PITFALLS I/O features: an actual device may or may not have internal pull-ups (ca. 50-100kΩ) or bus-keeper (ATF devices only) Don‘t rely on device marking solely; check for presence/absence of I/O features by using the GALmate read function Clamping: pin voltages >7V may trigger erratic device behavior due to transition into Edit mode or Register… Read more GAL hints & more
GAL specific information
Introduction This information is related to the programming mode of the PLDs listed below. Find more details in the Download section. GAL pinouts for EDIT mode GAL16V8/ATF16V8 GAL20V8/ATF20V8 GAL22V10/ATF22V10 GAL20XV10 GAL20RA10 GAL18V10 GAL26V12C GAL26CV12 GAL6001 GAL6002 GAL/ATF Architecture 16V8 & 20V8 detailed ACW bit information 16V8, 20V8 & 22V10 Row Addresses Map Block Diagram Download… Read more GAL specific information
FLOPPYmate hardware
INTRODUCTION FLOPPYmate requires an interface between the USB and the serial IEC bus. The hardware described in this Blog provides an interface (SER2IEC) between UART and the serial IEC bus for peripheral devices like disk drives 1540, 1541, 1570, 1571 and 1581. UART interface Decide on one of these UART interface types for your FLOPPYmate:USB… Read more FLOPPYmate hardware
C64 Track Display 1541, 1571
INTRODUCTION When working with a 15X1 floppy drive, it comes in quite handy to know the track, the drive is currently accessing. This blog presents a kind of drive-modding for 15X1 afficionados. FEATURES SINGLE IC GAL22V10 SOLUTION 2 DIGITS LATCHED BCD INTERFACE (0 TO 79) LET’S GET STARTED Circuit Description The State Machine in this… Read more C64 Track Display 1541, 1571
Vector Clock
INTRODUCTION In the late seventies vector graphic arcade video games like Asteroids became a huge success. A few years later the GCE Vectrex Home Arcade System was released. But even today the unique CRT phosphor glow hasn’t lost any of its fascination. This blog decribes a circuit which will turn a monochrome TV set into… Read more Vector Clock
Generating sine waves with a GAL
INTRODUCTION This is a simple approach using a GAL and an ADC to generate a sine wave. A simple State Machine is looping though 47 different states and outputting data words accordingly. In order to avoid unpredictable output sequences all states have to be unique. The requirement that each state has to be unique limits… Read more Generating sine waves with a GAL
FLOPPYmate software
OVERVIEW The FLOPPYmate application is a convenient tool for backing up individual PRG files and/or whole disks, sending DOS commands, as well as checking the drive’s spindle speed. Furthermore the data of a whole track can be displayed as binary and GCR. It’s the answer to how to fast backup and restore 1541, 1571 and… Read more FLOPPYmate software
GALmate hardware
HARDWARE OVERVIEW UART interface, 2x DCDC, ATmega16 Microcontroller, 2x PWM DAC, regulator LM723, OpAmp LM324, inverter CD4069 Supported devices Lattice, National, ST:GAL16V8, GAL18V10, GAL20V8, GAL20XV10, GAL20RA10, GAL22V10, GAL6001 (GAL39V18), GAL6002GAL26V12 & GAL26CV12 by using a simple 28-pin to 24-pin adapter Atmel:ATF16V8, ATF20V8, ATF22V10 FEATURES No parallel port and driver trouble Power over USB Programms all… Read more GALmate hardware
GALmate software
OVERVIEW The GALmate application lets you read and programm GAL devices.Whereas easyABEL and vDosPlus software provide a compiler suitable for ABEL-HDL design files. The compiler (easyABEL) and vDosPlus are optional. The application and related documents are provided in the download section below. FEATURES Sytem Requirements and Installation Operating System Windows 7 or later(Linux and OS… Read more GALmate software
6522 Fast Serial Driver
INTRODUCTION FLOPPYmate requires a high speed data transfer to read/write an entire track within a single disk revolution. This task requires a data transfer rate of at least 40KB/s. High speed (>8 KB/s) data transfer from or to a 1541 Disk Drive is commonly achieved using a 8 bit parallel cable connected to Port A… Read more 6522 Fast Serial Driver