Difference between revisions of "Transtape"

Revision as of 09:48, 6 December 2013

A Spanish Hacking Device from HM (Hard Micro, S.A.).

Transtape

Please add more info here....

Technical

• Uses a 16KB ROM paged into memory at &0000.
• Uses a 8KB static RAM paged into memory at &c000.
• ROM is paged into the range &0000-&3fff when the red button is pressed and the NMI vector is executed.
• Black button pages their ROM into the range &0000-&3fff and executes it at &0000. This checks the ROM version, and clears the extra ram if a CPC6128 BASIC ROM is found.

0000 f3        di                               ;; disable maskable interrupts
0001 0100df    ld      bc,0df00h		;; select upper rom 0
0004 ed49      out     (c),c
0006 01817f    ld      bc,7f81h			;; enable upper rom (mode 1 too)
0009 ed49      out     (c),c
000b 31febf    ld      sp,0bffeh                ;; setup stack which is not initialised after reset

000e 3a02c0    ld      a,(0c002h)               ;; read BASIC ROM version number
0011 fe02      cp      02h                      ;; CPC6128?
0013 cc2e0c    call    z,0c2eh		        ;; erase extra RAM

;; this appears to set it up for a reset..
0016 210000    ld      hl,0000h
0019 e5        push    hl			
001a e5        push    hl
001b c30038    jp      3800h                    ;; I think the hardware monitors for address 3800h and if found disables the ROM

• Uses NMI
• When a write happens to their RAM it appears to write through to the RAM behind??
• Menu code is at offset &3810 and is copied into RAM at &A200.
• Uses port FBF0 (output), FBFF (input). Don't know the exact functions yet.

writing 0 to fbf0 disables it's internal rom.

Pictures

• Hard Micro's Transtape
• 

  Front

• 

  Back

• 

  PCB Top

• 

  PCB Bottom

Manual

• Transtape Manual (pdf) (spanish)

Downloads

• Transtape Rom dump (zipped rom file)

Weblinks

Some info can be found here (French)