Difference between revisions of "ANTA 64K Memory Expansion"
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A Spanish manufactured memory expansion intended for the Spanish market. | A Spanish manufactured memory expansion intended for the Spanish market. | ||
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| + | 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. | 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. | Features: peek and poke, Screen flipping, Printer buffer, random access to files. | ||
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<gallery> | <gallery> | ||
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Image:Anta64K3_Top.jpg|Unit front | Image:Anta64K3_Top.jpg|Unit front | ||
Image:Anta64K3_Bottom.jpg|Unit back | Image:Anta64K3_Bottom.jpg|Unit back | ||
Image:Anta64K3_PCB_Top.jpg|PCB top | Image:Anta64K3_PCB_Top.jpg|PCB top | ||
Image:Anta64K3_PCB_Bottom.jpg|PCB bottom | Image:Anta64K3_PCB_Bottom.jpg|PCB bottom | ||
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</gallery> | </gallery> | ||
Latest revision as of 07:06, 15 November 2015
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.
Contents
Advert
Pictures
Unit front
Unit back
PCB top
PCB bottom
Technical
- 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
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
NBUFF
PEEK
POKE
SCREENSWAP
BSAVE
BLOAD
CSAVE
CLOAD
OPEN
GET
CLOSE
PUT
MKILL
MCAT
MRENAME
FREDSK
RAMDSK
CC
ROM
- MHT Ingenieros ANTA 64K.3 ROM (zipped .ROM file)
