Comments (4)
A 80x25 textbuffer would most likely fit in the dram in the nosdk variant. Can the charmap be put in iram you think?
from cpm8266.
Using IRAM: You betcha!
Hmm... there's two ways you can go.
(1) graphic charmap (store line-of-text-at-a-time-by-buffer) and use compressed line text. (uses about 1kB for the text (includes extended charset))
(2) store only the text buffer, and no graphic buffer. Looking at the code a little more, looks like it'd be best to use 6px wide x 8px high chars. Which I just realize only uses 1kB!
A few questions:
(1) Would you want to use the extended charset?
(2) How much extra IRAM do you have?
(3) Do you want me to code it as a VT100 interface?
(4) Do you want to do NTSC broadcast? or NTSC composite cable?
(5) Is your I2S engine totally free? Keep in mind it operates on the RX pin :(
from cpm8266.
- Nah, I recon that the 96 characters from regular 7-bit ascii would be enough for a cp/m machine
- will check a bit later, it's 2 am here now ;-)
- that'd be nice if you already got the engine for vt100/102 decoding available. As far as I remember VT102 implements insert/delete character on a line which is really convenient to have.
- I guess composite cable got much better image quality?
- I'm not using the I2S at all. But if it's using the RX pin then it might be a showstopper unless I can go over to a softuart. Is the video-engine using any interrupts that would fsck up a softuart implementation?
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It would use interrupts that would make a softuart untenable. I wonder if there is any other options for alternate mapping. Just looked, even if you use a PS/2 keyboard you can't bitbang it. May be able to use the SPI bus, or UART1 I'll look into it.
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Related Issues (20)
- Add way to set wifi credentials
- Tidy up disk images HOT 1
- Wifi-mode is much slower than the nosdk-mode
- Backport changes to nosdk8266 HOT 2
- `xxd` is in `vim-common` and some `esptool.py` quirks HOT 6
- Turn on LED when disk buffer is dirty
- master/code/dist/readme.txt ... some bagatelles. HOT 2
- Disk buffer doesn't flush when at CP/M prompt
- Add short commit id to version number?
- Any reason why this wouldn't work mostly as is (w/ wifi & 64k & disks) on ESP32
- Version requirements for esp-open-sdk? HOT 2
- conflict in headers HOT 4
- problem uploading - solved HOT 4
- uncomplete make HOT 8
- Error 2 on while make of esp-open-sdk HOT 2
- Pre-Compiled WiFi enabled binary.
- update/patch packet for non-transfering XMODEM v2.4 on M: prebuilt-binary
- In wifi the N/O disk is empty
- Remove the initial crud when connecting via telnet
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