What is the current status of the 2SIO? Do you still want me to mail you mine or is Geoff modifying it for 2 RS-232 serial ports?
The other undocumented chip is the MUSIC ROM. Just examine and run at the address of the ROM. It will load the listing byte for byte (from the newsletter) into memory starting at 0000 and begin playing.
I will send the VTL-2 manual to Geoff and Tom.
Here are instructions for the advanced monitor:
;
; Hardware Debug Monitor for 8080/8085/Z80 processor family
;
; This simple monitor requires NO RAM of any sort. You can use it to
; poke around the system as long as the CPU, a ROM and the UART are
; working. (Hint: if the UART is not working, you can use the polling
; by HDM80 to track down its accessing and debug it).
;
; This monitor provides basic read/modify memory, as well as
; Loop Read/Write functions (useful when hardware debugging).
;
; Commands (must be UPPER-CASE):
; Mxxxx - Display memory at specified address
; Displays one line, enter SPACE for another, RETURN to stop
; Exxxx - Edit memory at specified address
; Prompts with location, enter two digit HEX value, then
; SPACE to proceed to next or RETURN to stop
; Gxxxx - Go (Begin Execution) at specified address
; Rxxxx - Perform Loop-Read at specified address (RESET to stop)
; Wxxxx dd - Perform Loop-Write dd -> specified address (RESET to stop)
;
; Build with DDS XASM tools:
; MACRO HDM80.MAC >HDM80.ASM
; ASM85 HDM80 -t
;
; Dave Dunfield - Aug 4, 2007
; Grant Stockly - Nov 22, 2007 - Modified for 2SIO at 0,1
; GETC modified
; PUTC modified
; HINT modified
;
;
cStat EQU $10 (020) 2SIO Status Register
cData EQU $11 (021) 2SIO Data Register
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