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C't 512 KB internal RAM expansion

1,154 bytes added, 19:20, 7 May 2010
/* Newer Info */
* Unknown if it's fully dk'tronics compatible, or more like incompletely implemented Inicron variant
* Unknown what happens on accessing the unused region via OUT [7Fxxh],FCh..FFh
 
== PAL Source Code ==
 
D7D6 D0 D3 D4 D1 D2 NCAS A15 A14 GND
CPU A15S AMUX MUX LCLK CAS1 CAS0 IOWR A14S VCC
 
IF (VCC) /LCLK= D7D6 * /A15 * /IOWR
 
IF (VCC) /CAS0= /NCAS * /D4 +
/CAS0= /NCAS * A15 +
/CAS0= /NCAS * /A14 +
/CAS0= /NCAS * CPU
 
IF (VCC) /CAS1= /NCAS * D4 * /A15 * A14 * /CPU
 
IF (VCC) /A14S= /A14 +
/D0 * D2 * /A15 +
/D0 * D3 * /A15 +
/D0 * D4 * /A15
 
IF (VCC) /A15S= /A14 * /A15 +
/D1 * /A15 +
/D4 * /D3 * /D2 * /D0 * /A15 +
/D4 * /D3 * /D2 * /D1 * /A15
 
IF (VCC) /AMUX= /D0 * D1 * /D2 * /D3 * /D4 * /CPU * /MUX +
A15 * A14 * /D2 * D0 * /CPU * /MUX +
A15 * A14 * /D2 * D1 * /CPU * /MUX +
A15 * A14 * D3 * /CPU * /MUX +
A15 * A14 * D4 * /CPU * /MUX +
/A15 * A14 * D2 * /CPU * /MUX +
/A15 * A14 * D1 * /CPU * /MUX
 
IF (GND) /MUX = /MUX
 
IF (GND) /IOWR=/IOWR
== Newer Info ==
6,388
edits