Soundbastard glue logic 1
Harrie van Dijck, Anton Verheijen
05-03-2000

CHIP SBGLUE1  GAL22V10

; MM (memory model)
; 0  normal mode (RAM and ROM separated)
; 1  debug mode  (RAM and ROM in same address space)
;
; IO in both modes only in data memory and never in program memory
;
; $FF00-$FF07:  CS0 of ATA
; $FF08-$FF0F:  CS1 of ATA

 NRD  NWR NPSEN  MM  IRQATA  IRQMAS    A3      A4      A5     A6    A7    GND
; 1    2    3    4     5       6       7       8       9      10    11    12
; 13   14   15   16    17      18      19      20      21     22    23    24
 NSEL  A15  A14  A13 NIRQMAS NIRQATA NCS1ATA NCS0ATA NRDROM NWRRAM NRDRAM VCC

@UES SBGLUE1

EQUATIONS

/NIRQMAS = IRQMAS
/NIRQATA = IRQATA     
/NCS1ATA = /NSEL*/A7*/A6*/A5*/A4* A3
/NCS0ATA = /NSEL*/A7*/A6*/A5*/A4*/A3
/NRDROM  = /MM*/NPSEN    + MM*/NPSEN*/A15*/A14*/A13    +
                           MM*NSEL*/NRD*/A15*/A14*/A13
/NWRRAM  = /MM*NSEL*/NWR + MM*/NWR*NSEL*A15            + MM*/NWR*NSEL*A14 +
                           MM*/NWR*NSEL*A13
/NRDRAM  = /MM*NSEL*/NRD + MM*/NPSEN*A15               + MM*/NPSEN*A14    +
                           MM*/NPSEN*A13               + MM*/NRD*NSEL*A15 +
                           MM*/NRD*NSEL*A14            + MM*/NRD*NSEL*A13