ANTA 64K Memory Expansion
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.
- Uses port &F8F8 to latch data (read/write)
- Uses memory address to define where in 64KB ram to read/write.
- NOT Dk'Tronics compatible.
- More like a ram disc
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
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:
copy screen at &c000 to ram page.
numbers can't be 0 or greater than or equal to 6.
PBUFF NBUFF PEEK POKE SCREENSWAP BSAVE BLOAD CSAVE CLOAD OPEN GET CLOSE PUT MKILL MCAT MRENAME FREDSK RAMDSK CC
- MHT Ingenieros ANTA 64K.3 ROM (zipped .ROM file)