Nascom 2 JavaScript emulator 0.2a

Screen Size type keys here: - limited crib: O A AA T 1000 1010 1000 EF 48 45 4C 4C 4F 20 57 oHELLO W 1008 4F 52 4C 44 20 00 DF 5B ORLD ._[ E1000 M 0BCA 0BCA 20 ,H,E,L,L,O, ,W,O,R,L,D , , ,! 0BD8 20 NAS-SYS3 crib:- #C7 START Reset computer #CF RIN Obtain an input character in the A register. #DF 5B MRET - return to NAS-SYS #DF 5D TDEL - wait for a second. #E7 BRKPT store and display registers & return to NAS-SYS3 #EF 48 00 PRS print nul terminated string #F7 ROUT output character in A register P S 1000 1000 4802 1001 0048 0000 0031 0000 0031 0000 0031 FF00 FEF1 00 0000 0000 1000 4802 1002 DA00 0000 0031 0000 0031 0000 0031 FFFF 31E0 00 0000 0000 Crib Size

Reset NMI Clear memory and reset Save state TAPE: HALT: Start Keys of Kraal Load NAS: Load from tape: Save to tape: Load Intel Hex: RELOAD E1000 Docs: NAS-SYS 3 NASCOM assembler package (Nap clear copy To Clipboard Use cmds "X32", "T 0 100 0 0 1" to output to IO and "N" reset. Copy output to a text file with .nas extension so it can be reloaded. PORT 0xA:

Notes:

Use cmds "X32", "T 0 100 0 0 1" to output to Tape and "N" reset. Copy output in Tape to a text file with .nas extension. It can be reloaded.

If tape led is on convert from binary to hex, so W and T commands are okay.

Help needed (2013-12-18)

• Need modal switch between game mode and text mode.

  Game mode is the current implementation where the focus is on accurately simulating the physical keys. As Nascoms keyboard have a different layout from modern keyboards, we get akwardness with keys like :/; where on Nascom we have :/* and ;/+ keys.

  In text-mode you will get a 1-1 mapping between keys pressed and the character represented, but it may change the status of the shift key (which breaks games that depend on shift as a key in itself).

• Prettier UI
• Persistent state (almost there)
• Smarter loading (auto determine the load kind needed)
• Implement saving.
• Much better Z80 implementation (asm.js aware for bonus points).

Updates (2022-11-16)