SmallZ80 Update Log


04 Mar 2021
New EEPROM and CF images (both Z80 & Z180) are posted for download.  The EEPROM HEX files for Z80 & Z180 machines are in the same download - pay attention to the filenames.  The EEPROM code changes reflect an update to the floppy boot code and an update to the RamTest display header.  The CF modules also reflect changes to the floppy driver, plus new software (ALFCOPY.COM) that allows copying files to/from the FAT filesystem on a USB Thumb drive or an SD Card used with the Alfat+2S expansion adapter (new style adapter only.  For old style adapters, contact Terry.)
22 Feb 2021
There is a bug in the Z80 EEPROM code v4.00.03.  The bug has been corrected and the new code (v4.00.04, dated 2/22/21) has been posted.  The same 'combined' format with Z180 and Z80 .HEX files is posted.  The Z180 code is unchanged from the .03 version so there's no need to update a Z180 machine with the v.04 code.
21 Feb 2021
Updated CF images, EEPROM HEX files, and the User Manual are posted in Downloads.  The new BIOS code provides better handling of Floppy I/O and some bug fixes.
08 Jan 2021
New Z80 Distro EEPROM code and CF image are posted.  The 4.00.00 CF was missing the A16: files that are copied to the RamDisk during the boot process.  The EEPROM code was missing a few lines of code that forced the system to remain in slow speed when J4 was installed.  The Z180 EEPROM code was also affected, but the Z180 does not execute the clock speed change code (all Z180 speed changes are accomplished via adding/subtracting wait states.)  Z180 users will get the (unneeded) code segment with the next Z180 update.
27 Dec 2020
We're taking orders on the Z180 CPU Upgrade.  Shipping will start Monday, 28 December.  We've posted new HEX files for the Z180 and Z80 versions of the EEPROM code (port40 update required!) as well as an updated User Manual.  The CF images for Z80 and Z180 (both Port40!) systems are now posted.  The New-Style Floppy+2S adapter is tested and ready for shipping.  All original I/O Map software and firmware are final - they will remain available for download but they will not be updated any further.
10 Nov 2020
The hyperlink for downloading the I/O Map update is restored.
7 Nov 2020
Posted new image for modifying the I/O mapping of the SmallZ80, moving the ports from a base address of 10H to a base at 40H.  The purpose of the change is to make the SmallZ80 I/O map identical to the SmallZ-180 map.
The SmallZ-180 Production PCB can be seen here.  The hardware is ready; software is being finalized.
7 Aug 2019
Posted new CF image with corrected BootSet labels.
5 August 2019
New User Manual, CF-IDE image, and EEPROM code are posted for download.  The new code (EEPROM and BIOS v2.02) allows the SmallZ80 to accept Terminal connections via the Internet.
11 March 2019
The SmallZ80 Services and Prices page had been updated.
6 March 2019
The latest v2 CF and EEPROM images are posted in the downloads section.  The Clock Control Module is available for all Rev E1 CPU boards, and is required when using the v2 CF and EEPROM software.  The new LAN + ALFAT adapter can provide a connection to either the ALFAT OEM or the ALFAT USB daughterboard.  The only difference is that the ALFAT OEM adds an SD Card slot and a 2nd USB port to the single USB port on the ALFAT USB.  These adapters allow you to copy files from the FAT-based USB Thumb Drive or SD Card into the SmallZ80.  This is a fast and easy way to get Internet-based programs, files, and data into your SmallZ80 machine.  Likewise, you can also write your CP/M files directly to the FAT-based media, which can then be transmitted via e-mail or uploaded to an FTP site.  Both expansion adapters (Floppy and LAN + ALFAT) also provide a 10/100BaseT LAN connection, used primarily for a lightening-fast 921K Baud terminal connection.
One of our customers has created and posted a 6-minute YouTube video describing the SmallZ80 in operation.  You can view it here.
17 December 2018
The SmallZ80 User Manual has a minor update that reflects comments received from builders.
9 December 2018
The SmallZ80 is now shipping.  User Manual, CF Image, and distribution EEPROM HEX file are posted.  A scan of the production PCB is here
14 November 2018
We've finalized the design and system configuration.  The main CPU Oscillator has been set to 20MHz with the UART and Slow speed CPU Oscillator at 14.7456MHz.   The Mainboard serial ports are fully operational and reliable up to 460,800 baud, which makes for a lightening fast terminal.  The Expansion board serial ports can operate up to 921,600 baud, primarily intended for communicating with the LAN processor for LAN-based terminal and printer I/O.
Pricing data will be updated within a few days, leading to taking advanced orders and PCB production within the week.
30 October 2018
The Rev E0 CPU board is tested and updated to the final Rev E1 configuration.  Production boards will be ordered within two weeks.  The current oscillator configuration is a 25MHz high speed  system oscillator and a 14.7456MHz UART oscillator, which will also supply the CPU low speed clock.  This configuration will allow baud rates up to 921,800 baud for blazing fast display updates.  A new User Manual and CF image have been posted in the download area.
10 October 2018
The Software/Firmware is undergoing rapid development.  The latest CF and Floppy images, EEPROM Code, and User Manual were recently posted.
21 September 2018
Development continues on the SmallZ80 system.  The final hardware configuration is fairly well developed, with a few minor issues remaining.  A new PCB will be forthcoming soon, which will then be made available to hobbyists.
23 August 2018
The SmallZ80 has completed the initial design and testing phases, and is shifting into more widespread testing.  A few prototype kits are available for the adventurous.  The Floppy + 2S expansion board is now entering the test and software development process.  The SmallZ80 CPU board measures about 6.5" wide x 5" front-to-back.  Adding the dual CF adapter widens the footprint to about 9".  The entire system is powered by a 5v, 2.5A wall wart transformer.
The LAN option replaces the Terminal and Printer serial I/O ports with a TCP232-E embedded serial-to-Ethernet module.  With the LAN option, Terminal I/O runs at 230,400 baud with CTS/RTS handshaking for nearly instantaneous terminal display updates.  LAN-based Printer I/O runs at 115,200 baud without handshaking.


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