Zilog

• IO expansion for ROMless operation of Z8 class microprocessors. Presents a sample telephone answering machine design based on Z89175AA/QFP microprossor with 512k (expandable to 1mb) of flash memory for digital OGM. The chip count is high (lots of extra decoding logic) and they are apparantly using the flash memory in a serial access mode (you can only start at the beginning and then get the next byte then the next etc...) rather than being able to specify any starting address (like the start of form macro number 2). They also provide only 8 bits of input and 8 output although that could be increased.
• z86017s PCMCIA interface chip Extreemly complex, devoted to use in PC's and other high end applications.
• Z8 OTP Compairison Guide
  • http://www.zilog.com/pdfs/develope/emulators/z86ccpze.pdf $99 in circuit emulator
  • App notes:
    • A low cost thermal printer
• Z8Plus
  • http://www.zilog.com/pdfs/z8otp/z8ice000zem.pdf $99 in circuit emulator
• Zx80 Instructions Compairison Guide @Intel
  • Z8S180/Z8L180  Enhanced Z180 Microprocessor Offers Faster Execution, Power-Saver  
    • Interfacing Memory and I/O to the 20 MHz Z8S180 System  uses an Xilog XP610 CPLD as "glue" logic to fix timing and logic problems involved in interfacing the Z8S180 to common memory devices
  • Z80189/Z8L189 General-Purpose Embedded Controllers
  • Z80185/195 Smart Peripheral Controllers
    • Chapter 11: Z80185 Bidirectional Centronics P1284 Controller
  • Z8S18000ZEM Low-Cost Emulator Uses an Altera FPGA. Not impressive, just a monitor and "emulator" but no mention of functions like single-step and breakpoints and no mention of guarentees about emulation modes being the same as running modes.

ZILOG seems to have this habit of changing their die and not telling people. Overall ZILOG is a good chip for selection, price, and are great number crunchers.

On any input you should have at least 150 mv. That means if you have a switch connected to the input directly you are in trouble. Fix: put a 1 Mohm resister on crystal pins.

Factory test mode accidentally may enable if osc1 input gets 9 volts noise for 3 ms. Use of product in noisy environment will cause "mystery" problems Fix: Put clamping diode one side to the VDD and the other side to the osc1 pin.

See also:

• http://www.righto.com/2013/09/the-z-80-has-4-bit-alu-heres-how-it.html Did you know the original Z80 had a 4 (that is FOUR) bit ALU? For each 8 bit operation, it did the low 4 bits first, saved the result in an internal register and then did the high 4 bits which it released along with the saved low bits as an 8 bit result.+
• http://www.eetasia.com/ARTICLES/2000SEP/2000SEP07_CT_MSD_PD_AN1.PDF?SOURCES=DOWNLOAD Z86C08 A2D Methods. PWM and RC Ramp, as well as Successive Approximation.+
• http://www.zilog.com/docs/appnotes/an_adc_conv.pdf Z86E08 A2D Methods. Successive Approximation and "Duty Cycle" (appears to be Sigma Delta) are included.
• http://www.zilog.com/docs/z8/appnotes/an_lcd.pdf Z86E08 Serial to LCD interface.+
• http://www.cate.com.au/download/Z8/index.html Z86E08 projects including bit bang, int based, UART TX and RX, keypad scanning, and multiplexed multi-digit 7-segment LED and VF displays.+
• Zilog Home Page
• http://www.zworld.com/cm7000.html
• http://sgate.emt.bme.hu/patai/publications/z80guide/app1.html Z80 instruction set and more.
• Dontronics Z80 page - really good stuff in the PBUF project
• Z80 Family "Official Support Page" - Really good
• http://www.ganssle.com/articles/az180.htm Article: The Z80 Lives!
• http://www.ganssle.com/articles/ammu.htm Article: Z180 Memory  Management
• http://www.jdm.homepage.dk/nomem.htm Running a Z80 without external RAM using a really tricky stack-in-ROM based system for parameters, calls and returns.
• http://www.jdm.homepage.dk/z80.htm SRAM and EPROM in series for CRT systems.
• http://www.jdm.homepage.dk/z80boot.htm A Z80 with SRAM but NO ROM (total of 2 chips: Z80 and SRAM) is bootloaded from a PC parallel port

I have 1560 Z86E0812PEC OTP microcontrollers.

Languages:

• http://sdcc.sourceforge.net/ Small Device C Compiler supports Z80 and the GameBoy clone.
• http://john.ccac.rwth-aachen.de:8000/as/ Assembler Supports the Z80, Z180, Z380, Z8, eZ8
• http://www.z88dk.org z88dk is a z80 C cross compiler supplied with an assembler/linker and a set of libraries implementing the C standard library for a number of different z80 based machines.
• http://www.bytecraft.com/Z8C_C_Compiler_for_Zilog_Z8 around $1k
• http://www.avocetsystems.com/company/techshee/tsheets/adc_adwide.html
• http://www.htsoft.com/products/compilers/CPM.php High Tech still has a (now free) C compiler for the Z80 for the CP/M OS! If you aren't sure what that means, it just isn't DOS or Windows and leave it at that...
• http://www.bdsoft.com/resources/bdsc.html Another now free and open source C compiler

Interested: