THE TEST
I set up the logic to pretend that the disk drive goes ready and stays that way for almost two minutes, then drops File Ready status. I instrumented various print statements to watch on the serial terminal (debug console).
I turned on the unit and waited for it to initialize. I then flipped the Load/Unload switch up to the Load position where I saw the code open the virtual 2315 cartridge file and purportedly download the contents to the FPGA to be stored in the SDRAM chip. I displayed the individual bytes being transferred for a specific sector (cylinder 10, head 1, sector 2).
After the time limit expired, I expected to see the Ready light go out but the box remain loaded until I flipped the Load/Unload switch down to Unload. At that time, it should rewrite the cartridge image file on SDcard with the contents of SDRAM as pulled up from the FPGA. After that completed it would return to its idle condition until a cartridge image was loaded again.
ANOMALIES I OBSERVED
First, during the entire time that the image was loaded, the SEEK lamp remained lit. In my design this should only flicker when a seek is requested by the IBM 1130 controller. However, lamp was originally labeled On Cylinder in the RK-05 code; because the FPGA side is still running the original code, that might explain the lamp. Otherwise, the FPGA is continually executing seeks.
Second, when the time limit expired and the File Ready lamp extinguished, I immediately saw the unit rewriting the cartridge image back to SDcard although the Load/Unload switch remained in the Load position. Something is not working as I expected here.
Third and most serious, the bytes printed for loading SDRAM don't match the bytes printed when retrieving the data from SDRAM. Initially it appeared that the test failed, but I did see that the exact same stream of bytes is returned on every rewrite, even with power cycling between tests. This means that the data is consistently written and read back but somehow I am not displaying it correctly.
FIXES FOR MOST ANOMALIES AND RETEST
I ignored the Seek lamp since in a few days I will be running with my version of the FPGA code, when this becomes worth chasing.
I found code I inherited from the original RK-05 Emulator code where the Pico treated the Load/Unload switch as being in Unload while in the run state RLST10 - the normal running condition. Instead, I need to see the actual value since my code will drop ready but wait before writing back until the Load/Unload switch is physically manipulated.
I altered my instrumentation to display the sector at Cylinder 10, Head 1 Sector 2 in a way that should be consistent on both load and unload.
The retest went much better. I did indeed see the same data consistently, both when downloading it to the FPGA/SDRAM and when uploading it from there as the virtual cartridge was unloaded. The state machine did wait for me to manually flip the Load/Unload switch to Unload, exactly as it should.
This first log output is the startup of the Virtual 2315 Cartridge Facility, before I switch to Load.
This log output below shows the loading of the virtual cartridge image from when I switch to Load until the process is complete. It includes a dump of the bytes for Cylinder 10, Head 1, Sector 2 as a means of validating the ability to move data into and out of SDRAM.
Switch toggled from UNLOAD to LOAD
Drive_Address = 0, RLST1, 1, 0
Card present, microSD card detected
DISPLAY STATUS: "microSD", "detected"
Drive_Address = 0, RLST2, 1, 0
filesystem started
DISPLAY STATUS: "filesystem", "started"
Drive_Address = 0, RLST4, 1, 0
file_open_read_disk_image
sd_spi_go_low_frequency: Actual frequency: 398089
V2-Version Card
R3/R7: 0x1aa
R3/R7: 0xff8000
R3/R7: 0xc0ff8000
Card Initialized: High Capacity Card
SD card initialized
SDHC/SDXC Card: hc_c_size: 121811
Sectors: 124735488
Capacity: 60906 MB
sd_spi_go_high_frequency: Actual frequency: 12500000
Disk image file is open
DISPLAY STATUS: "image file", "is open"
Drive_Address = 0, RLST5, 1, 0
Reading image file header
Reading header from file '2315.dsk'
controller = 1130 internal disk controller
bitRate = 720000
numberOfCylinders = 203
numberOfSectorsPerTrack = 8
numberOfHeads = 2
microsecondsPerSector = 10000
Image file header read successfully
Reading disk image data from file
DISPLAY STATUS: "Reading", "image data"
Drive_Address = 0, RLST7, 1, 0
Reading disk data from file '2315.dsk'
1130 internal disk controller
cylinders=203, heads=2, sectors=8
cylindercount = 0
DISPLAY STATUS: "Read card", " Cyl 0"
DISPLAY STATUS: "Read card", " Cyl 10"
address for c10 h1 s2 is ac00
loading for sector c10 h1 s2
00
5661 246d 0000 78c0 f34c 207c 5865 807a 2469 22c1
0018 01e0 2990 294c 187c 5890 1c48 2090 1b48 2090
1a48 2090 1948 2090 1848 2090 174c 187a 7090 154c
207a 586c 007c 6f70 1b65 807a 61c1 0018 02e0 0cd0
0175 0000 0070 dd00 00f8 003c 00dc 0030 00fc 0030
0008 0001 ff00 0b7c 0008 0000 0000 0000 0010 10d4
007c 6fd0 fbd4 007c f969 0167 0000 00c3 0048 0473
0118 01e0 ed90 2e4c 207a b7c3 0190 2b4c 207a b7c3
0290 284c 207a b773 01c3 0390 294c 187a b790 214c
207a 94c0 00d0 2170 f590 1c4c 207a 99d0 1c70 f090
184c 207a 89c0 174c 207a 89c3 0490 154c 187a a690
0f48 2070 e3c0 89e8 8a4c 207a b762 324c 007b 4718
00ae 24c5 17ff ef00 1000 0e02 0000 0000 1ee8 0071
01c1 0048 1070 0271 0170 fb94 007c fb48 2070 06c0
ab4c 207c fc71 014c 007a 3ec1 0090 a14c 187a cc70
efc0 a24c 187a d569 9ec0 9d94 007c 624c 187b 4671
ffc1 0048 0870 fc6d 007c 6210 1062 05d6 007c 6872
ff70 fc62 05d6 007b 2072 ff70 fcd4 007d 2a71 01d0
40d4 007d 2bd4 007c 6844 007d 2d94 007b 16d0 224c
187b 714c 087a fa90 1f4c 087b 2bc0 264c 207b 01c0
1790 194c 187b 78c0 204c 207b 08c0 1090 134c 187b
7ec0 1a4c 187b 89c0 0990 0d4c 187b 1390 0b4c 207b
8968 11d0 0f70 d900 0000 3000 09ff dbff d5ff de00
1200 6400 c000 0100 0500 0000 0000 0000 0000 0000
0000 0000 0a00 00a0 0800 00c0 f64c 207b 3868 f6c0
e544 007d 63c0 ee4c 187a ee74 017b d670 b6c0 eda0
ed10 9080 d9d0 e910 10d0 e4c0 e690 db4c 107b 4674
017b 2070 a862 176a e065 807a 61c1 0018 02e4 007a
6984 007a 61d0 0166 0000 00c4 007a 2590 fcd0 0167
0000 0073 01c1 00e0 c2e8 ccd1 00f0 bf4c 047b 6480
bdd1 0071 01c0 c3d1 01c2 00d1 0272 0171 0173 ff70
fa71 016d 007a 254c 007a 58c0 b04c 207b 38c0 b04c
20
cylindercount = 20
DISPLAY STATUS: "Read card", " Cyl 20"
DISPLAY STATUS: "Read card", " Cyl 30"
cylindercount = 40
DISPLAY STATUS: "Read card", " Cyl 40"
DISPLAY STATUS: "Read card", " Cyl 50"
cylindercount = 60
DISPLAY STATUS: "Read card", " Cyl 60"
DISPLAY STATUS: "Read card", " Cyl 70"
cylindercount = 80
DISPLAY STATUS: "Read card", " Cyl 80"
DISPLAY STATUS: "Read card", " Cyl 90"
cylindercount = 100
DISPLAY STATUS: "Read card", " Cyl 100"
DISPLAY STATUS: "Read card", " Cyl 110"
cylindercount = 120
DISPLAY STATUS: "Read card", " Cyl 120"
DISPLAY STATUS: "Read card", " Cyl 130"
cylindercount = 140
DISPLAY STATUS: "Read card", " Cyl 140"
DISPLAY STATUS: "Read card", " Cyl 150"
cylindercount = 160
DISPLAY STATUS: "Read card", " Cyl 160"
DISPLAY STATUS: "Read card", " Cyl 170"
cylindercount = 180
DISPLAY STATUS: "Read card", " Cyl 180"
DISPLAY STATUS: "Read card", " Cyl 190"
cylindercount = 200
DISPLAY STATUS: "Read card", " Cyl 200"
Disk image data read successfully
DISPLAY STATUS: "Image data", "read OK"
Drive_Address = 0, RLST8, 1, 0
Disk image data read, file closed successfully
The final log output shows the process of rewriting the cartridge data to the virtual cartridge file after I switched to Unload until the write is complete.
