And a mini version:
As if it weren’t nerdy enough, the 6502 40th Anniversary Computer Badge runs Lee Davison’s EhBASIC. There are 1024 whole bytes free for your programs, so it’s not exactly spacious. It’s got useful floating point support, though:
Yup, that’s the second most boring BASIC example program, after the quadratic root finder.
100 REM HERON ROOTS 110 EP=0.0001 120 INPUT "X";X 130 N=1:RN=X/2 140 PRINT"COUNT","ROOT","DELTA":PRINT"======","======","======" 150 DE=ABS(RN*RN-X) 160 PRINT N,RN,DE 170 RN=(RN+X/RN)/2 180 N=N+1 190 IF DE>EP THEN GOTO 150
Yes readers, I built one:
All of 2 KB RAM, but the form factor can’t be beat. I’m sure I’ll be the hippest cat on the block when I pair it with my happening 2012 Hamvention lanyard …
I did make some minor mods to the build:
- I socketed the main chips. The 6502 is in 2× cut up 20-pin narrow sockets. Under the EPROM is the 2K×8 SRAM, socketed too. This means that the EPROM is in two stacked sockets and sticks out far too far. But at least it’ll allow me to upgrade the RAM
- I used real pin-header jumpers and links for RAM and EPROM size selection instead of solder links. This meant a horrible kludge for the RAM selector under the SRAM chip involving angled and bent headers, a filed-down chip socket and a hand-knotted wire jumper (artisanal af!)
- Even though there’s no mention of it in the manual, I stuck the battery pack on the back
- One bad mod: the HL-340 RTS mod suggested in the manual is much harder than it looks. I trashed the supplied USB adapter, but I have others …
Next up on the workbench #6502
Instagram filter used: Lo-fi
After being used as a wall-hanging for approximately 20 years, then surviving an intercontinental trip in my luggage, the Synertek SYM-1 is running. I think a few segments of the display are iffy, but it responds to the keyboard and beeps. Next step is to hook up the serial port.
These single boards sure do produce a lot of RFI. Waving the almost exactly ten year old radio near it produces howls and churrs.