Difference between revisions of "ANTA 64K Memory Expansion"

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A 64KB memory expansion by [[MHT Ingenieros]].
 
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 ==
 
== Pictures ==
  
 
<gallery>
 
<gallery>
 +
 
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
 +
 
</gallery>
 
</gallery>
  
 
== Technical ==
 
== Technical ==
  
−
* Uses port &F8F8, &FADD and centronics strobe.
+
* Uses port &F8F8 to latch data (read/write)
−
* Data is read one byte at a time using &F8F8
+
* Uses memory address to define where in 64KB ram to read/write.
−
* Data is written one byte at a time using &F8F8.
+
 
* NOT Dk'Tronics compatible.
 
* NOT Dk'Tronics compatible.
 
* More like a ram disc
 
* 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:
 
* 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
 
PBUFF
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PEEK
 
PEEK
 
POKE
 
POKE
−
SCREENCOPY
 
 
SCREENSWAP
 
SCREENSWAP
 
BSAVE
 
BSAVE
Line 44: Line 87:
  
 
* [[Media:MHT_Anta64k3_Rom.zip|MHT Ingenieros ANTA 64K.3 ROM]] (zipped .ROM file)
 
* [[Media:MHT_Anta64k3_Rom.zip|MHT Ingenieros ANTA 64K.3 ROM]] (zipped .ROM file)
 +
 +
[[Category:Memory expansions]] [[Category:Peripherals]]

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.

ANTA64K-advert.jpg

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

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