Requested unloadDrive_Address = 0, RLST11, 0, 0file_open_write_disk_imagesd_spi_go_low_frequency: Actual frequency: 398089V2-Version CardR3/R7: 0x1aaR3/R7: 0x40ff8000R3/R7: 0xc0ff8000Card Initialized: High Capacity CardSD card initializedSDHC/SDXC Card: hc_c_size: 121811Sectors: 124735488Capacity: 60906 MBsd_spi_go_high_frequency: Actual frequency: 12500000finished file open for write, code 0Disk image file is openDISPLAY STATUS: "Image file", "open"Drive_Address = 0, RLST12, 0, 0Writing header to file '2315.dsk'Disk image header writtenDISPLAY STATUS: "Writing", "image data"Drive_Address = 0, RLST13, 0, 0Writing disk image data to file '2315.dsk':cylinders=203, heads=2, sectors=8cylindercount = 0DISPLAY STATUS: "Write card", "Cyl 0"DISPLAY STATUS: "Write card", "Cyl 10"retrieval address for c10 h1 s2 is ac00fetching for sector c10 h1 s2005661 246d 0000 78c0 f34c 207c 5865 807a 2469 22c10018 01e0 2990 294c 187c 5890 1c48 2090 1b48 20901a48 2090 1948 2090 1848 2090 174c 187a 7090 154c207a 586c 007c 6f70 1b65 807a 61c1 0018 02e0 0cd00175 0000 0070 dd00 00f8 003c 00dc 0030 00fc 00300008 0001 ff00 0b7c 0008 0000 0000 0000 0010 10d4007c 6fd0 fbd4 007c f969 0167 0000 00c3 0048 04730118 01e0 ed90 2e4c 207a b7c3 0190 2b4c 207a b7c30290 284c 207a b773 01c3 0390 294c 187a b790 214c207a 94c0 00d0 2170 f590 1c4c 207a 99d0 1c70 f090184c 207a 89c0 174c 207a 89c3 0490 154c 187a a6900f48 2070 e3c0 89e8 8a4c 207a b762 324c 007b 471800ae 24c5 17ff ef00 1000 0e02 0000 0000 1ee8 007101c1 0048 1070 0271 0170 fb94 007c fb48 2070 06c0ab4c 207c fc71 014c 007a 3ec1 0090 a14c 187a cc70efc0 a24c 187a d569 9ec0 9d94 007c 624c 187b 4671ffc1 0048 0870 fc6d 007c 6210 1062 05d6 007c 6872ff70 fc62 05d6 007b 2072 ff70 fcd4 007d 2a71 01d040d4 007d 2bd4 007c 6844 007d 2d94 007b 16d0 224c187b 714c 087a fa90 1f4c 087b 2bc0 264c 207b 01c01790 194c 187b 78c0 204c 207b 08c0 1090 134c 187b7ec0 1a4c 187b 89c0 0990 0d4c 187b 1390 0b4c 207b8968 11d0 0f70 d900 0000 3000 09ff dbff d5ff de001200 6400 c000 0100 0500 0000 0000 0000 0000 00000000 0000 0a00 00a0 0800 00c0 f64c 207b 3868 f6c0e544 007d 63c0 ee4c 187a ee74 017b d670 b6c0 eda0ed10 9080 d9d0 e910 10d0 e4c0 e690 db4c 107b 4674017b 2070 a862 176a e065 807a 61c1 0018 02e4 007a6984 007a 61d0 0166 0000 00c4 007a 2590 fcd0 01670000 0073 01c1 00e0 c2e8 ccd1 00f0 bf4c 047b 6480bdd1 0071 01c0 c3d1 01c2 00d1 0272 0171 0173 ff70fa71 016d 007a 254c 007a 58c0 b04c 207b 38c0 b04c20 cylindercount = 20DISPLAY STATUS: "Write card", "Cyl 20"DISPLAY STATUS: "Write card", "Cyl 30"cylindercount = 40DISPLAY STATUS: "Write card", "Cyl 40"DISPLAY STATUS: "Write card", "Cyl 50"cylindercount = 60DISPLAY STATUS: "Write card", "Cyl 60"DISPLAY STATUS: "Write card", "Cyl 70"cylindercount = 80DISPLAY STATUS: "Write card", "Cyl 80"DISPLAY STATUS: "Write card", "Cyl 90"cylindercount = 100DISPLAY STATUS: "Write card", "Cyl 100"DISPLAY STATUS: "Write card", "Cyl 110"cylindercount = 120DISPLAY STATUS: "Write card", "Cyl 120"DISPLAY STATUS: "Write card", "Cyl 130"cylindercount = 140DISPLAY STATUS: "Write card", "Cyl 140"DISPLAY STATUS: "Write card", "Cyl 150"cylindercount = 160DISPLAY STATUS: "Write card", "Cyl 160"DISPLAY STATUS: "Write card", "Cyl 170"cylindercount = 180DISPLAY STATUS: "Write card", "Cyl 180"DISPLAY STATUS: "Write card", "Cyl 190"cylindercount = 200DISPLAY STATUS: "Write card", "Cyl 200"Disk image data writtenDrive_Address = 0, RLST14, 0, 0Disk image data write, file closed successfully
WAITING FOR MY FPGA PROGRAMMER TO ARRIVE IN THE MAIL
Ebay and other sites are awash with clones from China for the Lattice programmer, but either have the usual delays waiting for overseas transport or they came with a healthy 'scalper' premium from sellers who kept them in the US. Further, others who offered them locally didn't ship particularly promptly as it appears they order from China to fulfill.
I stepped up and purchased from Lattice directly - at a considerable premium over the clones - which was to be fulfilled by Mouser. I paid for two day UPS shipment when I ordered it on Saturday, but the order wasn't marked as shipped until today (Tuesday) and UPS states it is not yet in their possession.
Thus best case is Thursday delivery but that is only if Mouser hands it over to UPS before their cutoff today, otherwise my 2 day order will arrive Friday or later. If I wasn't eager to debug further with functions that require my code in the FPGA, it wouldn't be worthy of mention.
I will program the FGPA once I have the gear in hand and run through more checks to verify how it interacts with the Pico code. I am getting much closer to testing with a real hookup to the IBM 1130 and its 13SD internal disk drive.
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