Changes
A 64KB memory expansion by [[MHT Ingenieros]].
A Spanish manufactured memory expansion intended for the Spanish market.
Originally the internal ROM is located in bank 2.
It expanded BASIC with various RSX commands (software in ROM) to allow access to the additional banks.
Features: peek and poke, Screen flipping, Printer buffer, random access to files.
The price was: 13.900 pts.
== Advert ==
[[Image:ANTA64K-advert.jpg]]
== Pictures ==
<gallery>
Image:Anta64K3_Top.jpg|Unit front
Image:Anta64K3_Bottom.jpg|Unit back
Image:Anta64K3_PCB_Top.jpg|PCB top
Image:Anta64K3_PCB_Bottom.jpg|PCB bottom
</gallery>
== Technical ==
* Uses port &F8F8, &FADD and centronics strobe.to latch data (read/write)* Data is Uses memory address to define where in 64KB ram to read one byte at a time using &F8F8* Data is written one byte at a time using &F8F8/write.
* NOT Dk'Tronics compatible.
* More like a ram disc
to write:
LD BC,&F8F8 ;; ram data access
LD A,&34 ;; value to write
LD DE,&4000 ;; where in extra ram to read (0-&ffff)
DI
OUT (C),A ;; latch data for ram
LD A,(DE) ;; perform write into ram
EI
to read:
LD BC,&F8F8
ld de,&4000
di
in a,(c)
ld a,(de) ;; read value from extra ram
ei
each access to the I/O port must be followed by a memory read operation.
ROM uses single byte reads such as LD A,(DE)
* ROM has commands:
|SCREENCOPY,<ram page>,1
copy screen at &c000 to ram page.
numbers can't be 0 or greater than or equal to 6.
PBUFF
PEEK
POKE
SCREENSWAP
BSAVE
* [[Media:MHT_Anta64k3_Rom.zip|MHT Ingenieros ANTA 64K.3 ROM]] (zipped .ROM file)
[[Category:Memory expansions]] [[Category:Peripherals]]
