原文
Second, slimmer, revision of my LT6502 6502 laptop. This is very much a work in progress.
Specs
- 65C02 running at 14MHz (hopefully)
- 46KByte of user RAM
- EhBASIC 22p2
- eWOZMON
- Compact Flash for storage
- Built in battery (7400mAh currently)
- USB-PD Rechargable
- 10.1" Screen
- nanoSwinSID for sound (as well as beeps)
Features improved on since previous version;
- Better placement of keys
- Use an FFC for the display
- Simpler case
- Battery level indicator (CAPS Lock will flash when getting low)
- USB charge and data on single USB-C connector
- Single PCB for keyboard and logic/processor
Images
2026-04-06 - Graphics Test
2026-04-05 - Text on screen
2026-03-07 - Render of case design in progress
2026-03-21 - Picture of PCB mid assembly
Updates
- 2026-04-06 - Graphics now working
- 2026-04-05 - Text working, eventually scrolling working too
- 2026-03-26 - Migrated away from github to codeberg
- 2026-03-21 - PCB assembly underway (power tests passed)
- 2026-03-07 - Case coming together, currently 31mm in height, vs the 70mm of the previous version)
- 2026-03-01 - PCB sent for manufacture
In progress
- Board assembly
- Glue Logic
To do
- Keyboard/Modem code (needs a change due to using the chip directly and I need to add in serial port driver for Modem)
- Testing, lots of testing.
- Finish the case design and print it.
Memory Map
The memory map is copied from the previous LT6502, with removal of expansion port and addition of Modem and SID
High Level
| Start | End | Size (Dec) | Size (Hex) | What is it | Notes |
|---|---|---|---|---|---|
| 0x0000 | 0xBEAF | 48816 | 0xBEB0 | RAM | This includes Zeropage and other bits BASIC may need (more below) |
| 0xBF00 | 0xBFFF | 512 | 0x200 | peripherals | This is where the peripherals are mapped (see below) |
| 0xC000 | 0xFFFF | 12288 | 0x3000 | ROM | holding EhBASIC, eWoz monitor, bootstrap and vectors |
ROM breakdown
| Start | End | Size (Dec) | Size (Hex) | What is it | Notes |
|---|---|---|---|---|---|
| 0xC000 | 0xFAFF | 15104 | 0x3B0 | EhBASIC | EhBASIC 2.22p5 |
| 0xF000 | 0xF2FF | 768 | 0x300 | eWozMon | Enhanced Wozmon |
| 0xF300 | 0xFFF9 | 3322 | 0xCFA | Bootstrap | startup messages and also input/output/load/save functions |
| 0xFFFA | 0xFFFF | 6 | 0x0A | 6502 Vectors |
RAM breakdown
| Start | End | Size (Dec) | Size (Hex) | What is it | Notes |
|---|---|---|---|---|---|
| 0x0000 | 0x02FF | 768 | 0x300 | RAM | This includes Zeropage and other bits BASIC may need |
| 0x0300 | 0x07FF | 1280 | 0x500 | RAM | This is going to be for the compact flash reading/writing |
| 0x0800 | 0xBDFF | 46592 | 0xB6B0 | ROM | BASIC RAM available |
peripherals
| Address | subAddr range | RW | What is it | Notes |
|---|---|---|---|---|
| 0xBF00 | 00-1F | RW | nanoSwinSID | |
| 0xBF20 | 0-1 | RW | Modem | |
| 0xBF30 | 30-9F | RW | Unused Currently | |
| 0xBFAO | 0-0 | W | Beeper | just write 0xFF and 0x00 to turn on/off the speaker |
| 0xBFBO | 0-7 | RW | Compact Flash | |
| 0xBFCO | 0-F | RW | 65C22 | on board VIA |
| 0xBFDO | 0-F | 0-1 | Display | |
| 0xBFEO | 0-F | RW | Atmega644p | internal keyboard |
| 0xBFF0 | 0-1 | RW | Console | FTDI USB console port |