chips... It was mainly the crude and chunky graphics that defined early home Micros..let's see what chips where available !
The Thomson EF936x is a type of Graphic Display Processor (GDP). The chip could draw at 1 million pixels per second, which was relatively advanced for the year of its release (1982). Versions
Plastic or Ceramic
EF9364
EF9365 512×512 (interlaced), 256×256, 128×128, 64×64
EF9366 512×256 (noninterlaced)
EF9367 1024×512
Also made SECAM Version for FRANCE
Capabilities
Integrated DRAM controller
Linedrawing, with delta-x and delta-y limited to 255 each. Support for solid, dotted, dashed and dotted/dashed lines.
Built-in 5×8 pixel ASCII font. Support for rendering tilted characters, and scaling by integer factors (of course no antialiasing)
Clear screen
The GPUs did not support direct access to the graphics memory, although a special command was provided to aid in implementing access to individual memory words.
The MC6845 and later R6545 where cheap enough to use in home micros like the BBC B, And Amstrad CPC.. at the time they where 'Cool' still used by a lot of homebrew designers !
The V6366 Was an ehhanced version , an evolution of the 6845, used in early PC Cards I beleive.
The TMS9929/V9938/V9958 needs no explanation , used in lots of Z80 systems, Namely MTX, MSX etx etc
The NEC 7220 / D72020
The High-Performance Graphics Display Controller 7220 (commonly µPD7220 or NEC 7220) is a video interface controller capable of drawing lines, circles, arcs, and character graphics to a bit-mapped display. It was developed by NEC and used in NEC's APC III computers, the optional graphics module for the DEC Rainbow, the Tulip System-1, and the Epson QX-10.[1]
The µPD7220 was one of the first implementations of a graphics display controller as a single Large Scale Integration (LSI) integrated circuit chip, enabling the design of low-cost, high-performance video graphics cards such as those from Number Nine Visual Technology. It became one of the best known of what became known as graphics processing units in the 1980s.
Amazingly all these chips are still avilable as legacy NOS or Pulls.. Chips like the EF936x and D7220 may of costs hundreds of dollars each back in their day.. but now only cost a fraction of that.
CPUs
Intel 8080/8085/8086
One of the first mainstream CPUs. This CPU is quite strange as it wasn't particularly very good even for it's day, but was used in the IBM PC and the rest is history..Spawned the 80286,80368,80486, Pentium etc, etc
The 6502
Being one of the cheapest CPUs at the time it was used in a lot of machines like the C64,Atari 800, BBC , ORIC etc etc..Simple internally and easy to source made it a common choice... was followed by the 65C816 as used in the SNES. These are still made today by Western Design Centre !
Z80..
Probably the mot common CPU of the eighties, had several derivatives..HD64180, Z180,Z380 etc etc..still much used by hobbyists and homebrew builders. And I believe still in production in one form or another ?
6809
Possibly the best 8 bit microprocessor of it's day..Not used other than the Tandy and Dragon computers, mainly due to it's high price.. followed by the HD6309 which is an enhanced version and pin compatible , making it a drop in replacement for a 6809 ! No longer in production.
TMS9900 & TMS9995
A Rare and unusual beast.. only used in the TI-99/4A, Tommy Tutor and Powertran Cortex (Home build) Machines? Had many advanced features for it's day as it was derived from a Mini-computer design. Quite Qerky with some idiosyncrasies. Not much used probably due to it's high price.. Well worth a look as it had an advanced design for it's day. No longer in production, can be found as NOS or Pulls also a VHDL model exists.
Motorola 68000
The Rolls-Royce of home micro CPUs.. used in the Atari ST, Amiga and Sinclair QL.. thought very cool at the time.
Acorn-RISC.
A Super-advanced design by ACORN used in the Archimedes computer range.. now lives on in most mobile phones and tablet like devices.
There are of course lots of other CPUs.. but they never really caught on the Z8000 to name one !
Sound Chips..
TI SN76480
A small an inexpensive sound Chip, commonly used in Z80 machins..like the Colecovision, Sord M5, and Memotech MTX. Can still be sourced very cheaply.
AY-3-8910
This was the sound chip used in the MSX machines, also used in the Amstrad CPC. A alter version YM2149 was used in the Atari ST. Still can be sourced
Phillips SAA1099.
This was a powerful and compact chip (DIP18) only used in the SAM COUPE. These can still be found quite easily and are cheap.
YM3812
This was an advanced MSX+ Chip used in later MSX machines and Sound Card also used in some PC Cards.. Very powerful.. These can still be sourced today for $1.50 !!
Video Chips... It was mainly the crude and chunky graphics that defined early home Micros..let's see what chips where available !
The Thomson EF936x is a type of Graphic Display Processor (GDP). The chip could draw at 1 million pixels per second, which was relatively advanced for the year of its release (1982). Versions
Plastic or Ceramic
EF9364
EF9365 512×512 (interlaced), 256×256, 128×128, 64×64
EF9366 512×256 (noninterlaced)
EF9367 1024×512
Also made SECAM Version for FRANCE
Capabilities
Integrated DRAM controller
Linedrawing, with delta-x and delta-y limited to 255 each. Support for solid, dotted, dashed and dotted/dashed lines.
Built-in 5×8 pixel ASCII font. Support for rendering tilted characters, and scaling by integer factors (of course no antialiasing)
Clear screen
The GPUs did not support direct access to the graphics memory, although a special command was provided to aid in implementing access to individual memory words.
The MC6845 and later R6545 where cheap enough to use in home micros like the BBC B, And Amstrad CPC.. at the time they where 'Cool' still used by a lot of homebrew designers !
The V6366 Was an ehhanced version , an evolution of the 6845, used in early PC Cards I beleive.
The TMS9929/V9938/V9958 needs no explanation , used in lots of Z80 systems, Namely MTX, MSX etx etc
The NEC 7220 / D72020
The High-Performance Graphics Display Controller 7220 (commonly µPD7220 or NEC 7220) is a video interface controller capable of drawing lines, circles, arcs, and character graphics to a bit-mapped display. It was developed by NEC and used in NEC's APC III computers, the optional graphics module for the DEC Rainbow, the Tulip System-1, and the Epson QX-10.[1]
The µPD7220 was one of the first implementations of a graphics display controller as a single Large Scale Integration (LSI) integrated circuit chip, enabling the design of low-cost, high-performance video graphics cards such as those from Number Nine Visual Technology. It became one of the best known of what became known as graphics processing units in the 1980s.
Amazingly all these chips are still avilable as legacy NOS or Pulls.. Chips like the EF936x and D7220 may of costs hundreds of dollars each back in their day.. but now only cost a fraction of that.