#garfield Logs

Mar 02 2023

06:46 PM rue_mohr: polprog, wait
06:56 PM rue_mohr: you tftp booted linux onto an arm?
07:44 PM rue_mohr: Tom_L,
07:44 PM rue_mohr: clo
07:44 PM rue_mohr: clog
07:45 PM Tom_L: ?
07:45 PM rue_mohr: how long ago was I checking those sram chips
07:45 PM rue_mohr: to see if they were battery backed up or not?
07:45 PM Tom_L: no idea
07:45 PM Tom_L: got a number?
07:45 PM Tom_L: i can look
07:45 PM rue_mohr: try searching for 512
07:46 PM rue_mohr: http://tom-itx.no-ip.biz:81/~tom-itx/irc/logs/%23garfield/2023-02-09.html
07:46 PM rue_mohr: 11:56 AM ruenahcmohr: IS61C512is not rated for battery backup
07:46 PM rue_mohr: 11:58 AM ruenahcmohr: 5M51008 is rated for battery backup
07:46 PM rue_mohr: 11:59 AM ruenahcmohr: CY7C199L is rated for battery backup
07:46 PM rue_mohr: 12:02 PM ruenahcmohr: W24257 is not rated for battery backup
07:46 PM rue_mohr: 12:02 PM ruenahcmohr: KM62256 is rated for battery backup
07:46 PM rue_mohr: found it!
07:47 PM rue_mohr: thanks tom
07:47 PM Tom_L: Feb 09 14:45:29 <ruenahcmohr> but for what I'm playing with, 512k is as much as I can use
07:47 PM Tom_L: Feb 09 17:23:40 <aandrew> well q=CV, so Q is 6.25 Coloumbs at 2.5V and 5 Coloumbs at 2V. Discharging 1.25 Coloumbs at 100uA should take I=Q/t 1.25/100u or 3.5h if my math is right?
07:48 PM rue_mohr: 5M51008 or CY7C199L or KM62256 for battery backup
07:48 PM rue_mohr: I got 3.3F caps
07:48 PM rue_mohr: oh the last one is only 256k
07:51 PM rue_mohr: wait, that first one isn't 512k either
07:52 PM rue_mohr: arg
07:52 PM rue_mohr: the 199 is only 256k
07:52 PM rue_mohr: ARG
07:59 PM rue_mohr: I must have more 512k chips
07:59 PM rue_mohr: should I use the 1M chip and drop an address line?
08:04 PM rue_mohr: if I make a 512k NVSram, I wont be able to write it, as there isn't one in existance
08:05 PM rue_mohr: DS1245 is a 1M tho
08:07 PM rue_mohr: still waiting for my replacement hard drive
08:08 PM rue_mohr: I still have to send off the network card
08:11 PM Tom_L: all sorts of exchanges
08:12 PM rue_mohr: arg, none of the memory chips I want to use for this are already in kicad
08:12 PM Tom_L: figures
08:13 PM rue_mohr: so, the idea is to make a 512 NV SRAM chip
08:13 PM rue_mohr: so that I can fit the whole address space of a cpu in one memory chip
08:14 PM rue_mohr: its ram, its rom, whatever
08:14 PM rue_mohr: 512 NVSRAM chips dont seem to exist
08:14 PM rue_mohr: which is a problem, because I need to emulate a chip if I'm gonna program it with my tl866
08:14 PM Tom_L: what were these flash chips they used on the botboard 2?
08:15 PM rue_mohr: eeprom?
08:15 PM rue_mohr: I want NVRAM, becasue there are no limits on write cycles
08:15 PM rue_mohr: which means I can use the same chip as rom and ram
08:15 PM rue_mohr: I dont have to care what I put where
08:15 PM rue_mohr: its all ram, its all non-volatile
08:16 PM Tom_L: TC55257APL-10
08:16 PM rue_mohr: *but* one of the snags is, that even when I find chips like the above that can go into low voltage standby, I still need to insert the standby power system
08:17 PM rue_mohr: so I'm kinda making a module anyhow
08:17 PM rue_mohr: I got some ICL7673 to do the backup power switching
08:17 PM Tom_L: static ram
08:17 PM rue_mohr: and the 3.3F caps to be the backup power
08:17 PM rue_mohr: 55257 would be static ram, yup
08:17 PM Tom_L: so what's the difference?
