RAM: 512 kB
ROM: 128 kB
support 4 memory layout modes
software control of jumper "EPROM"
software control of "MAPRAM" (set/reset)
allram modes with 16kB paging
8kB+8kB allram modes


MEMORY LAYOUT  0

Port 227 in DivIDE mode:
D0-D5 = 8kB memory page 0-63
(D2-D5 select too 8kB rom pages 0-15 = for each block of 32kB ram is used new rom page)
D6 = mapram
D7 = conmem

Port 227 in ALLRAM mode:
D0-D4 = 16kB memory page (0-31)
D6 = 1-write enable ram / 0-write protect ram
D7 = allram mode off
In allram mode is NMI button enable only after jump to map-off area (1FF8-1FFF)


MEMORY LAYOUT  1

Port 227 in DivIDE mode:
This layout use 4x (8kB rom+128kB ram)
D0-D3 = 8kB memory page 0-15
D4-D5 = select memory block 0-3 (one block = 8kB rom + 128kB ram)
D6 = mapram
D7 = conmem

Port 227 in ALLRAM mode:
In allram mode is from adress 0-8192 set page 0 of 128 kB memory block
and 8192-16383 = page 0-15 of 128kB memory block
D0-D1 = number of 128kB block (0-3)
D2-D5 = 8kB memory page of actual block 128kB from adress 8192 (0-15)
D6 = 1-write enable ram / 0-write protect ram
D7 = allram mode off
In allram mode is NMI button always enable


MEMORY LAYOUT  2

Port 227 in DivIDE mode:
This layout use 32kB rom+32kB ram
D0-D1 = 8kB memory page 0-3 from adress 8192
D2-D5 = select 8kB rom 0-15 from adress 0
D6 = mapram
D7 = conmem

Port 227 in ALLRAM mode:
In allram mode is from adress 0-8192 ram page 0-15 of 128 kB memory block
and from 8192-16383 = ram page 0 of 128 kB memory block
D0-D1 = number of 128kB block (0-3)
D2-D5 = 8kB memory page of actual block 128kB from adress 0 (0-15)
D6 = 1-write enable ram / 0-write protect ram
D7 = allram mode off
In allram mode is NMI button always enable


MEMORY LAYOUT  3

Port 227 in DivIDE mode:
D0-D5 = 8kB memory page 0-63
(D2-D5 select too 8kB rom pages 0-15 = for each block of 32kB ram is used new rom page)
D6 = mapram
D7 = conmem

Port 227 in ALLRAM mode:
D0-D4 = 16kB memory page (0-31)
D6 = 1-write enable ram / 0-write protect ram
D7 = allram mode off
In allram mode is NMI button always enable (best for RESIDOS, BS-DOS)

EXTRA FEATURES

All extra features can be used by OUT 227,BIN 11xxxxxx (CONMEM=1 and MAPRAM=1)
Features port:

D0-D1
D2-D3
D4
D5
D6-D7

= unused
= DivIDE memory layout mode (0-3) - after power-on is set mode 0
= state of switch JP2 (EPROM) - 0=switch on / 1=switch off
= unused
= must be set to 1

CODE EXAMPLES
(WARNING: all instructions OUT 227,11xxxxxx must be in ZX ram only - bit D7 connect DivIDE rom page to low 8kB and code can crash.

- OUT 227,00pppppp - set divide page / allram page + write disable
- OUT 227,01pppppp - set divide page + mapram / allram page + write enable
- OUT 227,10pppppp - set divide page + active conmem(rom) / disable allram mode
- OUT 227,11pppppp - change extra features + disable allram page

Reset port 227 from DivIDE or ALLRAM mode (reset mapram):
OUT 227,11010000 - disable switch JP2 (open) + set mode 0
OUT 227,11000000 - switch JP2 is disable than this out reset mapram + set mode 0 + JP2=on
OUT 227,xx000000 - set new value of port 227 (xx can't be 11)

Reset port 227 from ALLRAM mode only (reset mapram):
OUT 227,11000000 - switch JP2 is disable than this out reset mapram + set mode 0 + JP2=on
OUT 227,xx000000 - set new value of port 227 (xx can't be 11)
This is short version of previous code. Function is same but work only if allram mode is active