"Components" menu about drom

[tobiasvl]

comes with 1K RAM (0x400)
dream invaders: 2k ram required (0x800)
dröm has 4k, EA dec 1980: 0x1000
j.r. expansion kit came with 4K RAM, room for 8K RAM (0x2000) or 7K RAM (0x1C00) with EPROM

RAM is mirrored across 0000-0x3FFF (16K)

dream eprom 0xC000-0xC3FF (1K) - contains CHIPOS / CHIPOSLO
dreamsoft 2 eprom 0xC000-0xC7FF (2K) - replaces CHIPOS
j.r. expansion kit eprom 0x1C00-0x23ff (2K) (e.g. dreamsoft 1)

dreamer #7 expansion kit: ram 0x0000-0x17FF (6K), eprom 0x1800-0x1FFF (2K) (e.g. dreamsoft 1)

dream pia a (keypad) 8010-8011
dream pia b (speaker/tape) 8012-8013
j.r. pia 1 8020-8023
j.r. pia 2 8040-8043

dreamer (newletter, graeme & garry)
dreamsoft (graham & graeme)
dreamware (michael j. bauer)
dreamcards

0000 - 1FFF: 8K RAM

0000 - 17FF: 6K RAM (dreamer #7 expansion kit)
1800 - 1FFF: EPROM (Dreamsoft 1) (dreamer #7 expansion kit)

0000 - 1BFF: 7K RAM (JR Expansion kit)
1C00 - 23FF: EPROM (Dreamsoft 1) (JR Expansion kit)

2000/2400 - 3FFF: mirror
4000 - 8000: also mirror???

8010 - 8013: PIA
8020 - 8023: PIA (JR)
8040 - 8043: PIA (JR)

C000 - C3FF: EPROM (CHIPOS/CHIPOSLO)
C000 - C7FF: EPROM (Dreamsoft 2) - are the last 8 bytes mirrors of C3F8-C3FF? check ROM

Dreamsoft 2:

Dreamsoft 2 is an alternative OS which replaces CHIPOS and adds routines that make it easier to write CHIP-8 programs.

When Dreamsoft 2 starts up, it will prompt for an address. Like with CHIPOS, type a 4-digit hexadecimal number to enter a memory address.

It will then display the byte at the current address, as well as the next byte in memory (suitable for viewing CHIP-8 instructions, which are two bytes long).

0: old MEMOD
1: Tape load, same as CHIPOS
2: Tape dump, same as CHIPOS
3: Execute program at current address
4: Advance current address
5: Decrement current address
6: Disassemble CHIP-8 instruction at current address
7: Jump to 1C00 (Dreamsoft 1)
FN: New MEMOD