MEM TYPE SOURCE HEX DEC USAGE
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ROM Monitor $0000 0 Monitor kernal up to $0FFF
ROM Monitor $0003 3 Allow input of a line of text, store at (DE). Two lines max.
ROM Monitor $0006 6 Carriage return
ROM Monitor $0009 9 Two carriage returns
ROM Monitor $000C 12 Print space at cursor position
ROM Monitor $000F 15 Print TAB at cursor position
ROM Monitor $0012 18 Print display code held in A at cursor position
ROM Monitor $0015 21 Print ASCII message held at (DE) at cursor position
ROM Monitor $0018 24 Print ASCII message held at (DE) at cursor position (inc. control codes)
ROM Monitor $001B 27 Get keypress, store ASCII value in A
ROM Monitor $001E 30 Check for SHIFT + BREAK (Z flag set if so)
ROM Monitor $0021 33 Write header to cassette
ROM Monitor $0024 36 Write data to cassette
ROM Monitor $0027 39 Read header from cassette
ROM Monitor $002A 42 Read data from cassette
ROM Monitor $002D 45 Verify data on cassette
ROM Monitor $0030 48 Play melody as per BASIC 'MUSIC' command, music string held at (DE)
ROM Monitor $0033 51 Set realtime clock. A = 1 or 0 (AM/PM), DE = time in seconds
ROM Monitor $003B 59 Read the realtime clock, results into A & DE
ROM Monitor $003E 62 Cause brief tone to sound
ROM Monitor $0041 65 Set MUSIC tempo (value 1-7)
ROM Monitor $0044 68 Produce tone 2Mhz divide by two-bytes held at $11A1 & $11A2
ROM Monitor $0047 71 Silences above tone
ROM Monitor $03BA 954 Display HL on screen as 4-digit hex number
ROM Monitor $03C3 963 Display A on screen as 2-digit hex number
ROM Monitor $03DA 986 Convert d0-d3 of A into ASCII, stored back in A
ROM Monitor $03F9 1017 Convert ASCII in A to d0-d3 of A
ROM Monitor $0410 1040 Converts string of 4 ASCII characters starting at (DE) to hex, store in HL
ROM Monitor $041F 1055 Converts string of 2 ASCII characters starting at (DE) to hex, store in A
ROM Monitor $09B3 2483 Wait character input from keyboard (flash cursor), store display code in A
ROM Monitor $0BB9 3001 Convert ASCII value stored in A to display code, store back in A
ROM Monitor $0BCE 3022 Convert display code stored in A to ASCII value, store back in A
ROM Monitor $0DA6 3494 Not implemented (meant to be wait for VBlank. Code contains only C9-RET)
ROM Monitor $0DDC 3548 Control the display per code stored in A (clear screen, inverse etc)
ROM Monitor $0FB1 4017 Cursor position control
RAM Monitor Work Area $1000 4096 Monitor work area up to $11F4
RAM Monitor Work Area $1038 4152 Vector for interrupt mode 1 (when Monitor located at $0000)
RAM Monitor Work Area $10F0 4336 File type of the last file used with cassette storage
RAM Monitor Work Area $10F1 4337 17 bytes containing last used filename. Last byte is always $0D
RAM Monitor Work Area $1102 4354 2 bytes containing size of file (LSB then MSB)
RAM Monitor Work Area $1104 4356 2 bytes containing data address of file (LSB then MSB)
RAM Monitor Work Area $1106 4358 2 bytes containing execution address of file (LSB then MSB)
RAM Monitor Work Area $1108 4360 91 bytes for supplemental file information (comments etc)
RAM Monitor Work Area $1171 4465 Y position of cursor
RAM Monitor Work Area $1172 4466 X position of cursor
RAM Monitor Work Area $118E 4494 Current character underneath the cursor
RAM Monitor Work Area $11A3 4515 80 character buffer for line input routine ($0003)
Video RAM - $D000 53248 Top-left corner of 1st page of screen memory
Video RAM - $D027 53287 Top-right corner of 1st page of screen memory
Video RAM - $D3C0 54208 Bottom-left corner of 1st page of screen memory
Video RAM - $D3E7 54247 Bottom-right corner of 1st page of screen memory
Video RAM - $D3E8 54248 Top-left corner of 2nd page of screen memory
Video RAM - $D40F 54287 Top-right corner of 2nd page of screen memory
Video RAM - $D7A8 55208 Bottom-left corner of 2nd page of screen memory
Video RAM - $D7CF 55247 Bottom-right corner of 2nd page of screen memory
Mem Mapped I/O 8255 $E000 57344 Cursor timer reset / Keyboard Scan
Mem Mapped I/O 8255 $E001 57345 Keyboard Data
Mem Mapped I/O 8255 $E002 57346 Various (vertical blank, cursor status, cassette, Vgate, interrupt mask)
Mem Mapped I/O 8255 $E003 57347 Control word for 8255
Mem Mapped I/O 8253 $E004 57348 Counter #0 (clock frequency for music / sound production)
Mem Mapped I/O 8253 $E005 57349 Counter #1 (rate generator : divide 31.5Khz -> 1Hz : output to counter #2)
Mem Mapped I/O 8253 $E006 57350 Counter #2 (initiates interrupt when reached zero)
Mem Mapped I/O 8253 $E007 57351 Control word for 8253
Mem Mapped I/O - $E008 57352 Status of tempo timer / Sound on/off / H-blank
Mem Mapped I/O - $E00C 57356 Swap Monitor from $0000 to $C000
Mem Mapped I/O - $E010 57360 Swap Monitor from $C000 to $0000
Mem Mapped I/O - $E014 57364 Normal mode CRT display
Mem Mapped I/O - $E015 57365 Inverse mode CRT display
Mem Mapped I/O - $E200 57856 Roll display fully up. $E200 to $E2FF move VRAM by 8 character spaces
Mem Mapped I/O - $E27D 57981 Roll display to top of 2nd page of screen memory
USER EPROM 2716 $E800 59392 2 kilobytes EPROM area for user programs, auto-run if first byte is $00
PERIPHERALS - $F000 61440 Boot area for floppy disc unit
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Very helpful! I recently picked up the MZ-80C mini by HAL Laboratory that came out last year, it’s my first time experiencing the MZ-80K line of computers. I found this very helpful for figuring out how to write Z80 assembly code for it.
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