Second Revision of 6502 Laptop

Summary

LT6502b 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 fun...