ANTA 64K Memory Expansion: Difference between revisions
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A 64KB memory expansion by [[MHT Ingenieros]]. | A 64KB memory expansion by [[MHT Ingenieros]]. | ||
[[Image:ANTA64K-advert.jpg]] | |||
== Pictures == | == Pictures == | ||
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* [[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]] | |||
Revision as of 13:59, 5 November 2015
A 64KB memory expansion by MHT Ingenieros.
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Pictures
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Unit front
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Unit back
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PCB top
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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)