On this page you’ll find information about memory dram modules and expansion units for Amiga machines. Dram modules used on various amiga machines Amiga 1200 – Rev 1d HM514260JP8 Amiga 1200 – Rev 2B OKI M514800-80J ( datasheet ) Ram Expansion Amiga 600 Ram Expansions https://github.com/SukkoPera/OpenAmiga600RamExpansion This page is work in progress
Category: Amiga
Amiga mainboard frequencies
Frequenties overview Pal system HSync 15.625 KHz VSync 50.00028194 KHz PAL_Hz=Systemclock/227/312.5 28Mhz 28.37516 MHz 14Mhz 14,18758 7Mhz 7.09379 MHz Y451 4.43619 MHz Y621 3 MHz NTSC system HSync 15,750 KHz VSync 59.94005233 KHz NTSC_Hz=Systemclock/227.5/262.5 28Mhz 28.63636 MHz 14Mhz 14,31818 7Mhz 7.15909 MHz Y451 4.43619 MHz Y621 3 MHz
Amiga tank mouse fix x-axis
Repaired a broken Amiga tank mouse ( rev-D A0102200 ). No X-axis movement. I compared the voltage levels of the IR-phototransistors with the levels of the Y-axis. There is a difference between the working axis ( Y ) ~460mv and none working axis ( X ) ~240mv. Voltage level on X-axis, 240mV Replacing IR-phototransistors There […]
Amiga 1200 Right mousebutton does not work
A1200. right mousebutton not working. and everytime you press the right mousebutton you hear a SLIGHT click in the speaker.. HERE is the solution! ground (!ha!!) to paula have no connection to ground on the 1200.. measure marked pin to ground on the motherboard and you will not have a continunity.. so make sure it connects to ground. and it will […]
Amiga KickStart ROM Switcher with 27c800 eprom
For replacement kickstart roms for the Amiga you can use 27c400 ( 100/120ns ) 4Mbit ( 256Kbitx16bit ) eproms. Amiga 500,600 use 1 x 27c400, Amiga 1200, 4000 uses 2 x 27c400. datasheet M27C400 2 KickStart roms in 1 eprom For the 16 bit machines like Amgia 500,600, etc we can programm 2 KickStart rom […]