08:18 PM rue_mohr: NV
08:18 PM rue_mohr: non volatile
08:18 PM rue_mohr: you remove the power, and it keeps the contents
08:18 PM Tom_L: damn, i got 3 of these botboards
08:18 PM rue_mohr: so I use it like an eeprom chip
08:18 PM Tom_L: and 2 botboard 2
08:18 PM Tom_L: 6811
08:19 PM Tom_L: and 2 spare chips in a tube
08:19 PM rue_mohr: the 55257 IS rated for backup battery
08:19 PM Tom_L: https://www.alldatasheet.com/datasheet-pdf/pdf/116886/TOSHIBA/TC55257APL-10.html
08:20 PM rue_mohr: 2uA draw at 2V
08:20 PM Tom_L: haha and my io expander board
08:20 PM rue_mohr: :]
08:21 PM Tom_L: so if you ever get an itch for the 6811.. i got plenty
08:22 PM rue_mohr: someone asked me for some that I pulled off some stripdowns
08:22 PM Tom_L: these are new
08:22 PM rue_mohr: yup
08:23 PM rue_mohr: I was just looking for the name, I cant find it
08:23 PM Tom_L: mmm i may have 7
08:23 PM Tom_L: i forgot i still have one in the attic on my lightseeker bot
08:23 PM rue_mohr: it had multiply
08:24 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/lightseeker/lightseeker2.jpg
08:24 PM rue_mohr: I should build one of those as a 'restart' project
08:24 PM Tom_L: cds cells
08:24 PM rue_mohr: I got those.
08:25 PM rue_mohr: spinning mirror and an ADC
08:25 PM Tom_L: i probably have the program here stuffed away somewhere
08:25 PM rue_mohr: :]
08:26 PM Tom_L: although i do recall cleaning house long time back so it may have gone with that
08:26 PM rue_mohr: every so often the brush runs out of paint, and you have to place it back a bit and drag more paint forward
08:26 PM rue_mohr: :(
08:26 PM Tom_L: hdd wise
08:27 PM Tom_L: oooo
08:28 PM rue_mohr: but you dont need to drag as much foward because there is already a bit of paint left behind from the last stroke
08:29 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/lightseeker/bot1.bas
08:31 PM Tom_L: haha
08:33 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/rue/lightseeker/bot1a.bas
08:33 PM Tom_L: revised
08:36 PM Tom_L: i bet if i drug it down and put a 9v battery on it, it would run
08:42 PM rue_mohr: :]
08:43 PM rue_mohr: I dont want rice for supper tonight
08:43 PM rue_mohr: Tom_L, you didn't ahve BASIC for hc11 did you?
08:44 PM rue_mohr: in so many ways that looks like the code for my lawn mower
08:44 PM rue_mohr: its basic too
09:30 PM Tom_L: yes
09:30 PM Tom_L: i forget what it was called
09:31 PM Tom_L: one of the robot club guys wrote it
09:31 PM Tom_L: i still have the pink books too
09:32 PM Tom_L: http://support.technologicalarts.ca/docs/BASIC11/basic11.html
09:32 PM Tom_L: that wasn't it but one i found just now
09:32 PM Tom_L: gwbasic? don't think so
09:33 PM Tom_L: sbasic11 maybe?
09:35 PM Tom_L: got asmhc11
09:35 PM Tom_L: must have been sbasic
09:36 PM Tom_L: https://www.seanet.com/~karllunt/sbasic.htm
09:36 PM Tom_L: yeah it was sbasic
09:36 PM aandrew: heh that's givin me some strong nostalgia but I've never used that
09:37 PM Tom_L: you can still dl it too
09:40 PM aandrew: yep I noticed
09:40 PM aandrew: not basic11 but sbasic
09:40 PM Tom_L: still have all 10? books for the 68332 too
09:40 PM Tom_L: karl lunt wrote it
09:40 PM Tom_L: marvin green did the botboard iirc
09:58 PM Tom_L: https://ia800907.us.archive.org/8/items/bitsavers_motorola68ferenceManualRev3_31028881/1991_M68HC11RM_Reference_Manual_Rev3.pdf
10:01 PM Tom_L: one of them had a debugger built in